CN110649229B - Electrode plate of slurry battery and slurry battery - Google Patents
Electrode plate of slurry battery and slurry battery Download PDFInfo
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- CN110649229B CN110649229B CN201810672693.7A CN201810672693A CN110649229B CN 110649229 B CN110649229 B CN 110649229B CN 201810672693 A CN201810672693 A CN 201810672693A CN 110649229 B CN110649229 B CN 110649229B
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- current collector
- surface current
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- elastic frame
- conductive
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- 230000001070 adhesive effect Effects 0.000 claims description 2
- 150000001336 alkenes Chemical class 0.000 claims description 2
- 239000012943 hotmelt Substances 0.000 claims description 2
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 2
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 2
- 229920002312 polyamide-imide Polymers 0.000 claims description 2
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- 238000004804 winding Methods 0.000 claims description 2
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- 238000004519 manufacturing process Methods 0.000 abstract description 10
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- 239000004020 conductor Substances 0.000 description 17
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- 239000000203 mixture Substances 0.000 description 13
- 239000003273 ketjen black Substances 0.000 description 10
- 239000002033 PVDF binder Substances 0.000 description 9
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 9
- 239000006258 conductive agent Substances 0.000 description 7
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 7
- 239000011267 electrode slurry Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
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- 239000007924 injection Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
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- 230000004048 modification Effects 0.000 description 3
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- 239000007774 positive electrode material Substances 0.000 description 3
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- 239000000243 solution Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- QTHKJEYUQSLYTH-UHFFFAOYSA-N [Co]=O.[Ni].[Li] Chemical compound [Co]=O.[Ni].[Li] QTHKJEYUQSLYTH-UHFFFAOYSA-N 0.000 description 1
- FDLZQPXZHIFURF-UHFFFAOYSA-N [O-2].[Ti+4].[Li+] Chemical compound [O-2].[Ti+4].[Li+] FDLZQPXZHIFURF-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000011246 composite particle Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- JVZGJLAPJLXQKT-UHFFFAOYSA-N lithium iron(2+) manganese(2+) nickel(2+) oxygen(2-) Chemical compound [O-2].[Fe+2].[Mn+2].[Li+].[Ni+2] JVZGJLAPJLXQKT-UHFFFAOYSA-N 0.000 description 1
- 229910002102 lithium manganese oxide Inorganic materials 0.000 description 1
- FRMOHNDAXZZWQI-UHFFFAOYSA-N lithium manganese(2+) nickel(2+) oxygen(2-) Chemical compound [O-2].[Mn+2].[Ni+2].[Li+] FRMOHNDAXZZWQI-UHFFFAOYSA-N 0.000 description 1
- ILXAVRFGLBYNEJ-UHFFFAOYSA-K lithium;manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[O-]P([O-])([O-])=O ILXAVRFGLBYNEJ-UHFFFAOYSA-K 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
- VLXXBCXTUVRROQ-UHFFFAOYSA-N lithium;oxido-oxo-(oxomanganiooxy)manganese Chemical compound [Li+].[O-][Mn](=O)O[Mn]=O VLXXBCXTUVRROQ-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000006262 metallic foam Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/368—Liquid depolarisers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Cell Electrode Carriers And Collectors (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides an electrode plate of a slurry battery and the slurry battery, wherein the electrode plate comprises a porous or reticular upper surface current collector, a lower surface current collector and an electrode layer which is stacked between the upper surface current collector and the lower surface current collector, and the electrode layer contains electrode active conductive particles; and sewing threads for fixedly connecting the upper surface current collector and the lower surface current collector to block electrode active conductive particles in the electrode layer from passing through are sewn on the circumferential direction of the upper surface current collector and the lower surface current collector. The electrode plate disclosed by the invention is subjected to edge sealing in a sewing mode, so that the production line production is facilitated, the manufacturing process of the electrode plate is simplified, and the sealing safety of the electrode plate is improved.
Description
Technical Field
The invention relates to the field of batteries, in particular to an electrode plate of a slurry battery and the slurry battery.
Background
The electrode plate of the slurry battery is internally provided with slurry electrode materials. The electrode material in the slurry state is a conductive slurry formed by suspending or precipitating conductive particles in an electrolyte according to a certain proportion. When the slurry battery is subjected to external impact or vibration, the conductive particles are not bonded and fixed, so that the slurry battery can move in the electrolyte to form a dynamic conductive network. The conductive particles may contain only a conductive agent, or may be composite particles of an active material and a conductive agent. Since the electrode tabs of the paste battery contain non-adhesively fixed conductive particles inside, the peripheries of the electrode tabs of the paste battery must be sealed to prevent the conductive particles from leaking outside.
At present, the edge of an electrode plate of a slurry battery is generally sealed by adopting hot melting, glue bonding, mechanical welding and other modes. The existing sealing mode has complex process, is not easy to disassemble when the battery is recycled and regenerated, and the sealing part is easy to damage or crack after being soaked in electrolyte for a long time, so that the reliability can not be ensured.
Disclosure of Invention
The invention aims to provide an electrode plate of a slurry battery, which is subjected to edge sealing in a sewing mode so as to simplify the manufacturing process of the electrode plate and facilitate the production of a production line.
According to an aspect of the present invention, there is provided an electrode sheet for a slurry battery, the electrode sheet including a porous or mesh-shaped upper surface current collector, a lower surface current collector, and an electrode layer stacked between the upper and lower surface current collectors. The electrode layer contains electrode active conductive particles, and sewing threads for fixedly connecting the upper surface current collector and the lower surface current collector so as to block the electrode active conductive particles in the electrode layer from passing through are sewn on the circumferential direction of the upper surface current collector and the lower surface current collector.
The electrode active conductive particles may be positive electrode active conductive particles, or may be negative electrode lithium-embeddable conductive particles. The non-adhesively secured positive electrode active conductive particles and/or the non-adhesively secured negative electrode intercalatable lithium conductive particles are capable of moving in the electrolyte to form a positive electrode slurry and/or a negative electrode slurry, respectively. The mass ratio of the positive electrode active conductive particles to the positive electrode slurry may be 10% to 90%, preferably 15% to 80%, and the mass ratio of the negative electrode lithium embeddable conductive particles to the negative electrode slurry may be 10% to 90%, preferably 15% to 80%. The average particle size of the positive active conductive particles can be 0.05-500 mu m, and the mass ratio of the positive active material to the conductive agent can be 20-98: 80-2; the average particle size of the negative electrode lithium-embeddable conductive particles can be 0.05-500 mu m, and the mass ratio of the negative electrode lithium-embeddable material to the conductive agent can be 20-98: 80-2.
Therefore, after the upper surface current collector and the lower surface current collector are sewn by the sewing thread, the positive active conductive particles in the positive slurry can be blocked, or the negative electrode in the negative slurry can be inserted with the lithium conductive particles to pass through, but the penetration of the electrolyte is not blocked. The positive electrode active conductive particles are a mixture of a positive electrode active material and a conductive agent, and the negative electrode lithium-embeddable conductive particles are a mixture of a negative electrode active material and a conductive agent.
The positive active material is one or a mixture of more of lithium-containing lithium iron phosphate, lithium manganese phosphate, doped lithium manganese oxide, lithium cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt oxide, lithium nickel manganese iron oxide and other lithium-containing metal oxides.
The negative active material is metallic lithium, or one or a mixture of more of aluminum-based alloy, silicon-based alloy, tin-based alloy, lithium titanium oxide and carbon material which can be reversibly intercalated with lithium.
The conductive agent is one or a mixture of more of carbon black, carbon fiber, Ketjen black, graphene and metal particles.
Preferably, the electrode sheet further comprises an elastic frame for sewing together the upper surface current collector and the lower surface current collector. The sewing thread is inserted into the upper surface current collector, the lower surface current collector and the elastic frame to fixedly connect the upper surface current collector and the lower surface current collector in a flat seam or an overlock manner. In order to enable ions in the electrolyte to migrate between the positive and negative electrode layers, the upper surface current collector and the lower surface current collector are preferably porous foils or mesh-shaped current collectors. When the electrode plate is prepared, the current collectors on the upper surface and the lower surface can be closely sewed together along the edge of the electrode material around the circumference so as to prevent the leakage of electrode active conductive particles and prevent the permeation of electrolyte. The electrode plate disclosed by the invention is subjected to edge sealing in a sewing mode, the process is simple, the sewing thread cannot be damaged after being soaked in the electrolyte for a long time, and the sealing reliability is ensured.
By combining the sewing thread and the elastic frame, on one hand, the sealing property of the electrode plate can be improved; on the other hand, the current collector can be protected from being damaged by the traction of the sewing thread. Wherein the sewing track is one or more of a straight line, a broken line or a curve. When the cross section of the electrode sheet is rectangular, the sewing pattern may be formed as a straight line or a wavy line along four sides of the rectangle.
Preferably, the elastic frame is tightly pressed and sewn between the upper surface current collector and the lower surface current collector; or, the elastic frames are paired and aligned with each other to press and sew the outer sides of the upper and lower surface current collectors.
The current collectors on the upper surface and the lower surface can be in a rectangular structure, and the elastic frame can be in a rectangular closed strip-shaped structure or a rectangular semi-closed strip-shaped structure with an opening. The elastic frame has a certain width. Thus, the elastic frame can be vertically aligned with the current collectors on the upper surface and the lower surface and is closely sewed together. When the elastic frame is tightly pressed and sewn between the upper surface current collector and the lower surface current collector, a cavity for accommodating an electrode material can be formed among the upper surface current collector, the lower surface current collector and the elastic frame. When the elastic frames are paired and pressed tightly outside the upper and lower surface current collectors in alignment with each other, a cavity for accommodating an electrode material can be formed between the upper and lower surface current collectors.
Preferably, the elastic frame is made of electrolyte-resistant porous foam or rubber, or the elastic frame is made of electrolyte-resistant flexible porous material by rolling. The porous foam is polyolefin foam, carbonized or non-carbonized melamine foam or conductive polyolefin foam, etc. The rubber is ethylene propylene rubber or fluorine rubber. The flexible porous material is polyester non-woven fabric or polypropylene non-woven fabric. Therefore, the elastic frame is beneficial to the electrolyte to infiltrate and soak the pole piece from the side edge.
Preferably, the sewing thread is a conductive cable or a non-conductive cable, the conductive cable is one or more of metal, metal with a conductive coating attached to the surface or an electronic conductive film coated on the surface, a composite material formed by twisting organic fibers and conductive fibers and winding the conductive fibers on the surface of the organic fibers, and the like. The non-conductive cable is organic fiber, and the organic fiber is one or more of polyester fiber, nylon fiber, natural cotton and hemp, aramid fiber, polypropylene, polyethylene, fluorine fiber yarn and the like.
When the metal cable is used for the positive electrode sheet, it is required to be resistant to oxidation reaction, and a specific material may be one of aluminum, aluminum alloy, stainless steel, silver, tin, titanium, or the like, and preferably aluminum. When the metal cable is used for the negative electrode sheet, the metal cable is required to be resistant to reduction reaction, and the specific material may be one of copper, stainless steel, nickel, titanium, tin-plated copper, nickel-plated copper, silver-plated copper, and the like, and preferably is nickel-plated stainless steel. The conductive coating may be a conductive carbon material coating or a metal coating, preferably a conductive carbon material coating. The organic fiber comprises polyester fiber, nylon fiber, natural cotton and hemp, aramid fiber, polypropylene, polyethylene, fluorine fiber yarn and other organic fibers with good electrolyte resistance. The conductive fibers may be carbon fibers or conductive metal fibers, or the like. The electron conducting film may be a conductive carbon material coating or a metal coating.
Preferably, when the electrode sheet is an electrode sheet of an electrolyte injection type lithium slurry battery, the electrode layer is a coating body or powder with a predetermined thickness and size, which is arranged between the upper surface current collector and the lower surface current collector. The elastic frame is a closed frame which surrounds the periphery of the electrode layer and is tightly pressed and sewn between the upper surface current collector and the lower surface current collector. The thickness of the elastic frame is larger than that of the coating body or the powder.
Preferably, when the electrode tab is an electrode tab of a slip-casting lithium slurry battery, the electrode layer is formed of slurry having fluidity. The elastic frame is a semi-closed frame, and the elastic frame and the current collectors on the upper surface and the lower surface form an opening allowing slurry to be injected together. Therefore, the current collector and the elastic frame can be sewn together to form a semi-finished product, and then electrode slurry is injected into the semi-finished product to manufacture the electrode plate.
Preferably, when the current collector is used for the positive plate, the material of the current collector is one or more of aluminum, alloy aluminum, stainless steel, silver, tin, titanium and the like which are resistant to oxidation reaction; when the current collector is used for the negative plate, the material of the current collector is one or more of copper, stainless steel, nickel, titanium, tin-plated copper, nickel-plated copper, silver-plated copper and the like which are resistant to reduction reaction.
The current collector can be a metal net with meshes in a square shape, a diamond shape, a rectangular shape or a polygonal shape; or, a porous metal foam having a porous structure; or a metal plate (metal foil) that is mechanically stamped or chemically etched to allow ions to pass through or permeate. The current collector is preferably aluminum when used in the positive electrode; when the current collector is used for the negative electrode, nickel-plated stainless steel is preferable.
Preferably, the electrode plate further comprises a leakage-proof material arranged at the edges of the elastic frame and the current collectors on the upper and lower surfaces to prevent the leakage of the electrode layer material, wherein the leakage-proof material is one or more of hot-melt polyethylene, polypropylene, modified olefin adhesive, polyamide and polyimide insulating tape. According to another aspect of the present invention, there is also provided a slurry battery, which includes a battery casing and a battery cell disposed in the battery casing, wherein the battery cell includes a plurality of positive electrode sheets/separators/negative electrode sheets alternately stacked, and the positive electrode sheets and the negative electrode sheets are the above-mentioned electrode sheets.
The invention has the advantages that: (1) the peripheral edge of the electrode plate of the slurry battery is sealed by adopting a sewing thread sewing method, so that the protection and sealing of the edge of the electrode plate can be completed at one time, and the production process is simplified. (2) The equipment investment cost required in the sewing process is low, the process is mature, and the method is favorable for the streamlined production. (3) The combination of sewing thread and elasticity frame can be sealed around the electrode piece better on the one hand, and on the other hand is favorable to it to be disassembled at the in-process of battery recovery regeneration.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
fig. 1 is a schematic structural view of an electrode tab of a slurry battery according to an embodiment of the present invention;
fig. 2 is a schematic structural view of an electrode tab of a slurry battery according to another embodiment of the present invention;
FIG. 3 is a cross-sectional view of FIG. 2;
fig. 4 is a schematic structural view of an electrode tab of the slip-casting type slurry battery of the present invention.
Description of reference numerals:
100-electrode plate of slurry battery, 101-upper surface current collector, 102-lower surface current collector, 103-electrode layer, 104-elastic frame, 105-sewing thread, 1041-opening.
In the drawings, like parts are provided with like reference numerals. The drawings are not to scale.
Detailed Description
The invention will be further explained by embodiments in conjunction with the drawings.
As shown in fig. 1 to 3, the present invention provides an electrode tab 100 of a paste battery. The electrode sheet 100 includes a porous or mesh-shaped upper surface current collector 101, a lower surface current collector 102, and an electrode layer 103 stacked between the upper and lower surface current collectors. The electrode layer contains electrode active conductive particles. Sewing threads 105 for fixedly connecting the upper and lower surface current collectors to block passage of electrode active conductive particles in the electrode layer 103 are sewn in the circumferential direction of the upper and lower surface current collectors.
In a specific embodiment of the present invention, when the electrode sheet 100 is a positive electrode sheet, the upper surface current collector 101 and the lower surface current collector 102 both use rectangular aluminum mesh or aluminum foil with holes, and when the electrode sheet 100 is a negative electrode sheet, the upper surface current collector 101 and the lower surface current collector 102 both use rectangular copper mesh or copper foil with holes.
The electrode layer 103 may be a positive electrode layer or a negative electrode layer. When the electrode layer is a positive electrode layer, it includes a positive active conductive material, which may be a mixture of lithium iron phosphate, ketjen black, and PVDF. When the electrode layer is a negative electrode layer, it includes a negative active conductive material, which may be a mixture of graphite, ketjen black, and PVDF.
The sewing thread 105 may be a nylon thread.
In order to protect the current collectors from being damaged by being pulled by the sewing threads, the electrode sheet further comprises an elastic frame 104 for sewing the upper and lower surface current collectors together. The sewing thread 105 is inserted through the upper and lower surface current collectors and the elastic frame 104 to sew the upper and lower surface current collectors flat (fig. 1) or to wrap the upper and lower surface current collectors (fig. 2 and 3). When the current collectors on the upper and lower surfaces are both rectangular structures, the elastic frame is a rectangular closed or semi-closed frame.
In addition, during sewing, the elastic frame 104 and the current collector are in a compression state. The elastic frame 104 is tightly pressed and sewn between the upper surface current collector and the lower surface current collector; or, the current collectors are tightly sewed outside the upper and lower surface current collectors in pairs and aligned with each other.
The electrode plate edge-sealed by adopting the sewing mode is preferably used for the lithium paste battery.
According to different preparation processes of lithium slurry batteries, the lithium slurry batteries can be divided into a liquid injection type and a slip casting type.
When the electrode tab is an electrode tab of an electrolyte-type lithium slurry battery, the electrode layer 103 is a coating body or powder having a predetermined thickness and size provided between the upper and lower surface current collectors. The elastic frame 104 is a closed frame which surrounds the periphery of the electrode layer 103 and is tightly sewn between the upper and lower surface current collectors. Specifically, the positive electrode active conductive material of the liquid-injection type battery is a mixture of lithium iron phosphate, ketjen black and PVDF in a mass ratio of 85:13: 2. The negative electrode active conductive material is a mixture of graphite, ketjen black and PVDF in a mass ratio of 90:5: 5. The predetermined thickness of the coated body or powder (after compaction) is 0.5-1.5 mm.
When the electrode tab is an electrode tab of a slip-casting lithium paste battery, the electrode layer 103 is formed of a slurry having fluidity. The flexible bezel 104 is a semi-enclosed bezel. The elastic frame 104 and the upper and lower surface current collectors are jointly formed with openings 1041 for allowing slurry to be injected. Specifically, as shown in fig. 4, an opening 1041 is formed on the elastic frame 104. The positive electrode active conductive material is a mixture of lithium iron phosphate, Ketjen black and PVDF, wherein the mass ratio of the lithium iron phosphate to the Ketjen black is 85:13: 2. The negative electrode active conductive material is a mixture of graphite, ketjen black and PVDF in a mass ratio of 90:5: 5. Wherein, the preparation proportion of the anode active conductive material or the cathode active conductive material and the electrolyte is 10-60%.
The following examples 1 to 5 illustrate the production of positive and negative electrode sheets for liquid-injected lithium-slurry batteries and slip-cast lithium-slurry batteries.
Example 1
This example is a method for preparing positive electrode plate of liquid-injected lithium slurry battery. The preparation method comprises the following steps:
step one, weighing a positive electrode active conductive material (a mixture of lithium iron phosphate, Keqin black and PVDF in a mass ratio of 85:13: 2) with a preset mass, and coating the positive electrode active conductive material on a lower surface current collector (a rectangular aluminum net with the size, the length, the width and the thickness of 170mm multiplied by 140mm multiplied by 0.15 mm). The positive electrode active conductive material was coated on a rectangular coating body (electrode layer) having a thickness of 160mm × 130mm × 1.5 mm.
And secondly, attaching an elastic frame made of PET material with the length, width and thickness of 170mm multiplied by 140mm multiplied by 5mm to the lower surface current collector to surround the edge of the electrode layer. And compressing the elastic frame and primarily fixing the lower surface current collector and the elastic frame by using a bonding or sewing method. The thickness of the elastic frame after compression is 2mm, which is slightly higher than the thickness of the electrode layer by 1.5 mm.
And step three, covering the upper surface current collector with the same size as the lower surface current collector, namely, a rectangular aluminum net with the length, width and thickness of 170mm multiplied by 140mm multiplied by 0.15mm on the electrode layer and the elastic frame, and fixing the upper surface current collector by using a flat pressing, rolling, bonding or sewing method.
And fourthly, taking a nylon thread with the diameter of 0.12-0.5mm as a sewing thread, penetrating the elastic frame by adopting a flat sewing or overlock (overlock) method, sewing the peripheral edges of the current collectors on the upper surface and the lower surface, and fixedly connecting the elastic frame with the current collectors to obtain the positive electrode plate.
Example 2
This example is another method for preparing positive electrode plate of liquid-injected lithium slurry battery. This example is substantially the same as example 1, except that the positive electrode active conductive material is disposed on the lower surface current collector in a non-coating manner. Specifically, a powdered positive electrode active conductive material (lithium iron phosphate: ketjen black: PVDF in a mass ratio of 85:13: 2) is tableted, a block with a length and width of 160mm × 130mm × 1.5mm is placed on the lower surface current collector, and then an elastic frame is attached to the lower surface current collector to surround the edge of the positive electrode active conductive material, so as to prepare a positive electrode piece.
Example 3
The embodiment is a preparation method of a negative pole piece of an injection type lithium slurry battery. This example is substantially the same as example 1 or example 2, except that the electrode material is changed from a positive electrode active conductive material to a negative electrode active conductive material. Specifically, the negative active conductive material is graphite in a mass ratio of 90:5: ketjen black: a mixture of PVDF.
Example 4
The embodiment is a preparation method of a positive electrode plate and a negative electrode plate of a slip casting type lithium slurry battery. The method comprises the following steps:
firstly, preliminarily fixing three layers of current collectors (rectangular aluminum nets or copper nets with the length, width and thickness of 170mm multiplied by 140mm multiplied by 0.15 mm) by sandwiching a layer of elastic frame (square frame made of PET material with the length, width and thickness of 170mm multiplied by 140mm multiplied by 5 mm) by using flat pressing, rolling, bonding or sewing methods.
And step two, coating the outer sides of the edges of the two current collectors and the elastic frame layer with a leakage-proof material (PET non-woven fabric), sewing four edges by adopting a flat sewing or overlock (overlock) method, and leaving an opening without sewing.
And step three, injecting the electrode slurry into the cavity from the reserved opening, and sewing the reserved opening.
Example 5
The invention is another preparation process of the positive and negative pole pieces of the slip casting type lithium slurry battery. This embodiment is substantially the same as embodiment 4 except that the elastic frame and the current collector are disposed in a different manner. Specifically, in this embodiment, two current collectors (rectangular aluminum mesh or copper mesh with a length and width of 170mm × 140mm × 0.15 mm) are vertically aligned between two elastic frames (square frame made of PET with a length and width of 170mm × 140mm × 5 mm), and the two current collectors are preliminarily fixed by flat pressing, rolling, bonding or sewing.
The specific embodiments of the present invention are not intended to be limiting of the invention. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (9)
1. The electrode plate of the slurry battery is characterized by comprising a porous or reticular upper surface current collector, a lower surface current collector and an electrode layer which is stacked between the upper surface current collector and the lower surface current collector, wherein the electrode layer contains electrode active conductive particles; sewing threads for fixedly connecting the upper surface current collector and the lower surface current collector to block electrode active conductive particles in the electrode layer from passing through are sewn on the circumferential direction of the upper surface current collector and the lower surface current collector, and the electrode plate further comprises an elastic frame which is sewn with the upper surface current collector and the lower surface current collector together; the sewing thread penetrates through the upper surface current collector, the lower surface current collector and the elastic frame to be fixedly connected with the upper surface current collector and the lower surface current collector in a flat seam or an overlock mode.
2. The electrode sheet of claim 1, wherein the elastic frame is compression-sewn between the upper and lower surface current collectors; alternatively, the elastic frames are press-sewn in pairs and aligned with each other on the outer sides of the upper and lower surface current collectors.
3. The electrode sheet according to claim 1, wherein the elastic frame is made of porous foam, rubber, or flexible porous material, which is resistant to electrolyte; wherein the porous foam is one of polyolefin foam, conductive polyolefin foam and carbonized or non-carbonized melamine foam; the rubber is ethylene propylene rubber or fluorine rubber; the flexible porous material is polyester non-woven fabric or polypropylene non-woven fabric.
4. The electrode sheet according to claim 1, wherein the sewing thread is a conductive cable or a non-conductive cable, and the conductive cable is one or more of metal, metal with a conductive coating or an electronic conductive film coated on the surface, a composite material formed by twisting organic fibers and conductive fibers, and a composite material formed by winding conductive fibers on the surface of the organic fibers; the non-conductive cable is made of organic fibers, and the organic fibers are one or more of polyester fibers, nylon fibers, natural cotton and hemp, aramid fibers, polypropylene, polyethylene and fluorine fiber yarns.
5. The electrode sheet according to any one of claims 1 to 4, wherein when the electrode sheet is an electrode sheet of an infusion-type lithium slurry battery, the electrode layer is a coating body or powder having a predetermined thickness and size provided between the upper surface current collector and the lower surface current collector; the elastic frame is around the periphery of electrode layer and compress tightly the sewing and be in closed frame between upper surface mass flow body and the lower surface mass flow body.
6. The electrode tab according to claim 2, wherein when the electrode tab is an electrode tab of a slip-casting lithium slurry battery, the electrode layer is formed of slurry having fluidity; the elastic frame is a semi-closed frame, and the elastic frame and the upper surface current collector and the lower surface current collector jointly form an opening allowing the slurry to be injected.
7. The electrode sheet according to claim 1, wherein the upper surface current collector and the lower surface current collector are one or more of aluminum, aluminum alloy, stainless steel, silver, tin and titanium which are resistant to oxidation reaction when used in a positive electrode sheet; and when the upper surface current collector and the lower surface current collector are used for the negative plate, the upper surface current collector and the lower surface current collector are one or more of copper, stainless steel, nickel, titanium, tin-plated copper, nickel-plated copper and silver-plated copper which are resistant to reduction reaction.
8. The electrode sheet according to claim 1, further comprising a leakage-proof material disposed at the edges of the elastic frame, the upper surface current collector and the lower surface current collector to prevent leakage of the electrode material, wherein the leakage-proof material is one or more of hot-melt polyethylene, polypropylene, modified olefin adhesive, polyamide and polyimide insulating tape.
9. A paste battery, comprising a battery case and a battery cell disposed in the battery case, wherein the battery cell comprises a plurality of positive electrode sheets/separators/negative electrode sheets alternately stacked, and wherein the positive electrode sheets and the negative electrode sheets are the electrode sheets according to any one of claims 1 to 8.
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