JP5944853B2 - Lithium ion secondary battery electrode sheet manufacturing apparatus and lithium ion secondary battery electrode sheet manufacturing method - Google Patents

Description

  The present invention relates to a lithium ion secondary battery electrode sheet manufacturing apparatus for manufacturing a lithium ion secondary battery electrode sheet by compression molding powder containing an electrode active material and the like, and manufacturing of a lithium ion secondary battery electrode sheet It is about the method.

  The demand for lithium-ion secondary batteries that are small, lightweight, have high energy density, and can be repeatedly charged and discharged is expected to increase in the future from the environmental viewpoint. Lithium ion secondary batteries have a high energy density and are used in the fields of mobile phones and laptop computers. However, with the expansion and development of applications, further improvements in performance, such as lower resistance and higher capacity, have been achieved. It has been demanded.

  Lithium ion secondary battery electrode can be obtained as an electrode sheet, for example, powder rolling using a powder rolling device to produce a rolled sheet such as an electrode sheet from a powder containing an electrode active material Has been done. In a powder rolling device, a rolled sheet is obtained by continuously compression-molding powder supplied between a pair of press rolls on a substrate. Here, when manufacturing a rolled sheet, it is required to manufacture a highly accurate rolled sheet that is a thin film and has little variation in density distribution and film thickness distribution.

  For example, in Patent Document 1, by providing one press roll of a pair of press rolls above the other press roll, the powder film falls off or collapses from the outer peripheral surface of the press roll. A powder rolling apparatus that prevents this is disclosed.

JP 2009-149960 A

  However, in this powder rolling apparatus, since the apparatus is manufactured based on the inherent spatula angle, the arrangement of the constituent members of the apparatus is fixed. Therefore, in order to control the basis weight of the powder on the substrate, control by changing the temperature and control by changing the rotation speed of the pair of rolls can be considered. The response to the change in the basis weight was poor, and changing the rotation speed of the roll had an effect on the production capacity.

  An object of the present invention is to provide a lithium ion secondary battery electrode sheet manufacturing apparatus and a lithium ion secondary battery electrode sheet capable of easily controlling the basis weight of powder on a substrate by simple and effective means. It is to provide a manufacturing method.

  As a result of intensive studies, the inventors have found that the above object can be achieved by adopting a configuration in which the position where one press roll is provided can be changed with respect to the position where the other press roll is provided. The headline and the present invention were completed.

That is, according to the present invention,
(1) It has a pair of press rolls in which the rotation axes are arranged in parallel, and the electrode composition layer is formed on the base material by compressing the powder onto the base material with the pair of press rolls. In this case, the angle θ formed between the rolling part through which the powder passes between the pair of press rolls and the passage direction of the powder between the pair of press rolls and the direction of gravity is 0 ° <θ. <A lithium ion secondary battery electrode sheet | seat characterized by including the drive part which moves the position of the at least one press roll of the said pair of press rolls so that it may become a predetermined angle of the range of <90 degrees. Manufacturing equipment,
(2) A measurement unit that measures the basis weight of the powder with respect to the base material when compression molding is performed by the rolling unit, and a control unit that drives the drive unit based on a measurement result by the measurement unit (1) The lithium ion secondary battery electrode sheet manufacturing apparatus according to (1),
(3) The drive unit moves one press roll of the pair of press rolls above the other press roll, and the lithium ion according to (1) or (2) Manufacturing apparatus for secondary battery electrode sheet,
(4) The apparatus for manufacturing a sheet for a lithium ion secondary battery electrode according to (1) or (2), wherein the driving unit tilts a frame that supports the pair of press rolls.
(5) The lithium ion according to any one of (1) to (4), wherein the powder is a composite particle obtained by granulating a component including an electrode active material and a binder. Manufacturing apparatus for secondary battery electrode sheet,
(6) It has a pair of press rolls in which the rotation axes are arranged in parallel, and the electrode composition layer is formed on the base material by compressing the powder onto the base material by the pair of press rolls. A rolling step of forming the electrode composition layer on the base material using a rolling device in which the powder passes between the pair of press rolls, and the base material in the rolling step. Based on the measurement step of measuring the basis weight of the powder and the measurement result of the measurement step, the angle θ between the passage direction of the powder and the gravity direction between the pair of press rolls is 0 ° <θ < And a driving step of moving at least one of the pair of press rolls so as to have a predetermined angle in a range of 90 °. A method for producing a sheet for a lithium ion secondary battery electrode ,
(7) The driving step includes a step of moving one press roll of the pair of press rolls above the other press roll. Manufacturing method of secondary battery electrode sheet,
(8) The method for producing a sheet for a lithium ion secondary battery electrode according to (6), wherein the driving step includes a step of inclining a frame that supports the pair of press rolls.
(9) The lithium ion according to any one of (6) to (8), wherein the powder is a composite particle obtained by granulating a component including an electrode active material and a binder. A method for producing a secondary battery electrode sheet is provided.

  According to the lithium ion secondary battery electrode sheet manufacturing apparatus and the lithium ion secondary battery electrode sheet manufacturing method according to the present invention, the basis weight of the powder on the substrate can be easily controlled.

It is a figure which shows the outline of the powder rolling apparatus which concerns on embodiment of this invention. It is a figure which shows the position of the roll of the powder rolling apparatus which concerns on embodiment of this invention. It is a figure which shows the position of the roll of the powder rolling apparatus which concerns on other embodiment of this invention.

  Hereinafter, a manufacturing apparatus for a lithium ion secondary battery electrode sheet and a method for manufacturing a lithium ion secondary battery electrode sheet according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an outline of a powder rolling apparatus which is a manufacturing apparatus for a lithium ion secondary battery electrode sheet according to an embodiment. As shown in FIG. 1, the powder rolling apparatus 2 includes a pair of rolls 4A and 4B in which rotating shafts 14A and 14B are arranged horizontally and in parallel in the initial state, and the position of the roll 4B is relative to the position of the roll 4A. Press roll 4 configured to be movable, a film thickness detection sensor 8 for measuring the thickness of a rolled sheet 6 compression-molded by the press roll 4, a control unit 10 for controlling the entire apparatus, and a rolled sheet to be obtained 6, the operation unit 12 that receives an input of a target film thickness of the sheet-like molded product 28 and an instruction to start production of the rolled sheet 6, and the rolls 4 </ b> A and 4 </ b> B of the press roll 4 are respectively rotated by the rotary shaft 14 </ b> A and the rotary shaft of the roll 4 </ b> B. Rotation drive units 16A and 16B having motors that rotate around 14B, and a roll position moving unit 1 having a motor that moves the position of the roll 4B along the guide 18. It is equipped with a.

  Here, the rolls 4A and 4B of the press roll 4 are respectively rotated in the direction of the arrow shown in FIG. The powder 20 is compressed on one surface of the backup base material 22 to form a sheet-like molded product 28. In addition, the rotation driving units 16A and 16B usually rotate the roll 4A and the roll 4B at the same speed.

  The roll position moving unit 19 is in an initial state, that is, an angle formed by the passing direction H of the powder 20 and the gravity direction G when the powder 20 passes between the rolls 4A and 4B of the pressing roll 4 shown in FIG. From the state where θ is 0 ° (the state where the roll 4B is in the position indicated by the dotted line in FIG. 2), the roll 4B is moved so that the angle θ becomes a predetermined angle in the range of 0 ° ≦ θ ≦ 90 °. Here, the gravity direction is the downward direction of FIGS. 1 and 2, and the passing direction is a direction orthogonal to the plane 24 including the rotation shaft 14A of the roll 4A and the rotation shaft 14B of the roll 4B.

  In the present embodiment, as shown in FIG. 2, the position of the roll 4B indicated by the solid line is the position of the roll 4B indicated by the dotted line in FIG. 2 (θ = 0 °) and the roll indicated by the alternate long and short dash line in FIG. A description will be given of a case where movement between the position 4B (θ = 90 °) is possible as indicated by an arrow.

  Further, the film thickness detection sensor 8 can be a pinching type, a contact type or the like, and the detection method is laser type, X-ray type, infrared type, beta ray type, overcurrent type, electromagnetic type, ultrasonic wave. Formula, optical type, etc. can be used.

Next, a procedure for manufacturing the rolled sheet 6 by the powder rolling device 2 will be described. When the input and production start instruction rolled sheet 6 of the target thickness T _D of the sheet-like molding 28 of the rolled sheet 6 via the operation unit 12 is performed, the control unit 10 controls the roll position moving unit 19 rolls 4B to move from the initial state to a position corresponding to the target thickness T _D. The relationship between the angle θ between the passing direction H of the powder 20 and the gravity direction G and the film thickness of the obtained sheet-like molded product 28 of the rolled sheet 6 is measured in advance and stored in the control unit 10. The relationship between the basis weight and the film thickness of the powder 20 that is compression-molded on the backup base material 22 by the press roll 4 is also stored in the control unit 10 in advance.

  Next, when the compression molding of the powder 20 is started by rotating the rolls 4A and 4B of the press roll 4 in the direction of the arrow shown in FIG. 1, the storage tank is stored in the space formed by the press roll 4 and the partition plate 26. The finished powder 20 is bitten into the press roll 4 and is compression-molded on one surface of the backup base material 22. That is, the rolled sheet 6 in which the sheet-like molded product 28 is laminated on the backup base material 22 is obtained.

  When the compression molding of the powder 20 is started, the control unit 10 receives a signal indicating the measurement result of the thickness of the rolled sheet 6 output from the film thickness detection sensor 8.

Next, the control unit 10 compares the target film thickness T _D input via the operation unit 12 with the film thickness T _A of the sheet-like molded product 28 obtained based on the output from the film thickness detection sensor 8. The angle θ formed by the passing direction H of the powder 20 and the gravity direction G is controlled by driving the roll position moving unit 19 and moving the position of the roll 4B. Here, as the angle θ (0 ° ≦ θ ≦ 90 °) between the passing direction of the powder 20 and the gravitational direction increases, the amount of biting of the powder 20 can be reduced and the rolled sheet 6 is formed. The film thickness of the sheet-like molded product 28 can be reduced.

Therefore, when the film thickness T _A of the sheet-like molded product 28 is smaller than the target film thickness T _D , the control unit 10 controls the drive source of the roll position moving unit 19 to pass the powder 20. The position of the roll 4B is moved so that the angle θ formed by H and the gravity direction G becomes small. On the other hand, when the film thickness T _A of the sheet-like molded product 28 is thicker than the target film thickness T _D , the control unit 10 controls the drive source of the roll position moving unit 19 to pass the powder 20. The position of the roll 4B is moved so that the angle θ formed by H and the gravity direction G is increased. When the target film thickness T _D and the film thickness T _A of the sheet-like molded product 28 coincide with each other, the control unit 10 controls the driving source of the roll position moving unit 19 and the passing direction H of the powder 20. The angle θ formed by the gravity direction G is not changed.

  Here, the distance between the roll nip point (the point at which the gap between the pair of rolls becomes the narrowest) and the P point (the point where the peripheral speed of the roll near the roll nip point and the moving speed of the powder are the same) is 20 Otherwise, mottled patterns and streaks occur due to the flow and aggregation of the powder during molding. Further, the basis weight, that is, the basis weight of the powder 20 with respect to the backup base material 22 is determined by the distance between the roll nip point and the point P.

  When the rotation speed of the roll is constant, the distance between the roll nip point and the point P is shortened by making the angle θ formed by the passing direction of the powder 20 and the gravity direction greater than 0 °. Therefore, the capacity between the point P and the roll nip point can be reduced by increasing the angle θ between the passing direction of the powder 20 and the gravity direction, and the rolling sheet 6 (sheet-like molded product 28) can be formed. At this time, the sheet-like molded product 28 of the rolled sheet 6 can be made into a thin film in a state where the flow and aggregation of the powder are suppressed.

  The backup substrate 22 may be a thin film substrate, and usually has a thickness of 1 μm to 1000 μm, preferably 5 μm to 100 μm. As the backup substrate 22, metal foil or carbon such as aluminum, platinum, nickel, tantalum, titanium, stainless steel, copper, and other alloys, conductive polymer, paper, natural fiber, polymer fiber, fabric, polymer Resin film etc. are mentioned, It can select suitably according to the objective. Examples of the polymer resin film include polyester resin films such as polyethylene terephthalate and polyethylene naphthalate, plastic films and sheets including polyimide, polypropylene, polyphenylene sulfide, polyvinyl chloride, aramid film, PEN, PEEK, and the like. It is done.

  Among these, when manufacturing the sheet | seat for lithium ion secondary battery electrodes as the rolled sheet 6, metal foil, carbon, and a conductive polymer can be used as the backup base material 22, and metal is used suitably. Used. Among these, it is preferable to use copper, aluminum, or an aluminum alloy in terms of conductivity and voltage resistance.

  In addition, the surface of the backup base material 22 may be subjected to processing such as coating film processing, drilling processing, buff processing, sand blast processing, and / or etching processing. A base material in which an adhesive or the like is applied to the backup base material surface is particularly preferable because the sheet-like molded product 28 can be firmly held.

  Examples of the powder 20 stored in the space formed by the press roll 4 and the partition plate 26 include composite particles containing an electrode active material. The composite particles include an electrode active material and a binder, and may include other dispersants, conductive materials, and additives as necessary.

  When the composite particles are used as an electrode material for a lithium ion secondary battery, examples of the positive electrode active material include metal oxides capable of reversibly doping and dedoping lithium ions. Examples of the metal oxide include lithium cobaltate, lithium nickelate, lithium manganate, and lithium iron phosphate. In addition, the positive electrode active material illustrated above may be used independently according to a use, and may be used in mixture of multiple types.

  Note that the active material of the negative electrode as the counter electrode of the positive electrode for lithium ion secondary batteries includes low-crystalline carbon (amorphous carbon) such as graphitizable carbon, non-graphitizable carbon, pyrolytic carbon, graphite ( Natural graphite, artificial graphite), alloy materials such as tin and silicon, oxides such as silicon oxide, tin oxide, and lithium titanate. In addition, the electrode active material illustrated above may be used independently according to a use, and may be used in mixture of multiple types.

  The shape of the electrode active material for a lithium ion secondary battery electrode is preferably a granulated particle. When the shape of the particles is spherical, a higher density electrode can be formed during electrode molding.

  The volume average particle diameter of the electrode active material for a lithium ion secondary battery electrode is usually 0.1 to 100 μm, preferably 0.5 to 50 μm, more preferably 0.8 to 30 μm for both the positive electrode and the negative electrode.

  The binder used for the composite particles is not particularly limited as long as it is a compound capable of binding the electrode active materials to each other. A suitable binder is a dispersion type binder having a property of being dispersed in a solvent. Examples of the dispersion-type binder include high molecular compounds such as silicon polymers, fluorine-containing polymers, conjugated diene polymers, acrylate polymers, polyimides, polyamides, polyurethanes, and preferably fluorine-containing polymers. Polymers, conjugated diene polymers and acrylate polymers, more preferably conjugated diene polymers and acrylate polymers.

  The shape of the dispersion-type binder is not particularly limited, but is preferably particulate. By being particulate, the binding property is good, and it is possible to suppress deterioration of the capacity of the manufactured electrode and deterioration due to repeated charge and discharge. Examples of the particulate binder include those in which the particles of the binder such as latex are dispersed in water, and particulates obtained by drying such a dispersion.

  The amount of the binder is sufficient with respect to 100 parts by weight of the electrode active material from the viewpoint of ensuring sufficient adhesion between the obtained electrode active material layer and the current collector and reducing the internal resistance. The amount is usually 0.1 to 50 parts by weight, preferably 0.5 to 20 parts by weight, more preferably 1 to 15 parts by weight based on the dry weight.

  As described above, a dispersant may be used for the composite particles as necessary. Specific examples of the dispersant include cellulose polymers such as carboxymethyl cellulose and methyl cellulose, and ammonium salts or alkali metal salts thereof, polyvinyl alcohol, and the like. These dispersants can be used alone or in combination of two or more.

  As described above, a conductive material may be used for the composite particles as necessary. Specific examples of the conductive material include conductive carbon black such as furnace black, acetylene black, and ketjen black (registered trademark of Akzo Nobel Chemicals Bethloten Fennaut Shap). Among these, acetylene black and ketjen black are preferable. These conductive materials can be used alone or in combination of two or more.

  The composite particles are obtained by granulating using an electrode active material, a binder, and other components such as the conductive material added as necessary, and include at least an electrode active material and a binder, Each of the above does not exist as an independent particle, but forms one particle by two or more components including an electrode active material and a binder as constituent components. Specifically, a plurality of (more preferably several to several tens) electrode active materials are formed by combining a plurality of the individual particles of the two or more components to form secondary particles. It is preferable that the particles are bound to form particles.

  The production method of the composite particles is not particularly limited, and can be produced by a known granulation method such as a fluidized bed granulation method, a spray drying granulation method, or a rolling bed granulation method.

  The volume average particle diameter of the composite particles is usually in the range of 0.1 to 1000 μm, preferably 1 to 500 μm, more preferably 30 to 250 μm, from the viewpoint of easily obtaining an electrode active material layer having a desired thickness.

  The average particle size of the composite particles is a volume average particle size calculated by measuring with a laser diffraction particle size distribution measuring apparatus (for example, SALD-3100; manufactured by Shimadzu Corporation).

  According to the lithium ion secondary battery electrode sheet manufacturing apparatus and the lithium ion secondary battery electrode sheet manufacturing method according to the present embodiment, a simple and effective means for controlling the basis weight of the powder on the base material Can be easily performed. In addition, by increasing the angle θ formed by the powder passage direction and the gravitational direction when the powder passes between a pair of press rolls, the powder is formed when forming a lithium ion secondary battery electrode sheet. The effect of gravity on the film can be reduced, and a sheet weight electrode sheet, that is, a thin film electrode sheet can be produced.

  Further, based on the measurement result of the film thickness of the obtained rolled sheet, feedback control is performed to control the angle θ formed by the powder passing direction and the gravity direction when the powder passes between the pair of press rolls. Therefore, an electrode sheet having a desired thickness can be produced.

  In the above-described embodiment, the roll position moving unit 19 is used to move the position of the roll 4B. However, as shown in FIG. It is good also as a structure which moves the position of the roll 4B by making it incline. In other words, the press roll 4 is supported by the frame 30 and includes a frame tilt driving unit (not shown) that tilts the frame 30. The frame tilt drive unit has an initial state in which the position of the roll 4B is indicated by a dotted line in FIG. 3, that is, the passage of the powder 20 when the powder 20 passes between the rolls 4A and 4B of the press roll 4 shown in FIG. From the state where the angle θ formed by the direction H and the gravity direction G is 0 °, the position of the roll 4B is set to a position where the angle θ indicated by the solid line in FIG. 3 is a predetermined angle in the range of 0 ° ≦ θ ≦ 90 °. 30 is tilted.

  3, the frame tilt driving unit indicates the frame 30 at a position where the angle θ in which the roll 4B is indicated by a dotted line in FIG. 3 is 0 °, and the roll 4B in FIG. 3 by a one-dot chain line. It is possible to incline between the position where the angle θ is 90 °.

  In the above-described embodiment, the roll 4B is positioned above the roll 4A, so that the passing direction H and the gravity of the powder 20 when the powder 20 passes between the rolls 4A and 4B of the press roll 4 are reduced. The angle θ formed by the direction G is 0 ≦ θ ≦ 90 °. However, the angle θ formed by the passing direction H of the powder 20 and the gravity direction G when the roll 4B is positioned below the roll 4A. May be configured to satisfy 0 ≦ θ ≦ 90 °.

  In the above embodiment, the roll 4B is movable by the roll position moving unit 19, but the roll position moving unit 19 moves the position of the roll 4A instead of or in addition to the roll 4B. It is good also as a structure which enables.

  In the above-described embodiment, as an initial state, the angle θ formed by the passing direction H of the powder 20 and the gravity direction G when the powder 20 passes between the rolls 4A and 4B of the pressing roll 4 is 0 °. However, if the angle θ can be changed in the range of 0 ° ≦ θ ≦ 90 ° when the rolled sheet 6 is manufactured, the angle θ in the initial state is not limited to this. That is, the angle θ in the initial state may be in the range of 0 ° ≦ θ ≦ 90 °.

  In the above-described embodiment, the roll position moving unit 19 is configured to move the roll 4B so that the angle θ is a predetermined angle in the range of 0 ° ≦ θ ≦ 90 °. However, the angle θ is 0 °. It is good also as a structure which moves the roll 4B so that it may become a predetermined angle of <theta <90 degree.

  In the above-described embodiment, the sheet-like molded product 28 is compression-molded on one surface of the backup base material 22, but the sheet-shaped molded product 28 may be molded on both sides. It is good also as a structure which compresses the sheet-like molding 28 directly, without using the base material 22. FIG.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated further more concretely, this invention is not restrict | limited to the following Example. Parts and% are based on weight unless otherwise specified.

(Manufacture of granulated particles)
Artificial graphite (volume average particle size: 24.5 μm, graphite interlayer distance (interval of (002) plane by X-ray diffraction (d value)): 0.354 nm as negative electrode active material, 97 parts, carboxymethylcellulose sodium salt 1.5 parts, and BM-400B (manufactured by Nippon Zeon Co., Ltd.) as a binder in an amount of 1.5 parts in terms of solid content, and ion-exchanged water is added so that the solid content concentration is 20% The slurry for composite particles was obtained by mixing and dispersing. The obtained composite particle slurry was sprayed using a spray dryer (Okawara Chemical Co., Ltd.) and a rotating disk atomizer (diameter 65 mm), rotating at 25,000 rpm, hot air temperature 160 ° C., particle recovery. Spray drying granulation was performed under conditions of an outlet temperature of 90 ° C. to obtain composite particles for a negative electrode. The obtained composite particles had a volume average particle diameter of 70 μm.

(Measurement of basis weight)
In the powder rolling apparatus 2 having the apparatus configuration shown in FIG. 1, the above-described composite particles having a particle diameter of 70 μm are used as the powder 20, and the roll gap between the roll 4 </ b> A and the roll 4 </ b> B is 0.1 mm to produce the rolled sheet 6. went. Further, an aluminum foil having a thickness of 30 μm whose surface was treated with a conductive adhesive was used as the backup base material 22. Here, the angle θ formed by the passing direction H of the powder 20 and the gravity direction G when the powder 20 passes between the rolls 4A and 4B of the pressing roll 4 is 0 °, 11.5 °, 23.6. The sheet-like molded product 28 was produced at an angle of 36 °. Further, when the sheet-like molded product 28 is produced, the composite particles and the aluminum foil are put into the powder rolling apparatus 2, and the amount of powder (weight per unit, unit: mg) applied to the aluminum foil by the press roll 4. / Cm ² ) and the results are shown in Table 2.

  As shown in Table 1, the basis weight decreased as the angle θ formed by the passing direction H of the powder 20 and the gravity direction G increased. Moreover, since the film thickness of the obtained sheet-like molded product 28 becomes thinner as the basis weight becomes smaller, the film thickness of the sheet-like molded product 28 increases as the angle θ formed by the passing direction H of the powder 20 and the gravity direction G increases. Was shown to be thinner.

DESCRIPTION OF SYMBOLS 2 ... Powder rolling apparatus, 4 ... Roll for press, 6 ... Rolled sheet, 14A, 14B ... Rotating shaft, 20 ... Powder, 22 ... Backup base material, 28 ... Sheet-like molded product

Claims (6)

It has a pair of press rolls arranged in parallel with the rotation axis, and compresses the composite particles obtained by granulating the components including the electrode active material and the binder on the base material by the pair of press rolls When forming the electrode composition layer on the base material by forming, a rolling part through which the composite particles pass between the pair of press rolls,
A measurement unit for measuring the basis weight of the composite particles with respect to the base material when compression molding is performed by the rolling unit;
At least one of the pair of press rolls such that an angle θ between the direction of passage of the composite particles and the direction of gravity between the pair of press rolls is a predetermined angle in a range of 0 ° <θ <90 °. A drive unit for moving the position of the press roll ;
An apparatus for manufacturing a sheet for a lithium ion secondary battery electrode, comprising: a control unit that drives the drive unit based on a measurement result of the measurement unit. The drive unit according to claim 1 Symbol placement lithium ion secondary battery electrode sheet is characterized by moving upward from one other press roll of the press roll of the pair of press rolls Manufacturing equipment. The driver comprises a pair of frames for supporting the press roll and wherein the tilting claim 1 Symbol placement lithium ion secondary battery electrode sheet manufacturing apparatus. It has a pair of press rolls arranged in parallel with the rotation axis, and compresses the composite particles obtained by granulating the components including the electrode active material and the binder on the base material by the pair of press rolls When forming the electrode composition layer on the substrate by molding, the electrode composition layer is formed on the substrate using a rolling device in which the composite particles pass between the pair of press rolls. Rolling process to form;
A measurement step of measuring the basis weight of the composite particles with respect to the base material in the rolling step by a measurement unit ;
Based on the measurement result of the measurement step, the angle θ between the passing direction of the composite particles and the gravity direction between the pair of press rolls is a predetermined angle in a range of 0 ° <θ <90 °. And a driving step of moving at least one of the press rolls of the pair of press rolls by a drive unit . A method for producing a sheet for a lithium ion secondary battery electrode, comprising: 5. The lithium ion secondary battery electrode according to claim 4 , wherein the driving step includes a step of moving one press roll of the pair of press rolls above the other press roll. 6. Sheet manufacturing method. 5. The method of manufacturing a sheet for a lithium ion secondary battery electrode according to claim 4 , wherein the driving step includes a step of inclining a frame that supports the pair of press rolls.

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