CN104638243B - The technique preparing pyrophosphate sodium ion battery electrode material with sodium jarosite - Google Patents
The technique preparing pyrophosphate sodium ion battery electrode material with sodium jarosite Download PDFInfo
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- 239000007772 electrode material Substances 0.000 title claims abstract description 41
- 229910052935 jarosite Inorganic materials 0.000 title claims abstract description 34
- 229910001415 sodium ion Inorganic materials 0.000 title claims abstract description 21
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 17
- XPPKVPWEQAFLFU-UHFFFAOYSA-J diphosphate(4-) Chemical compound [O-]P([O-])(=O)OP([O-])([O-])=O XPPKVPWEQAFLFU-UHFFFAOYSA-J 0.000 title claims abstract description 9
- 235000011180 diphosphates Nutrition 0.000 title claims abstract description 9
- 239000011734 sodium Substances 0.000 title description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 title description 3
- 229910052708 sodium Inorganic materials 0.000 title description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 24
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000002243 precursor Substances 0.000 claims abstract description 20
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 11
- 229920000742 Cotton Polymers 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 239000000835 fiber Substances 0.000 claims abstract description 7
- 238000009987 spinning Methods 0.000 claims abstract description 7
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 5
- 230000001681 protective effect Effects 0.000 claims abstract description 5
- 239000003350 kerosene Substances 0.000 claims abstract description 4
- 239000010446 mirabilite Substances 0.000 claims abstract description 4
- RSIJVJUOQBWMIM-UHFFFAOYSA-L sodium sulfate decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-]S([O-])(=O)=O RSIJVJUOQBWMIM-UHFFFAOYSA-L 0.000 claims abstract description 4
- 239000003381 stabilizer Substances 0.000 claims description 7
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 6
- MUBZPKHOEPUJKR-UHFFFAOYSA-N oxalic acid group Chemical group C(C(=O)O)(=O)O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 6
- 238000010304 firing Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 3
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- 229920002125 Sokalan® Polymers 0.000 claims description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 2
- 235000006408 oxalic acid Nutrition 0.000 claims description 2
- 239000004584 polyacrylic acid Substances 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 2
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 2
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 2
- 239000011975 tartaric acid Substances 0.000 claims description 2
- 235000002906 tartaric acid Nutrition 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000002440 industrial waste Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910052725 zinc Inorganic materials 0.000 description 8
- 239000011701 zinc Substances 0.000 description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 7
- 229910001416 lithium ion Inorganic materials 0.000 description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 description 3
- 235000011152 sodium sulphate Nutrition 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000009854 hydrometallurgy Methods 0.000 description 2
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 229910001813 natrojarosite Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- BYTVRGSKFNKHHE-UHFFFAOYSA-K sodium;[hydroxy(oxido)phosphoryl] phosphate;iron(2+) Chemical group [Na+].[Fe+2].OP([O-])(=O)OP([O-])([O-])=O BYTVRGSKFNKHHE-UHFFFAOYSA-K 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
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- 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
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
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- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- 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
- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
-
- 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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- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
本发明公开了一种用黄钠铁矾制备焦磷酸盐钠离子电池电极材料的工艺，其特征在于，在黄钠铁矾中加入稀硫酸溶液，搅拌直到黄钠铁矾溶解后，加入溶胶稳定剂、浓磷酸、芒硝和成纤剂，得到前驱体溶胶；前驱体溶胶浓缩后放入到纺丝机中，得到电极材料棉前驱体；将电极材料棉前驱体干燥，然后在由煤油分解产生的保护气氛下煅烧，最终获得棉花状的钠离子电池电极材料。本发明采用工业废渣制备高附加值的电极材料，成本低，性能好，工艺简单，具有良好的经济效益和环境效益。The invention discloses a process for preparing pyrophosphate sodium ion battery electrode materials by using jarosite, which is characterized in that dilute sulfuric acid solution is added to jarosite, stirred until the jarosite is dissolved, and the sol is added to stabilize the agent, concentrated phosphoric acid, Glauber's salt and fiber forming agent to obtain the precursor sol; the precursor sol is concentrated and put into the spinning machine to obtain the electrode material cotton precursor; the electrode material cotton precursor is dried, and then produced by kerosene decomposition Calcined under a protective atmosphere to obtain a cotton-like electrode material for sodium-ion batteries. The invention adopts industrial waste residues to prepare high value-added electrode materials, has low cost, good performance, simple process, and good economic and environmental benefits.
Description
技术领域technical field
本发明涉及一种钠离子电池电极材料制备方法，特别涉及一种利用炼锌厂排放的废渣-黄钠铁矾来制备焦磷酸盐钠离子电池电极材料的方法。The invention relates to a preparation method of an electrode material for a sodium ion battery, in particular to a method for preparing an electrode material for a pyrophosphate sodium ion battery by utilizing the waste slag-jarosite discharged from a zinc smelter.
背景技术Background technique
高性能锂离子电池及其电极材料的研究是电化学、材料化学、物理学等领域研究的热点，而同为元素周期表第I主族的钠离子和锂离子的性质有许多相似之处，钠离子完全有可以和锂离子电池一样构造一种广泛使用的二次电池。并且钠离子电池与锂离子电池相比，原材料成本比锂离子电池低，半电池电位(E0Na+/Na＝E0Li+/Li+0.3V)比锂离子电池高，适合采用分解电压更低的电解液，因而安全性能更佳[贾旭平，陈梅.钠离子电池电极材料研究进展[J].中国电子科学研究院学报，2012，7(6)：581-585]。Research on high-performance lithium-ion batteries and their electrode materials is a hot spot in the fields of electrochemistry, material chemistry, and physics. The properties of sodium ions and lithium ions, which are both the main group I of the periodic table of elements, have many similarities. Sodium ions are perfectly capable of constructing a widely used secondary battery like lithium-ion batteries. And compared with lithium-ion batteries, sodium-ion batteries have lower raw material costs than lithium-ion batteries, and higher half-cell potentials (E 0Na+ /Na=E 0Li+/Li+ 0.3V) than lithium-ion batteries, and are suitable for electrolysis with lower decomposition voltages. Liquid, so the safety performance is better [Jia Xuping, Chen Mei. Research progress of electrode materials for sodium ion batteries [J]. Journal of China Institute of Electronic Science, 2012, 7(6): 581-585].
目前，制备钠离子电极材料的原料主要为化工原料，成本较高，且为了提高电极材料的性能，通常添加多种元素进行多元掺杂，如吴锋等人制备了yNaFe1/2Ni1/2O2-(1-y)Na2MnO3电极材料，性能优于单元材料，其中y为0.1～0.5，50次循环后容量保持率仅为88％[吴锋，谢嫚，王晓明等.一种钠离子电池电极材料及其制备方法[p].CN201210567797]。多元参杂进一步提高了制备成本。At present, the raw materials for preparing sodium ion electrode materials are mainly chemical raw materials, and the cost is relatively high. In order to improve the performance of electrode materials, various elements are usually added for multiple doping. For example, Wu Feng et al. prepared yNaFe 1/2 Ni 1/ 2 O 2 -(1-y)Na 2 MnO 3 electrode material has better performance than unit material, where y is 0.1-0.5, and the capacity retention rate is only 88% after 50 cycles [Wu Feng, Xie Man, Wang Xiaoming et al. A sodium ion battery electrode material and its preparation method [p].CN201210567797]. Multiple doping further increases the preparation cost.
发明内容Contents of the invention
在湿法冶金和无机化工生产中，当有较大量的铁需要除去时，目前广泛采用生成具有良好过滤性能的黄铁矾除铁工艺。黄钠铁矾渣法是六十年代澳大利亚电锌公司雷斯顿电锌厂经多年的试验研究之后发展起来的，首先应用于锌冶炼过程的一种除铁方法。与此同时,娜威锌公司和西班牙的阿斯图里亚那锌公司也分别发展了这种方法，从此黄钠铁矾法在世界锌冶炼中很快得到推广和应用。黄钠铁矾的化学式为[NaFe3(SO4)2(OH)6]，只能在pH只为1.5-2.5时稳定，另外黄钠铁矾中含有少量的Zn、Cu、Cd等重金属，属于危险废物的范畴，如不对其处理，将污染环境。In hydrometallurgy and inorganic chemical production, when there is a large amount of iron to be removed, the iron removal process of jarosite with good filtration performance is widely used at present. The jarosite slag method was developed in the 1960s by the Reston Electric Zinc Plant of the Australian Electric Zinc Company after years of experimental research. It was first applied to a method of iron removal in the zinc smelting process. At the same time, Nawei Zinc Company and Spain's Asturiana Zinc Company also developed this method respectively. Since then, the jarosite method has been quickly promoted and applied in zinc smelting in the world. The chemical formula of jarosite is [NaFe 3 (SO 4 ) 2 (OH) 6 ], which is only stable when the pH is only 1.5-2.5. In addition, jarosite contains a small amount of heavy metals such as Zn, Cu, and Cd. It belongs to the category of hazardous waste, if it is not disposed of, it will pollute the environment.
本发明的目的是提供一种基于处理湿法冶炼中黄钠铁矾来制备高附加值钠离子电池电极材料的方法，具有良好的节能减排环保效益。The purpose of the present invention is to provide a method for preparing high value-added sodium ion battery electrode materials based on the treatment of jarosite in hydrometallurgy, which has good energy saving, emission reduction and environmental protection benefits.
为达到以上目的，本发明是采取如下技术方案予以实现的：To achieve the above object, the present invention is achieved by taking the following technical solutions:
一种用黄钠铁矾制备焦磷酸盐钠离子电池电极材料的工艺，其特征在于， 包括下述步骤：A kind of technology that prepares pyrophosphate sodium ion battery electrode material with jarosite, is characterized in that, comprises the steps:
(1)在黄钠铁矾中加入稀硫酸溶液，搅拌直到黄钠铁矾溶解后，加入溶胶稳定剂、浓磷酸、芒硝和成纤剂，得到前驱体溶胶：其中，溶胶稳定剂为草酸、柠檬酸、酒石酸中的一种，加入量为黄钠铁矾摩尔量的200mol％；浓磷酸中磷酸的加入量为黄钠铁矾摩尔量的600mol％；芒硝加入量为黄钠铁矾摩尔量的250mol％；成纤剂为聚乙烯吡咯烷酮、聚乙烯醇、聚丙烯酸中的一种，加入量为黄钠铁矾摩尔量的1-5mol％；(1) add dilute sulfuric acid solution in jarosite, after stirring until jarosite dissolves, add sol stabilizer, concentrated phosphoric acid, Glauber's salt and fiber forming agent, obtain precursor sol: wherein, sol stabilizer is oxalic acid, One of citric acid and tartaric acid, the amount added is 200mol% of the molar amount of jarosite; the amount of phosphoric acid added in concentrated phosphoric acid is 600mol% of the molar amount of jarosite; 250mol%; the fiber forming agent is one of polyvinylpyrrolidone, polyvinyl alcohol, polyacrylic acid, and the addition is 1-5mol% of the molar amount of jarosite;
(2)将步骤(1)所得前驱体溶胶浓缩；(2) Concentrating the precursor sol obtained in step (1);
(3)将浓缩后的前驱体溶胶通过离心纺丝机纺丝，得到电极材料棉前驱体；(3) spinning the concentrated precursor sol by a centrifugal spinning machine to obtain the electrode material cotton precursor;
(4)将步骤(3)得到的电极材料棉前驱体干燥，然后在由煤油分解产生的保护气氛下加热至900℃烧成，保温6小时，最终获得棉花状的钠离子电池电极材料。(4) The electrode material cotton precursor obtained in step (3) was dried, then heated to 900° C. for firing in a protective atmosphere generated by kerosene decomposition, and kept for 6 hours to finally obtain a cotton-like electrode material for sodium ion batteries.
上述工艺中，所述稀硫酸中硫酸的加入量为黄钠铁矾摩尔量的300mol％；稀硫酸溶液的质量浓度为10％。In the above process, the added amount of sulfuric acid in the dilute sulfuric acid is 300mol% of the molar weight of jarosite; the mass concentration of the dilute sulfuric acid solution is 10%.
所述浓磷酸的质量浓度为85％。The mass concentration of the concentrated phosphoric acid is 85%.
本发明由于采用了工业废渣-黄钠铁矾来制备高附加值的电极材料，所以具有成本低，工艺简单、环保效益凸显的特点。同时，制备的电极材料性能好，组装电池时，无需加导电剂和粘结剂。Because the present invention adopts industrial waste residue-jarosite to prepare high value-added electrode materials, it has the characteristics of low cost, simple process and prominent environmental protection benefits. At the same time, the prepared electrode material has good performance, and there is no need to add conductive agent and binder when assembling the battery.
具体实施方式detailed description
一种用黄钠铁矾制备焦磷酸盐钠离子电池电极材料的工艺，包括下述步骤：A kind of technology that prepares pyrophosphate sodium ion battery electrode material with jarosite, comprises the steps:
(1)前驱体溶胶的制备：在黄钠铁矾中加入稀硫酸溶液，搅拌直到黄钠铁矾溶解后，加入溶胶稳定剂、浓磷酸、芒硝(硫酸钠)和成纤剂(配方见表1)；(1) Preparation of precursor sol: add dilute sulfuric acid solution to jarosite, stir until jarosite dissolves, then add sol stabilizer, concentrated phosphoric acid, Glauber's salt (sodium sulfate) and fiber-forming agent (recipe see table 1);
(2)前驱体溶胶在60℃条件下浓缩；(2) Precursor sol is concentrated at 60°C;
(3)将浓缩后的前驱体溶胶放入到离心纺丝机中，采用离心纺丝工艺得到电极材料棉前驱体；(3) Put the concentrated precursor sol into the centrifugal spinning machine, and obtain the electrode material cotton precursor by centrifugal spinning process;
(4)将电极材料棉前驱体干燥，然后在由煤油分解产生的保护气氛下加热至900℃烧成，并在烧成温度下保温6小时，最终获得棉花状的钠离子电池电极材料。(4) The electrode material cotton precursor was dried, then heated to 900°C for firing under a protective atmosphere generated by the decomposition of kerosene, and kept at the firing temperature for 6 hours to finally obtain a cotton-like electrode material for sodium ion batteries.
采用该纤维棉为负极、钠为对电极组装成电池，对其进行循环充放电测试，循环50次后的放电容量均大于90mAh/g，容量保持率均大于90％(见表 2)。The battery was assembled using the fiber cotton as the negative electrode and sodium as the counter electrode, and the cycle charge and discharge test was carried out. After 50 cycles, the discharge capacity was greater than 90mAh/g, and the capacity retention rate was greater than 90% (see Table 2).
表1制备工艺的配方The formula of table 1 preparation technology
注：稀硫酸的浓度为10％，表中的加入量根据溶液中的H2SO4计算；浓磷酸的浓度为85％，表中的加入量根据溶液中的H3PO4计算Note: The concentration of dilute sulfuric acid is 10%, the amount added in the table is calculated based on the H 2 SO 4 in the solution; the concentration of concentrated phosphoric acid is 85%, the amount added in the table is calculated based on the H 3 PO 4 in the solution
表2电极材料的性能Table 2 Performance of electrode materials
本发明用硫酸将黄钠铁矾分解，得到硫酸铁和硫酸钠的混合溶液，硫酸铁为电极材料提供了铁源，硫酸钠为电极材料提供部分钠源，黄钠铁矾中的其它金属离子提供掺杂相。在制备前驱体溶胶的时，加入溶胶稳定剂，可阻碍胶粒的生长，提高溶胶的稳定性，有利于溶胶在工业化生产中的应用。溶胶稳定剂和纤维形成剂在保护气氛条件下煅烧时，变成碳包裹在电极材料周 围，将提高电极材料的导电性能，阻碍电极材料的晶粒生长，从而提高电极材料的性能。电极材料煅烧后，得到主要物相为焦磷酸铁钠[Na2FeP2O7]和碳的复合电极材料。The present invention uses sulfuric acid to decompose jarosite to obtain a mixed solution of ferric sulfate and sodium sulfate. Ferric sulfate provides an iron source for electrode materials, and sodium sulfate provides part of a sodium source for electrode materials. Other metal ions in jarosite A doped phase is provided. When preparing the precursor sol, adding a sol stabilizer can hinder the growth of colloidal particles, improve the stability of the sol, and facilitate the application of the sol in industrial production. When the sol stabilizer and fiber forming agent are calcined under protective atmosphere conditions, they will become carbon wrapped around the electrode material, which will improve the electrical conductivity of the electrode material, hinder the grain growth of the electrode material, and thus improve the performance of the electrode material. After the electrode material is calcined, a composite electrode material whose main phase is sodium iron pyrophosphate [Na 2 FeP 2 O 7 ] and carbon is obtained.
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