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A kind of preparation method of graphite negative electrode material for high temperature

A graphite anode, high temperature technology, applied in nanotechnology, battery electrodes, nanotechnology and other directions for materials and surface science, can solve the problems of increased electrode impedance, practical application limitations, limited performance improvement, etc., to reduce impedance , to achieve normal work and good stability

Active Publication Date: 2021-04-02
苏州华赢新能源材料科技有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Previous work mainly focused on selecting suitable film-forming additives to improve the surface properties of graphite, thereby improving the high-temperature cycle stability of graphite anode materials. It should be pointed out that although some film-forming additives have played a certain role, the performance improvement is very limited. , the reason is that the film-forming additives of the electrolyte need to diffuse to the graphite surface to play a role, but the diffusion process itself is affected by the concentration gradient and is relatively slow. Not only that, after the diffusion-controlled SEI film is formed, the film-forming additives will continue to diffuse to the graphite surface. The electrode surface makes the impedance of the electrode increase rapidly, and the practical application is limited

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  • A kind of preparation method of graphite negative electrode material for high temperature
  • A kind of preparation method of graphite negative electrode material for high temperature
  • A kind of preparation method of graphite negative electrode material for high temperature

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preparation example Construction

[0023] The preparation method of high-temperature graphite negative electrode material of the present invention, it comprises the following steps: (a) organic acid salt is dissolved in the solvent to obtain organic acid salt solution; The chemical structure general formula of described organic acid salt is: In the formula, R is hydrogen, alkyl, carboxyl, hydroxyl, aromatic or alkenyl, M + (b) mixing graphite with the organic acid salt solution, then heating and evaporating under constant stirring to completely volatilize the solvent. By mixing graphite with organic acid salt solution, followed by heating and evaporation to completely volatilize the solvent, a uniform coating layer is formed on the graphite surface through liquid phase impregnation, and the thickness of the coating layer is adjustable; During the first battery formation process, this compound with a special double bond structure can obtain electrons and undergo self-polymerization to form a stable SEI film. Th...

Embodiment 1

[0027] The present embodiment provides a kind of high-temperature lithium-ion battery graphite negative electrode material preparation method, and it comprises the following steps:

[0028] (a) Take 3.4g of itaconic acid and dissolve it in 1000mL of deionized water, drop it into the prepared sodium hydroxide solution until the pH of the solution is 7, and the quality of itaconic acid sodium salt at this time is 4g;

[0029] (b) Add 200g of natural graphite (Shenzhen Beiterui) to the above solution again, and make the graphite completely soaked in the solution by mechanical stirring. The container used is a 2500mL beaker; the beaker is placed in a temperature-controlled water bath at 60°C, Continue to stir until the liquid in the beaker is completely volatilized; place the product in a vacuum oven at 80°C, and dry it for 12 hours to remove residual moisture; the mass of itaconate in the obtained lithium-ion battery graphite negative electrode material is 2% of the graphite mass ...

Embodiment 2

[0031] This embodiment provides a method for preparing graphite negative electrode materials for high-temperature lithium-ion batteries. The quality of conic acid salt is 4% of graphite mass, and the obtained lithium iron phosphate lithium iron phosphate cathode material SEM, TEM figure are respectively as follows figure 1 (c) and figure 1 (g) shown.

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Abstract

The invention relates to a preparation method of a graphite negative electrode material for high temperature use, which comprises the following steps: (a) dissolving an organic acid salt in a solventto obtain an organic acid salt solution; Wherein R is hydrogen, alkyl, carboxyl, hydroxyl, aryl or olefin group, and M + is a metal cation, wherein R is hydrogen, alkyl, carboxyl, aryl or olefin group; (b) mix that graphite with the organic acid salt solution, and then heating and evaporate under the condition of continuous stirring to completely volatilize the solvent. So that a uniform coating layer is formed on the surface of the graphite by liquid phase immersion and the thickness of the coating layer is adjustable; The coating layer is not destroyed during subsequent electrode preparation.

Description

technical field [0001] The invention belongs to the field of negative electrodes of lithium batteries, and relates to a graphite negative electrode material, in particular to a preparation method of a graphite negative electrode material for high temperature. Background technique [0002] Optimizing anode materials is an important way to improve the performance and stability of lithium-ion batteries. Graphite, as the anode material of lithium-ion batteries, has many advantages: the cost of graphite is low, the specific capacity is relatively high, and the harm to the environment is relatively small. However, there are also some problems in the wide application of graphite materials, one of which is to improve the stable working temperature of graphite materials and expand the application range of lithium-ion batteries. [0003] At the beginning of the electrochemical cycle, the graphite negative electrode will undergo a series of reactions with the electrolyte, and a solid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/587H01M4/62H01M10/0525Y02E60/10
Inventor 郑洪河衡帅朱国斌王艳曲群婷邵杰张静宇
Owner 苏州华赢新能源材料科技有限公司