Process method for granulating or coating graphite negative electrode material

A graphite negative electrode and process method technology, applied in graphite, chemical instruments and methods, battery electrodes, etc., can solve the problems of unfavorable product post-processing, low product vibration, wide particle size distribution, etc., to improve processing performance and use performance , improve the cycle life and charging rate, and the effect of narrow particle size distribution

Active Publication Date: 2019-07-02
溧阳紫宸新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The conventional method of granulation is to simply mix the binder and the material, and then stir and granulate at a certain temperature. The obtained product has a wide particle size distribution and low vibration, which is not conducive to the post-processing of the product and will reduce the performance of the product, especially When the grain size is too small, it is easy to produce waste and cause irreparable losses
[0004] The conventional method of coating is to simply physically mix the solid or liquid coating agent with the material, then put the material in the crucible, and raise the temperature in a static state to make the coating agent self-leveling to form a coating layer and carbonize. The risk of unevenness, and often the obtained products have low vibration and large specific table, and the obtained products have poor processability, and the performance of cycle, first effect and high temperature resistance after making batteries cannot meet the needs of customers

Method used

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  • Process method for granulating or coating graphite negative electrode material
  • Process method for granulating or coating graphite negative electrode material
  • Process method for granulating or coating graphite negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Put the artificial graphite powder material with a particle size of 9 μm into the reactor, then keep stirring at a speed of 15 rpm, and rapidly raise the temperature to T1 and keep the temperature constant for 4 hours, T1=150°C;

[0040] At a constant temperature of 150°C, the solution binder formed by solid powder pitch-quinoline is sprayed onto the surface of the material in the reactor. The ratio of carbon source powder material to solid powder pitch is 100:9. The process is kept stirring to form an overall uniform materials;

[0041] At a stirring speed of 45rmp, raise the temperature from 150°C to 600°C at a speed of 5°C / min and keep the temperature constant for 2 hours, then raise the temperature to T2 at 2°C / min and keep the temperature constant for 3 hours to form stable composite particles, T2=850°C;

[0042] Cool to less than 50°C and discharge, then enter the roller kiln for carbonization at 1300°C;

[0043] After the carbonization is completed, mix, sieve, ...

Embodiment 2

[0045] Put the artificial graphite powder material with a particle size of 14 μm into the reaction kettle, then keep stirring at a speed of 25 rpm, and quickly raise the temperature to T1 and keep the temperature constant for 1 hour, T1=30°C;

[0046] At a constant temperature of 30°C, the petroleum liquid asphalt binder is sprayed onto the surface of the material in the reactor. The ratio of the carbon source powder material to the petroleum liquid asphalt is 100:25, and the process is kept stirring to form an overall uniform material;

[0047] At a stirring speed of 30rmp, raise the temperature from 150°C to 500°C at a speed of 3°C / min and keep the temperature constant for 3 hours, then raise the temperature to T2 at a rate of 2°C / min and keep the temperature constant for 4 hours to form stable composite particles, T2=650°C;

[0048] Cool to less than 50°C and discharge, then enter the roller kiln for carbonization at 1100°C;

[0049] After the carbonization is completed, mi...

Embodiment 3

[0051] Put the artificial graphite powder material with a particle size of 6 μm into the reaction kettle, then keep stirring at a speed of 18rmp, and quickly raise the temperature to T1 and keep the temperature constant for 2 hours, T1=280°C;

[0052] Spray the solution coating agent formed by solid powder polyvinylidene fluoride and N,N-dimethylformamide at a constant temperature of 180°C to the surface of the material in the reactor. The ratio of artificial graphite powder material to solid powder polyvinylidene fluoride is 100:6, the process is kept stirring to form an overall uniform material;

[0053]At a stirring speed of 25rmp, raise from 150°C to T2 at a speed of 3°C / min and keep the temperature constant for 2 hours, the coating agent forms a stable coating layer on the surface of the material, T2=600°C;

[0054] Cool to less than 50°C and discharge, then enter the roller kiln for carbonization at 900°C;

[0055] After the carbonization is completed, mix, sieve, and d...

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Abstract

The invention discloses a process method for granulating or coating a graphite negative electrode material. The method comprises the following steps: 1) adding a carbon source powder material of 5-30[mu]m into a reaction kettle, stirring the material at a speed of 15-25 rpm, heating the material to T1 at a heating rate of 1-6 DEG C / min, and carrying out constant temperature treatment for 0.5-4 hours, T1 ranging from room temperature to 300 DEG C; 2) at the constant temperature T1, spraying a liquid binder or a coating agent to the surface of the carbon source powder material under stirring toobtain a uniformly mixed material; 3) increasing the temperature of the reaction kettle to T2 according to a preset temperature rise condition at a stirring speed of 15-45 rpm, and performing constant-temperature treatment for 0.5-4 hours to enable the uniformly mixed materials to form stable composite particles or coatings, T2 ranging from T1 to 900 DEG C; 4) cooling the reaction kettle to be lower than 50 DEG C, feeding the reaction kettle into a roller kiln, and carbonizing the raw materials at 900-1300 DEG C, and 5) mixing, screening and demagnetizing the product after carbonization to obtain the required finished product, namely, the graphite negative electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium battery material production and manufacturing, in particular to a process for granulating or coating graphite negative electrode materials. Background technique [0002] In the industrial preparation process of graphite anode materials, processes such as granulation and coating are often used. [0003] The conventional method of granulation is to simply mix the binder and the material, and then stir and granulate at a certain temperature. The obtained product has a wide particle size distribution and low vibration, which is not conducive to the post-processing of the product and will reduce the performance of the product, especially When the grain size is too small, it is easy to produce waste and cause irreparable losses. [0004] The conventional method of coating is to simply physically mix the solid or liquid coating agent with the material, then put the material in the crucible, and raise th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205C01B32/20H01M4/36H01M4/583H01M10/052
CPCC01B32/205C01B32/20H01M4/366H01M4/583H01M10/052Y02E60/10
Inventor 李春姜武李辉冯苏宁刘芳张志清古立虎陈卫
Owner 溧阳紫宸新材料科技有限公司
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