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Liquid-phase coated graphite negative electrode material and preparation method thereof

A graphite negative electrode, liquid phase coating technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of complex modification methods, environmental pollution, and high production costs, achieve excellent capacity retention rate, and reduce environmental pollution. , the effect of low production cost

Inactive Publication Date: 2021-03-12
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problems of high production cost, complicated modification methods, and easy environmental pollution during the production process of liquid-phase coated graphite negative electrode materials in the prior art, and provide a liquid-phase coated graphite negative electrode Material preparation method

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  • Liquid-phase coated graphite negative electrode material and preparation method thereof
  • Liquid-phase coated graphite negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Preparation of Embodiment 1 Liquid Phase Coated Graphite Negative Electrode Material

[0024] (1) Mechanically pulverize 1200kg of raw coke with a pulverizer, and then shape it with a mechanical grinding and shaping machine to obtain raw coke with a particle size of 8-10μm. Randomly take 200kg of it and place it in a drum furnace at a temperature of 650°C and a pressure of 0.09MPa, thermal stirring treatment under nitrogen protection for 480min; the green coke after thermal stirring treatment is subjected to graphitization treatment at 3500°C, and the graphitization treatment time is 45h;

[0025] (2) Take 80kg of graphitized return material, and mix it with 4kg liquid phenolic resin (viscosity is 21-24mPa s) in the kneading pot and then carry out static carbonization treatment. The temperature of curing treatment in the carbonization treatment process is 90-95 °C, the time of curing treatment is 1h, the temperature of carbonization treatment is 1150°C, and the time of ...

Embodiment 2

[0026] Preparation of Example 2 Liquid Phase Coated Graphite Negative Electrode Material

[0027] (1) Mechanically pulverize 1200kg of raw coke with a pulverizer, and then shape it with a mechanical grinding and shaping machine to obtain raw coke with a particle size of 8-10μm. Randomly take 200kg of it and place it in a drum furnace at a temperature of 600°C and a pressure of 0.09MPa, thermal stirring treatment under nitrogen protection for 480min; the green coke after thermal stirring treatment is subjected to graphitization treatment at 3500°C, and the graphitization treatment time is 45h;

[0028] (2) Get 80kg of graphitized return material, and mix it with 2.4kg liquid phenolic resin (viscosity is 21-24mPa s) in the kneading pot, then carry out static carbonization treatment, and the temperature of curing treatment in the carbonization treatment process is 90- 95°C, the time of curing treatment is 1h, the temperature of carbonization treatment is 1150°C, and the time of c...

Embodiment 3

[0029] Preparation of Example 3 Liquid Phase Coated Graphite Negative Electrode Material

[0030] (1) Mechanically pulverize 1200kg of raw coke with a pulverizer, and then shape it with a mechanical grinding and shaping machine to obtain raw coke with a particle size of 8-10μm. Randomly take 200kg of it and place it in a drum furnace at a temperature of 600°C and a pressure of 0.09MPa, thermal stirring treatment under nitrogen protection for 480min; the raw coke after thermal stirring treatment is subjected to graphitization treatment at 3000°C, and the graphitization treatment time is 45h;

[0031] (2) Take 80kg of graphitized return material, and mix it with 4kg liquid phenolic resin (viscosity is 25-28mPa s) in the kneading pot and then carry out static carbonization treatment. The temperature of curing treatment in the carbonization treatment process is 90-95 °C, the time of curing treatment is 1.5h, the temperature of carbonization treatment is 1150°C, and the time of car...

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Abstract

The invention discloses a liquid-phase coated graphite negative electrode material and a preparation method thereof. The preparation method comprises the following steps: (1) carrying out heat stirring treatment on petroleum coke, and then carrying out graphitization treatment on the petroleum coke subjected to heat stirring treatment to obtain a graphitized return material; and (2) uniformly mixing the graphitized recycled material with liquid phenolic resin, and performing carbonization treatment to obtain a liquid-phase coated graphite negative electrode material, wherein the viscosity of the liquid phenolic resin is 20-35 mPa.s, the curing temperature in the carbonization treatment is 90-145 DEG C, and the curing time in the carbonization treatment is 0.2-1.5 h. The preparation methodof the liquid-phase coated graphite negative electrode material is low in production cost and simple in process, the rate capability of the liquid-phase coated graphite negative electrode material isimproved, and the coating is uniform.

Description

technical field [0001] The invention relates to the technical field of graphite negative electrode materials, in particular to a method for preparing a liquid-phase coated graphite negative electrode material. Background technique [0002] The anode materials of lithium-ion batteries are usually artificial graphite and natural graphite. The main advantages of graphite as the anode material of lithium-ion batteries are low irreversible capacity, relatively high charge and discharge efficiency, and long cycle life. The theoretical lithium storage capacity is as high as 372mAh / g, but there are also relatively obvious disadvantages. , the modification method is complex, and the production process is easy to cause environmental pollution, and the cycle expansion of natural graphite is relatively large. Therefore, while the new energy industry is developing, it also puts forward higher requirements for graphite used as lithium-ion batteries. How to improve the electrochemical per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/587H01M10/0525
CPCH01M4/587H01M4/62H01M10/0525H01M2004/027Y02E60/10
Inventor 何坤席博孙文婷吴志红刘盼胡东山
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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