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A kind of preparation method of high capacity lithium ion battery negative electrode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low theoretical capacity of materials and inability to change the lithium storage structure of materials, so as to increase the gram specific capacity and improve cycle stability Effect

Active Publication Date: 2022-07-29
GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the negative electrode of commercialized lithium-ion batteries uses graphitized carbon, and its theoretical lithium intercalation capacity is 372mAh / g. Although the existing technology can improve the material particle orientation and cycle life, it cannot change the internal lithium storage structure of the material. The theoretical capacity of the material is lower than 372mAh / g. With the continuous improvement of battery energy density, the gram capacity of carbon negative electrode materials needs to be greatly improved.

Method used

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  • A kind of preparation method of high capacity lithium ion battery negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) pulverizing petroleum coke (green coke) to obtain particles with a particle size of 5 μm;

[0023] (2) heat treatment at 1100°C under inert atmosphere conditions of the obtained green coke powder, and then pulverized to 5 μm;

[0024] (3) in the presence of potassium carbonate, use an activator (steam) at 750° C. to treat the product of step (2) for 1 h;

[0025] (4) Mix 100 parts with 30 parts of phenolic resin, and carbonize at 1100 ℃ under an inert atmosphere;

[0026] (5) Heat treatment at 2000°C for 12h in an inert atmosphere, mix, sieve, and magnetically separate after cooling to obtain nano-scale micropores with a hard carbon protective layer.

Embodiment 2

[0028] (1) pulverize an appropriate amount of petroleum coke (cooked coke) to 25 μm;

[0029] (2) In the presence of potassium carbonate, the product of step (2) is treated at 800° C. with an activator (steam) for 14h;

[0030] (3) Mix 100 parts with 20 parts of phenolic resin, and carbonize at 1200°C under an inert atmosphere;

[0031] (4) Heat treatment at 2500°C for 36h in an inert atmosphere, mix, sieve, and magnetically separate after cooling to obtain nano-scale micropores with a hard carbon protective layer.

Embodiment 3

[0033] (1) pulverizing petroleum coke (green coke) to obtain particles with a particle size of 30 μm;

[0034] (2) heat treatment at 1300°C under inert atmosphere conditions of the obtained green coke powder, and then pulverized to 20 μm;

[0035] (3) 900 ℃ using activator (CO 2 ) the product of step (2) is treated for 18h;

[0036] (4) Mix 100 parts with 25 parts of phenolic resin, and carbonize at 1300 ℃ under an inert atmosphere;

[0037] (5) Heat treatment at 2800°C for 48h in an inert atmosphere, mix, sieve and magnetically separate after cooling to obtain nano-scale micropores with a hard carbon protective layer.

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Abstract

The invention discloses a method for preparing a negative electrode material for a high-capacity lithium ion battery, including (1) preparation of a precursor, (2) activation of the precursor, (3) hard carbon coating of the precursor, (4) heat treatment and cooling sieving and other steps. Using the technical means of the present invention, nano-scale micropores can be formed in the graphite layer and between the layers, and the lithium intercalation channel can be increased, thereby increasing the gram specific capacity (430mAh / g) of the negative electrode, and the improvement rate is relatively high compared to the existing best technology (372mAh / g). ) reaches 15.6%, and the hard carbon coating layer can better protect the nano-scale microporous graphite structure and greatly improve the cycle stability.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a preparation method of a high capacity lithium ion battery negative electrode material. Background technique [0002] Lithium-ion batteries, as a new type of chemical power source, are widely used in daily life due to their excellent performance. Electrode materials are the main factors affecting battery performance and cost, and research and development of electrode materials is of great significance to the development of lithium batteries. At present, the negative electrode of commercial lithium-ion battery adopts graphitized carbon, and its theoretical lithium intercalation capacity is 372mAh / g. Although the existing technology can improve the particle orientation of the material and improve the cycle life, it cannot change the internal lithium storage structure of the material. The theoretical capacity of carbon anode materials is lower than 372mAh / g. Wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62
CPCH01M4/623H01M4/625Y02E60/10
Inventor 江船杨万光陈勇勇
Owner GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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