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Modified graphite material, preparation method and application thereof and lithium ion battery

A graphite material and modification technology, applied in graphite, secondary batteries, battery electrodes, etc., can solve problems such as low capacity, poor impedance performance, and poor rate performance

Pending Publication Date: 2021-04-23
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the defects of low capacity, poor rate performance and poor impedance performance of artificial graphite materials in the prior art when used in lithium-ion batteries, the present invention provides a modified graphite material and its preparation method and application, lithium ion battery Battery

Method used

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  • Modified graphite material, preparation method and application thereof and lithium ion battery
  • Modified graphite material, preparation method and application thereof and lithium ion battery
  • Modified graphite material, preparation method and application thereof and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0051]A method of preparing a modified graphite material comprising the steps of:

[0052]S1, preparation graphite particles: pulverizing petroleum coke to D50 is 10 μm, placed in a horizontal coating, under high purity nitrogen gas protection, heat treatment at 630 ° C for 8 h; then transfer material to an Aixson graphizer, At 3000 ° C for 30 h, graphite particles;

[0053]S2, once: Place the graphite particles and oily graphene pulp (mass ratio of 100: 9) in the fusion machine, the fusion machine rotation is 280 r / min, the fusion time is 20 min;

[0054]The material was transferred to a carbonization furnace under an inert atmosphere, and the first carbonization process was 22 hours at 1150 ° C for 22 hours to obtain graphite particles.

[0055]S3, twice cover:

[0056]Add polyvinylpyrrolidone (PVP) and deionized water (7:10) in 5000 ml of three flasks (7:10), heating to 80 ° C to 90 ° C, stirring the rotation speed of 60 r / min, stirring time is 2 h, ensuring two components Uniform dispersio...

Embodiment 2

[0060]In addition to step S3, PVP: Dermage water = 5: 10, the remaining steps and conditions are the same as in Example 1.

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Abstract

The invention discloses a modified graphite material, a preparation method and application thereof and a lithium ion battery. The preparation method of the modified graphite material comprises the steps of S1, preparing graphite particles, specifically, sequentially carrying out heat treatment and graphitization on a graphite raw material to obtain the graphite particles; S2, carrying out primary coating, specifically, fusing the graphite particles and the oily graphene slurry, and carrying out first carbonization to obtain primarily coated graphite particles; and S3, carrying out secondary coating, specifically, fusing the primarily coated graphite particles and a polyvinylpyrrolidone aqueous solution, and carrying out secondary carbonization to obtain the modified graphite material. The lithium ion battery prepared from the modified graphite material is high in discharge capacity and excellent in rate capability and impedance performance.

Description

Technical field[0001]The present invention relates to a modified graphite material and a preparation method thereof, a lithium ion battery.Background technique[0002]As energy depletion and environmental development is increasing, it is increasingly important to seek alternative cleaning energy. As a new generation of energy storage materials, the lithium ion battery has the advantages of light weight, long life, high energy density, no pollution, no memory effect, is widely used in electronic devices such as mobile phones, computers, digital cameras. The lithium ion battery is mainly composed of a positive electrode material, an anode material, a diaphragm, an electrolyte, and the performance of the negative electrode material determines battery performance. Artificial graphite as the most widely used material in the negative electrode material, has the advantages of rich reserves, low price, stable electrochemical performance, and theoretical energy density. In general, the artific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/20C01B32/205C01B32/21H01M4/583H01M4/62H01M10/0525
CPCC01B32/20C01B32/205C01B32/21H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 吴政操吴仙斌苗荣荣吴志红
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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