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Negative electrode material for lithium-ion battery, method for preparing same, and lithium-ion battery

A lithium-ion battery and negative electrode material technology, applied in the field of materials, can solve the problems of difficult to meet the needs of high energy density batteries, low volume effect of conductivity, poor cycle performance, etc.

Active Publication Date: 2021-12-31
江苏集芯半导体硅材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific capacity of the current graphite-based negative electrode materials is approaching the theoretical limit, and there is limited room for further improvement, making it difficult to meet the needs of high-energy-density batteries.
[0003] Silicon is considered to be the anode material for next-generation high-energy-density lithium-ion batteries, but its low conductivity and severe volume effect (expansion rate >300%) during charge and discharge lead to particle crushing and a solid electrolyte layer on its surface ( SEI film) is repeatedly formed, which causes problems such as capacity loss and poor cycle performance, which greatly limits its application in lithium-ion batteries.
Although the volume expansion and low conductivity of silicon in the charging and discharging process can be reduced by forming composite materials through technologies such as nanonization and carbon coating, the negative electrode materials of ion batteries and their preparation methods and lithium ion batteries still need to be solved. Improve

Method used

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  • Negative electrode material for lithium-ion battery, method for preparing same, and lithium-ion battery
  • Negative electrode material for lithium-ion battery, method for preparing same, and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Form composite material precursor slurry: mix SiO, graphite, polyaniline and additives in a weight ratio of 10:50:10:8, wherein the graphite is spherical graphite with a median particle size of 20 microns, and the additive is polyethylene glycol alcohol. The rotational speed of the sanding treatment is 1000r / min, the sanding time is 6h, the solvent amount during the sanding treatment is 60 parts by weight, the drying treatment is airflow spray drying, the inlet air temperature is 180°C, and the exhaust air temperature is 80°C. The slurry processing capacity is 6L / h, followed by granulation.

[0075] The granulated material was calcined, and the temperature was raised to 350°C for 4 hours at a heating rate of 5°C / min, then to 1200°C for 5 hours, and then lowered to room temperature. Then pickling treatment is carried out in a mixed solution of hydrofluoric acid and hydrochloric acid with 95 parts by weight of hydrofluoric acid, and then washed with deionized water until...

Embodiment 2

[0079] The remaining parameters are the same as in Example 1, except that polypyrrole is used as the conductive polymer.

Embodiment 3

[0081] The remaining parameters are the same as in Example 1, except that the gas mixture passed into the fluidized bed reactor is not in a turbulent state when depositing silicon particles.

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Abstract

The invention provides a negative electrode material of a lithium ion battery, a preparation method thereof and the lithium ion battery. The method includes: obtaining a composite material precursor, performing calcination treatment to obtain a composite material; using chemical vapor deposition to deposit and form silicon particles on the conductive skeleton of the composite material, wherein the chemical vapor deposition adopts silane-hydrogen-gas The inert gas three-component reaction system is realized in a fluidized bed reactor; the composite material formed with the silicon particles is subjected to carbon coating treatment to form the negative electrode material. The silicon-carbon composite material prepared by the method of the invention, that is, the negative electrode material has the characteristics of good cycle stability, high capacity retention rate, good conductivity and the like.

Description

technical field [0001] The invention relates to the field of materials, in particular to a negative electrode material of a lithium ion battery, a preparation method thereof and the lithium ion battery. Background technique [0002] The negative electrode material of lithium ion battery is an important component of the lithium battery midstream industry, and the performance of negative electrode material also has a decisive impact on the performance of lithium ion battery. At present, although graphite-based negative electrode materials have price advantages, they are highly compatible with current positive electrodes and electrolytes. However, the specific capacity of the current graphite-based anode materials is approaching the theoretical limit, and there is limited room for further improvement, making it difficult to meet the needs of high-energy-density batteries. [0003] Silicon is considered to be the anode material for next-generation high-energy-density lithium-io...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/38H01M4/587H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/362H01M4/386H01M4/628H01M4/625H01M4/624H01M4/587H01M10/0525B82Y30/00B82Y40/00H01M2004/027H01M2004/021Y02E60/10
Inventor 乔帅帅郑加镇江宏富吴亚娟燕靖
Owner 江苏集芯半导体硅材料研究院有限公司