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Silicon oxide/carbon composite anode material and preparation method thereof and lithium ion battery

A silicon oxide and negative electrode material technology, applied in the field of energy storage, can solve the problems of cycle performance, rate performance, discharge capacity, limited commercial application, poor cycle performance of batteries, etc., and achieve excellent cycle stability and good electrochemical performance. The effect of improving performance and electrochemical performance

Pending Publication Date: 2020-12-01
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems with SiOx used as a negative electrode material: 1) Poor electrical conductivity; 2) Large volume change (~200%) during cycling, and the material is easy to pulverize, resulting in poor cycle performance of the battery, which limits its commercial application
However, the cycle performance, rate performance and discharge capacity of the products obtained by this method need to be improved.

Method used

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  • Silicon oxide/carbon composite anode material and preparation method thereof and lithium ion battery
  • Silicon oxide/carbon composite anode material and preparation method thereof and lithium ion battery
  • Silicon oxide/carbon composite anode material and preparation method thereof and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0095] This embodiment prepares silicon oxide / carbon composite negative electrode material according to the following method:

[0096] 1) Mix metal silicon and silicon dioxide at a molar ratio of 1.5:1, and react under the protection of argon at a pressure below 20Pa and a temperature of 1380°C to produce silicon oxide gas, and make this gas flow at 30Pa Under the pressure below, collect the precipitated product on the low temperature zone collector, which is SiOy block, y=0.98;

[0097] 2) Use a universal pulverizer to pulverize the SiOy block obtained in 1) into a powder of about 1 mm, and then pulverize the product with a planetary ball mill to obtain silicon oxide particles with a median particle size of 6 μm; The obtained silicon oxide particles are repeatedly classified to obtain silicon oxide particles in a specific particle size range. The particle volume below μm accounts for 55% of all SiOx particles, D90=3.9μm;

[0098] 3) Put asphalt powder, polyacrylonitrile, Si...

Embodiment 2

[0113] This embodiment prepares silicon oxide / carbon composite negative electrode material according to the following method:

[0114] 1) Mix metal silicon and silicon dioxide at a molar ratio of 1:1, and react under the protection of nitrogen at a pressure below 50Pa and a temperature of 1380°C to generate silicon oxide gas, and keep the gas below 30Pa Under the pressure of , collect the precipitated product on the low temperature zone collector, which is SiOy block, y=1.02;

[0115] 2) Use a mechanical pulverizer to crush the silicon oxide block obtained in 1) into a powder of about 1 mm, and then use a horizontal ball mill to pulverize the product to obtain silicon oxide particles with a median particle size of 7 μm; classify with a multi-stage airflow The machine classifies the obtained particles to obtain silicon oxide particles in a specific particle size range. The specifications are: SiOx particles, the value of x is 0.98, the median D50 of the SiOx particles is 2.8 μm...

Embodiment 3

[0126] This embodiment prepares silicon oxide / carbon composite negative electrode material according to the following method:

[0127] 1) Mix metal silicon and silicon dioxide at a molar ratio of 1:3, and react under the protection of neon gas at a pressure below 100Pa and a temperature of 1500°C to produce silicon oxide gas, and make this gas flow at 50Pa Under the pressure below, collect the precipitated product on the low temperature zone collector, which is SiOy block, y=0.91;

[0128] 2) Use a mechanical pulverizer to crush the silicon oxide block obtained in 1) into a powder of about 1 mm, and then use a horizontal ball mill to pulverize the product to obtain silicon oxide particles with a median particle size of 4.3 μm; The classifier classifies the obtained particles to obtain silicon oxide particles in a specific particle size range. The specifications are: SiOx particles, the value of x is 1.13, the median D50 of the SiOx particles is 0.6 μm, and the particle size is...

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Abstract

The invention provides a silicon oxide / carbon composite anode material and a preparation method thereof and a lithium ion battery. The silicon oxide / carbon composite anode material is secondary particles and is mainly composed of a SiOx / C material, the SiOx / C material comprises SiOx particles and a carbon layer coating the surfaces of the SiOx particles, and the SiOx particles contain Si microcrystals. The preparation method comprises the following steps: 1) synthesizing a silicon oxide block; 2) performing crushing to obtain micro-nano-level SiOx particles; 3) mixing the micro-nano-level SiOxparticles with a carbonaceous binder; 4) performing pelleting; 5) performing modification carbonization; and 6) performing post-processing. The silicon oxide / carbon composite negative electrode material provided by the invention has the advantages of the reasonable structure, appropriate particle size distribution of the SiOx particles, good capacity, good initial coulombic efficiency, excellentrate capability and excellent cycle stability.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and relates to a battery material, in particular to a silicon oxide / carbon composite negative electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] In recent years, with the continuous development of 3C consumer electronics, power tools and energy storage equipment, lithium-ion batteries have become the preferred power source due to their high capacity, high energy density and excellent charge-discharge cycles. However, with the continuous innovation of science and technology and society, people have higher requirements for the energy storage performance of lithium-ion batteries, and the market urgently needs lithium-ion batteries to have higher energy density and longer life. At present, the actual capacity of commercialized graphite-based anode materials is close to its theoretical capacity of 372mAh / g, which seriously restricts the fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/583H01M4/48H01M4/386H01M4/625H01M10/0525H01M2004/027H01M4/62Y02E60/10H01M4/139H01M4/1395H01M4/1393H01M4/483H01M4/587C01B33/113H01M10/052C01P2004/80C01P2006/12H01M4/0471H01M4/621
Inventor 汪静伟庞春雷梁腾宇任建国岳敏
Owner BTR NEW MATERIAL GRP CO LTD
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