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Silicon carbon negative electrode material and its preparation method, application and prepared lithium ion battery

A negative electrode material, silicon carbon technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high full-power expansion, low first-time Coulombic efficiency, low first-time reversible specific capacity, etc., and achieve low full-power expansion rate, High initial reversible specific capacity and simple preparation method

Active Publication Date: 2021-08-27
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of low initial reversible specific capacity, low initial coulombic efficiency, and high full-charge expansion of existing lithium-ion batteries, and provide a silicon-carbon negative electrode material and its preparation method, Lithium-ion batteries applied and produced

Method used

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  • Silicon carbon negative electrode material and its preparation method, application and prepared lithium ion battery
  • Silicon carbon negative electrode material and its preparation method, application and prepared lithium ion battery
  • Silicon carbon negative electrode material and its preparation method, application and prepared lithium ion battery

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Embodiment 1

[0055] Select silicon oxide with a median particle size of 4 μm (purity>99.9%, mass percentage, Beijing Shengbo Gaotai Optical Technology Co., Ltd.), aluminum metal powder with a median particle size of 1 μm (purity>99.9% mass percentage, chapter Qiu City Metal Pigment Co., Ltd.), according to the addition of metal powder 1% (metal powder accounts for the weight percentage of the total raw material), the two are fully mixed and transferred to the atmosphere furnace, the nitrogen flow is controlled to be 30sccm, and the nitrogen flow rate is 5°C / min After heating up to 700°C, react for 20 hours and then cool down to room temperature naturally; then ball mill the brown-gray block obtained from the above heat treatment to obtain particles with a particle size of 2 μm; transfer the above particles to a CVD furnace (Chemical Vapor Deposition, chemical vapor deposition furnace) , according to the design of the carbon content in the final obtained material as 4%, under the protection ...

Embodiment 2

[0057] Select silicon oxide with a median particle size of 4 μm (purity>99.9%, mass percentage, Beijing Shengbo Gaotai Optical Technology Co., Ltd.), and aluminum metal powder with a median particle size of 1 μm (purity>99.9%, mass percentage, Zhangqiu Metal Pigment Co., Ltd.), by metal powder add-on 5% (metal powder accounts for the weight percent of total raw material), the two are fully mixed and then transferred to the atmosphere furnace, the nitrogen flow is controlled to be 30sccm, with 5 ℃ / After raising the temperature to 700°C, react for 20 hours and then cool down to room temperature naturally; then ball mill the brown-gray block obtained from the above heat treatment to obtain particles with a particle size of 2 μm; transfer the above particles to a CVD furnace, and press The carbon content is 4% design, the temperature is raised to 900°C at 5°C / min under the protection of argon, and the ethylene / argon gas mixture with the ethylene content of 30% (volume ratio, Hang...

Embodiment 3

[0059] Select silicon oxide with a median particle size of 4 μm (purity>99.9%, mass percentage, Beijing Shengbo Gaotai Optical Technology Co., Ltd.), aluminum metal powder with a median particle size of 0.2 μm (purity>99.9%, mass percentage , Zhangqiu Metal Pigment Co., Ltd.), according to the amount of metal powder added 1% (metal powder accounts for the weight percentage of the total raw material), the two are fully mixed and then transferred to the atmosphere furnace. / min After heating up to 700°C, react for 20 hours and then cool down to room temperature naturally; then ball mill the brown-gray block obtained from the above heat treatment to obtain particles with a particle size of 2 μm; transfer the above particles to a CVD furnace, press the final material The carbon content is designed to be 4%, and the temperature is raised to 900°C at 5°C / min under the protection of argon, and then switched to an ethylene / argon gas mixture with an ethylene (Hangzhou Jingong Gas Co., L...

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Abstract

The invention discloses a silicon-carbon negative electrode material, a preparation method thereof, an application thereof and a lithium ion battery prepared therefrom. The preparation method includes the following steps: heat-treating and crushing the mixture under a nitrogen atmosphere to obtain particles with a median diameter of 1-10 μm; the mixture includes silicon oxide and aluminum powder, and the median diameter of silicon oxide and aluminum powder is The particle size ratio is 0.2-80, and the weight percentage of aluminum powder in the mixture is 1-20%; the gaseous carbon source and the obtained particles are subjected to vapor deposition reaction, and the silicon-carbon negative electrode material is obtained after cooling; the carbon content of the silicon-carbon negative electrode material is 0.5 ~10 wt%. The carbon-silicon negative electrode material of the present invention has a uniform crystal phase distribution and few impurity phases, and the lithium-ion battery prepared by having better electrical conductivity has a higher first-time reversible specific capacity, a higher first-time Coulombic efficiency, and a lower Excellent full charge expansion rate and high 50-week capacity retention rate. The preparation method of the invention is simple, low in cost and easy to realize large-scale production.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a silicon-carbon negative electrode material, a preparation method, an application thereof, and a prepared lithium-ion battery. Background technique [0002] The development and research of new high-capacity power battery anode materials can solve the short board of the current electric vehicle (EV) cruising range, which is conducive to the further promotion of new energy vehicles. The silicon oxide material contains silicon oxide compounds, and the Li generated during the lithium intercalation process 4 SiO 4 It can be used as a buffer substance, so it is generally believed that its cycle characteristics as an anode material are better than pure silicon. However, it is also due to the fact that the reaction between the silicon oxide compound and lithium ions consumes part of the lithium in the positive electrode, so the low initial charge and discharge efficiency (ie, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 马飞吴玉虎魏良勤沈龙
Owner SHANGHAI SHANSHAN TECH CO LTD
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