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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 the field of silicon carbon negative electrode material and its preparation, can solve the problems of low low temperature discharge performance, low lithium intercalation rate performance, complicated preparation steps, etc., and achieves improved low temperature charge and discharge performance, low cost, The effect of simple process

Active Publication Date: 2022-02-01
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects of low lithium intercalation rate performance, low low temperature discharge performance, damage to the surface of the material after carbon coating, high cost and complicated preparation steps in the negative electrode material of lithium ion batteries in the prior art, providing A silicon-carbon negative electrode material and its preparation method, application and prepared lithium-ion battery

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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

[0051] Silicon oxide (purity>99.9%, said % is mass percent, Beijing Shengbo Gaotai Optical Technology Co., Ltd.) material with a median particle size of 5 μm was selected, and acetylene (Suzhou Jinhong) was used as the coating carbon source. Firstly, silicon oxide was heated to 1000°C under nitrogen condition at 5°C / min and then stabilized for 3 hours; the silicon oxide raw material after the above treatment was put into a horizontal heating reactor, and the nitrogen flow rate was kept at 50 sccm, and the nitrogen flow rate was 5°C / min. Min is heated to 800°C, and then the carbon source gas is introduced (the volume concentration of the carbon source gas acetylene in the total gas is 5%, and the introduction time is designed according to the carbon content of the final sample obtained as 1.5wt.%). After the end, switch to pure Nitrogen (50sccm) and lower the temperature to 400°C; flow a mixed gas of oxygen:nitrogen=1:9 (volume ratio) for 2 hours, switch to nitrogen (100sccm) af...

Embodiment 2

[0053] Silicon oxide (purity>99.9%, said % is mass percent, Beijing Shengbo Gaotai Optical Technology Co., Ltd.) material with a median particle size of 5 μm was selected, and acetylene (Suzhou Jinhong) was used as the coating carbon source. Firstly, silicon oxide was heated to 1000°C under nitrogen condition at 5°C / min and then stabilized for 3 hours; the silicon oxide raw material after the above treatment was put into a horizontal heating reactor, and the nitrogen flow rate was kept at 50 sccm, and the nitrogen flow rate was 5°C / min. Min is heated to 800°C, and then the carbon source gas is introduced (the volume concentration of the carbon source gas acetylene in the total gas is 5%, and the introduction time is designed according to the carbon content of the final sample obtained as 1.5wt.%); after the end, switch to pure Nitrogen (50sccm) and lower the temperature to 500°C, pass through a mixed gas of oxygen / nitrogen = 1:9 (volume ratio) for 2 hours, switch to nitrogen (1...

Embodiment 3

[0055] Silicon oxide (purity>99.9%, said % is mass percent, Beijing Shengbo Gaotai Optical Technology Co., Ltd.) material with a median particle size of 5 μm was selected, and acetylene (Suzhou Jinhong) was used as the coating carbon source. Firstly, silicon oxide was heated to 1000°C under nitrogen condition at 5°C / min and then stabilized for 3 hours; the silicon oxide raw material after the above treatment was put into a horizontal heating reactor, and the nitrogen flow rate was kept at 50 sccm, and the nitrogen flow rate was 5°C / min. Min is heated to 800°C, and then the carbon source gas is introduced (the volume concentration of the carbon source gas acetylene in the total gas is 5%, and the introduction time is designed according to the carbon content of the final sample obtained as 1.5wt.%); after the end, switch to pure Nitrogen (50sccm) and lower the temperature to 550°C, pass through a mixed gas of oxygen / nitrogen = 1:9 (volume ratio) for 4 hours, switch to nitrogen (1...

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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 comprises the following steps: carrying out vapor phase deposition reaction of silicon oxide with a median particle size of 1-10 μm and a gaseous carbon source; passing in a mixed gas for oxidation reaction, and cooling under an inert atmosphere to obtain silicon carbon The negative electrode material; the mixed gas contains oxidizing gas, and the volume ratio of the oxidizing gas to the mixed gas is 1-90%; the carbon content in the silicon-carbon negative electrode material is 1-10wt%. The surface of the silicon-carbon negative electrode material of the present invention has a good pore size distribution and a uniform surface carbon layer; while the lithium-ion battery prepared by using the silicon-carbon negative electrode material of the present invention maintains a high capacity, its lithium intercalation rate performance, low-temperature lithium intercalation The delithiation performance is improved; the preparation method of the invention has low cost, simple process and easy mass 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] In recent years, the market of new energy vehicles has gradually expanded. In order to adapt to different environments and the needs of fast charging, there is an urgent market demand for the development of anode materials with high capacity and certain rate and low temperature performance. [0003] Chinese invention patent application CN 108807952A discloses a method for preparing a nano-silicon oxide / ferrous oxide composite negative electrode material for a lithium-ion battery. After mixing nano-silicon, nano-silicon oxide, and nano-ferrous oxide, it is coated on the surface by chemical vapor deposition. Mixing, and then ball milling to obtain nano-scale carbonized composite material, and then adding deionized water to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/48H01M4/62H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 马飞刘冬冬沈龙丁晓阳
Owner SHANGHAI SHANSHAN TECH CO LTD
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