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Preparation method of silicon-carbon negative electrode material

A negative electrode material, silicon carbon technology, applied in the field of preparation of silicon carbon negative electrode materials, can solve the problems of uneven dispersion of silicon materials, easy pulverization of silicon particles, weak silicon-carbon bonding strength, etc., to overcome uneven dispersion, Stable product quality and high degree of effect

Inactive Publication Date: 2020-09-22
吉林聚能新型炭材料股份有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is, by providing a preparation method of a silicon-carbon negative electrode material, to overcome the problems in the prior art caused by the uneven dispersion of silicon materials, the tendency of larger silicon particles to be powdered, and the weak silicon-carbon bonding strength. Technical deficiencies and defects such as structural stripping

Method used

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  • Preparation method of silicon-carbon negative electrode material
  • Preparation method of silicon-carbon negative electrode material

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preparation example Construction

[0023] A method for preparing a silicon-carbon negative electrode material, comprising the steps of:

[0024] S1. Mixing: mix silicon powder and graphite powder, and use mechanical stirring to obtain evenly mixed mixed powder;

[0025] S2. High temperature treatment: put the mixed powder in the high temperature treatment device, and carry out multi-stage vacuuming treatment on the high temperature treatment device, so that the pressure value in the high temperature treatment device reaches 50Pa-100Pa, and raise the temperature inside the device to 1000°C-1500°C , and keep it warm for 1-3 hours, then pass inert gas into the high-temperature treatment device until the pressure value reaches 0.4MPa-0.8MPa, continue to keep warm for 2-4 hours, and carry out pressure impregnation treatment on the mixed powder to make the silicon in the mixed powder The powder is melted to obtain nano-silicon, which is evenly distributed in the graphite powder, and combined with the graphite powder ...

Embodiment 1

[0033] S1. Mixing: Mix the monocrystalline silicon powder and the natural graphite powder according to the ratio of 5:95, use mechanical stirring for 2 hours, and the rotating speed of the stirring rod is 15r / min, to obtain a uniformly mixed powder;

[0034] S2. High-temperature treatment: put the mixed powder in a high-temperature treatment device, and perform multi-stage vacuum treatment on the high-temperature treatment device, so that the pressure value in the high-temperature treatment device reaches 50 Pa, raise the temperature in the device to 1000 ° C, and keep it warm for 1 hour , and then pass inert gas into the high-temperature treatment device until the pressure value reaches 0.4MPa, continue to keep warm for 2 hours, and carry out pressure impregnation treatment on the mixed powder to melt the silicon powder in the mixed powder to obtain nano-silicon, which is evenly distributed on the graphite In the powder, combine with graphite powder to form a silicon-carbon st...

Embodiment 2

[0037] S1. Mixing: Mix monocrystalline silicon powder and artificial graphite powder according to the ratio of 20:80, use mechanical stirring for 3 hours, and the rotating speed of the stirring rod is 20r / min, to obtain a uniformly mixed powder;

[0038] S2. High temperature treatment: put the mixed powder in the high temperature treatment device, and carry out multi-stage vacuuming treatment on the high temperature treatment device, so that the pressure value in the high temperature treatment device reaches 80Pa, raise the temperature in the device to 1300°C, and keep it warm for 2 hours , and then pass argon gas into the high-temperature treatment device until the pressure value reaches 0.6MPa, continue to keep warm for 3 hours, and carry out pressure impregnation treatment on the mixed powder to melt the silicon powder in the mixed powder to obtain nano-silicon, which is evenly distributed on the graphite In the powder, combine with graphite powder to form a silicon-carbon s...

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Abstract

The invention provides a preparation method of a silicon-carbon negative electrode material. The method comprises the following steps: performing mixing, high-temperature treatment and carbon coating.According to the method provided by the invention, in the obtained silicon-carbon negative electrode material, the silicon material is uniformly distributed in the graphite particles and is tightly combined with the carbon particles, so the silicon-carbon bonding strength is relatively high, and the technical defects of non-uniform dispersion of the silicon material, easy pulverization of relatively large silicon particles, easy stripping of a silicon-carbon structure caused by weak silicon-carbon bonding strength and the like in the prior art are overcome; in the obtained silicon-carbon negative electrode material, the content of nano silicon can reach (5-50)%, so the gram specific capacity, efficiency and recycling times of the silicon-carbon negative electrode material are effectivelyimproved; meanwhile, the method provided by the invention has the advantages of simple steps, wide material requirements and high achievable degree in industrial production, and the obtained product has stable quality.

Description

technical field [0001] The invention relates to the field of preparation of negative electrode materials for lithium batteries, in particular to a method for preparing silicon carbon negative electrode materials. Background technique [0002] With the adjustment of the national policy on new energy vehicles and the higher requirements of new energy vehicle companies on the energy density of batteries, it is urgent to increase the gram-specific capacity of lithium battery anode materials to achieve the above goals. Therefore, the research on lithium battery anode materials is shifting towards high capacity, high rate, long cycle and low price. At present, among the anode materials for lithium-ion batteries on the market, graphite-based carbon materials still occupy a dominant position. However, because the research on the gram specific capacity of traditional graphite anode materials is close to the limit, it is impossible to greatly increase the energy density of lithium bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCH01M4/362H01M4/366H01M4/386H01M4/587H01M4/625H01M10/0525B82Y30/00Y02E60/10
Inventor 王占武王钊
Owner 吉林聚能新型炭材料股份有限公司
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