A kind of low-expansion silicon-carbon composite negative electrode material and preparation method thereof

A negative electrode material, silicon carbon composite technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of poor cycle and rate performance of silicon carbon materials, and achieve improved cycle and storage performance, high ionic conductivity, The effect of improving conductivity

Active Publication Date: 2022-08-05
河北坤天新能源股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention proposes a low-expansion silicon-carbon composite negative electrode material and its preparation method, which solves the problems of poor cycle and rate performance of silicon-carbon materials in the related art

Method used

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  • A kind of low-expansion silicon-carbon composite negative electrode material and preparation method thereof
  • A kind of low-expansion silicon-carbon composite negative electrode material and preparation method thereof
  • A kind of low-expansion silicon-carbon composite negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] S1, mix 3g lithium lanthanum zirconate, 3g aminated graphene TEPA, 3g γ-aminopropyltrimethoxysilane and 500g N-methylpyrrolidone to obtain a coating liquid;

[0033] S2, adding 20 g of silicon monoxide into the coating solution, and performing a hydrothermal reaction at a temperature of 150° C. and a pressure of 3 MPa for 6 hours to prepare a composite material B coated with a solid electrolyte on the surface;

[0034] S3. Mix 20 g of polyamic acid and N-methylpyrrolidone to prepare a 1% polyamic acid solution, then add 3 g of single-walled carbon nanotubes and 100 g of composite material B, and prepare a spinning solution with a concentration of 6.1 wt%;

[0035] S4. The spinning solution is sprayed onto the light plate by electrospinning, then pulverized and heated under nitrogen atmosphere to convert the polyamic acid into polyimide. The imide nanofiber membrane silicon-carbon composite material is a low-expansion silicon-carbon composite negative electrode material....

Embodiment 2

[0037] S1, mix 1g lithium lanthanum zirconate, 1g aminated graphene TEPA, 5g γ-aminopropyltriethoxysilane and 100g carbon tetrachloride to obtain a coating solution;

[0038] S2, adding 30 g of silicon monoxide into the coating liquid, and performing a hydrothermal reaction at a temperature of 150° C. and a pressure of 3 MPa for 6 hours to prepare a composite material B coated with a solid electrolyte on the surface;

[0039] S3. Mix 10 g of polyamic acid and N-methylpyrrolidone to prepare a 0.5% polyamic acid solution, then add 5 g of single-walled carbon nanotubes and 100 g of composite material B, and prepare a spinning solution with a concentration of 5.75 wt%;

[0040] S4. The spinning solution is sprayed onto the light plate by electrospinning, then pulverized and heated under nitrogen atmosphere to convert the polyamic acid into polyimide. The imide nanofiber membrane silicon-carbon composite material is a low-expansion silicon-carbon composite negative electrode materi...

Embodiment 3

[0042] S1, mix 5g lithium lanthanum zirconate, 5g aminated graphene TEPA, 1g γ-aminopropylmethyldiethoxysilane and 500g cyclohexane to obtain a coating solution;

[0043] S2, adding 50 g of silicon monoxide into the coating solution, and performing a hydrothermal reaction at a temperature of 150° C. and a pressure of 3 MPa for 6 hours to prepare a composite material B coated with a solid electrolyte on the surface;

[0044] S3, mix 30g of polyamic acid and N-methylpyrrolidone to prepare a 2% polyamic acid solution, then add 5g of single-wall carbon nanotubes, and 100g of composite material B, and prepare a spinning solution with a concentration of 9wt%;

[0045] S4. The spinning solution is sprayed onto a light plate by electrospinning, then pulverized and heated under a nitrogen atmosphere to convert the polyamic acid into polyimide. The imide nanofiber membrane silicon-carbon composite material is a low-expansion silicon-carbon composite negative electrode material.

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Abstract

The invention relates to the technical field of lithium ion battery materials, and proposes a low-expansion silicon-carbon composite negative electrode material, comprising a silicon monoxide material core and a coating layer coated on the surface of the silicon-carbon material core, the coating layer comprising: A first cladding layer arranged on the surface of the silicon carbon material core and a second cladding layer arranged on the surface of the first cladding layer, the first cladding layer is composed of materials with electronic conductivity and ionic conductivity ; The second coating layer is composed of a flexible conductive polymer material, which can effectively suppress the expansion of the material during the charging and discharging process of the material and improve the structural stability of the material; The two cladding layers are connected by chemical bonds, which improves the structural stability of the material and improves the cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to a low-expansion silicon-carbon composite negative electrode material and a preparation method thereof. Background technique [0002] Silicon carbon material has the advantages of high energy density and wide range of material sources in the first phase, and has become the preferred material for the next generation of high energy density lithium-ion batteries. Poor cycle performance and poor rate performance. [0003] One of the measures to improve the conductivity of the material is to dope the surface of the material, such as doping nitrogen atoms to improve the electron-absorbing ability of the material, thereby improving the conductivity of the material and improving the fast charging performance of the material. Although the electrical conductivity of the material is improved, the swelling of the material is still large, which affects the cycle performa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M4/624H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 宋志涛陈佐川陈经玲李四新胡志林
Owner 河北坤天新能源股份有限公司
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