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Sulfur-doped pre-lithiated silicon-carbon composite material and preparation method thereof

A technology of carbon composite materials and pre-lithiated silicon, which is applied in the field of sulfur-doped pre-lithiated silicon-carbon composite materials and its preparation, can solve problems such as poor structural stability, poor cycle performance, and poor electronic conductivity, and achieve structural stability High performance, high specific capacity, and improved electronic conductivity

Active Publication Date: 2020-10-02
石家庄尚太科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In view of the current silicon-carbon materials with poor electronic conductivity, poor structural stability caused by expansion during cycling, and poor cycle performance, the present invention forms lithium silicate by doping organic sulfur and organic lithium in silicon monoxide. While improving the first-time efficiency of the material, the "—Li-S—" structure is formed at the same time to improve the structural stability and specific capacity of the material, and improve the cycle performance of the material

Method used

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  • Sulfur-doped pre-lithiated silicon-carbon composite material and preparation method thereof
  • Sulfur-doped pre-lithiated silicon-carbon composite material and preparation method thereof
  • Sulfur-doped pre-lithiated silicon-carbon composite material and preparation method thereof

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Embodiment 1

[0026] This embodiment provides a method for preparing a sulfur-doped pre-lithiated silicon-carbon composite material, comprising the following steps:

[0027] (1) 10g methionine is added to the 100g graphene oxide N-methylpyrrolidone solution with a concentration of 0.5wt.%, and the solution a is obtained after uniform stirring; wherein, the common proportion of hydroxyl and carboxyl groups in graphene oxide is 1%.

[0028] (2) Add 3g of tert-butyllithium and 100g of N-methylpyrrolidone solvent to solution a obtained in step (1), seal and stir to obtain solution b;

[0029] (3) Add 100g of silicon monoxide to 300g of solution b and stir evenly, then transfer to a high-pressure reactor, and react at 180°C and 3Mpa for 12h, then filter and dry at 80°C for 12h to obtain a composite material Intermediate;

[0030] (4) Transfer the composite material intermediate obtained in step (3) to a tube furnace, and in an argon inert atmosphere, heat up to 900°C at a heating rate of 5°C / m...

Embodiment 2

[0032] This embodiment provides a method for preparing a sulfur-doped pre-lithiated silicon-carbon composite material, comprising the following steps:

[0033] (1) Add 10g cysteine ​​to the 100g graphene oxide N-methylpyrrolidone solution with a concentration of 0.1wt.%, and stir uniformly to obtain solution a; wherein, the common proportion of hydroxyl and carboxyl in graphene oxide is 0.5%.

[0034] (2) Add 1g of lithium n-butoxide and 100g of carbon tetrachloride solvent to solution a obtained in step (1), and obtain solution b after sealing and stirring;

[0035] (3) Add 100g of silicon monoxide to 100g of solution b and stir evenly, then transfer to a high-pressure reactor, and react at 100°C and 1Mpa for 24h, then filter and dry at 80°C for 12h to obtain a composite material Intermediate;

[0036] (4) Transfer the composite material intermediate obtained in step (3) to a tube furnace, and in an argon inert atmosphere, heat up to 800°C at a heating rate of 5°C / min for c...

Embodiment 3

[0038] This embodiment provides a method for preparing a sulfur-doped pre-lithiated silicon-carbon composite material, comprising the following steps:

[0039] (1) Add 10g of 2-mercaptoethanol to a 100g graphene oxide N-methylpyrrolidone solution with a concentration of 1wt.%, and stir uniformly to obtain solution a; wherein, the proportion of hydroxyl and carboxyl groups in graphene oxide is 2 %.

[0040] (2) Add 5g of n-butyllithium and 100g of tetrahydrofuran solvent to solution a obtained in step (1), seal and stir to obtain solution b;

[0041] (3) Add 100g of silicon monoxide to 500g of solution b and stir evenly, then transfer to a high-pressure reactor, and react at 200°C and 5Mpa for 1h, then filter and dry at 80°C for 12h to obtain a composite material Intermediate;

[0042] (4) Transfer the composite material intermediate obtained in step (3) to a tube furnace, and in an argon inert atmosphere, heat up to 1100°C at a heating rate of 5°C / min for carbonization for 1...

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Abstract

The invention relates to a sulfur-doped pre-lithiated silicon-carbon composite material and a preparation method thereof. The preparation method comprises the following steps of adding an organic sulfur compound into a graphene oxide solution, and uniformly stirring to obtain a solution a; adding organic lithium and an organic solvent into the solution a, sealing and uniformly stirring to obtain asolution b; adding silicon monoxide into the solution b, uniformly stirring, heating and pressurizing for reaction, filtering, and drying to obtain a composite material intermediate; and placing thecomposite material intermediate in an inert atmosphere to carbonize, thereby obtaining the sulfur-doped pre-lithiated silicon-carbon composite material. According to the invention, the organic sulfurand organic lithium are doped in silicon monoxide, a -Li-S- structure and a -CO-NH- structure are formed while lithium silicate is formed to improve the first efficiency of the material, so that the structural stability and specific capacity of the material and the cycle performance of the material are improved.

Description

technical field [0001] The invention belongs to the field of lithium ion battery preparation, and in particular relates to a sulfur-doped pre-lithiated silicon-carbon composite material and a preparation method thereof. Background technique [0002] With the improvement of energy density requirements of lithium-ion batteries, anode materials are required to have high energy density and electrochemical performance, and silicon carbon materials are used in the field of high energy density batteries due to their high specific capacity, but their silicon carbon materials Its own disadvantages such as poor electrical conductivity, large expansion, low initial efficiency and poor circulation limit its application. Contents of the invention [0003] In order to solve the problems existing in the prior art, the present invention provides a sulfur-doped pre-lithiated silicon-carbon composite material and a preparation method thereof. Aiming at the defects of current silicon-carbon...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/362H01M4/483H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 许晓落庞成志魏智伟安静
Owner 石家庄尚太科技股份有限公司
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