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Silicon-carbon composite material as well as preparation method and application thereof

A silicon-carbon composite material and nano-silicon technology, applied in active material electrodes, electrical components, electrochemical generators, etc., can solve the problem of high cost of negative electrode silicon-carbon materials, and achieve high consistency, high purity, and high specific surface area. Effect

Active Publication Date: 2020-09-18
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of lithium-ion secondary battery negative electrode silicon-carbon material obtained by the method is high

Method used

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  • Silicon-carbon composite material as well as preparation method and application thereof
  • Silicon-carbon composite material as well as preparation method and application thereof
  • Silicon-carbon composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A method for preparing a silicon-carbon composite material includes the following steps:

[0058] (1) Preparation of porous nano silicon:

[0059] Use a disc chipper to eliminate scrap solar silicon panels to a particle size of 800μm, and then mechanically sand and classify to obtain nano-silicon with a particle size of 100nm, and then use ethanol and deionized water (volume ratio 1 1) Carry out ultrasonic cleaning, filtration, then transfer to 0.1mol / L hydrofluoric acid to soak for 12h, clean with deionized water, and dry to obtain porous nano silicon;

[0060] (2) Preparation of silicon-carbon composite materials:

[0061] Add 1g of vinyl triethoxysilane to 20mL of carbon tetrachloride organic solvent to prepare a solution, then add 3g of porous nano-silicon, 1g of polyethylene glycol and 1g of silicon chloride and mix well, ultrasonically disperse for 6h, then filter The solid product is transferred to the tube furnace;

[0062] Calcining: In an inert atmosphere, the tempera...

Embodiment 2

[0065] A method for preparing a silicon-carbon composite material includes the following steps:

[0066] (1) Preparation of porous nano silicon:

[0067] Use a disc chipper to eliminate scrap solar silicon panels to a particle size of 500μm, and then mechanically sand and classify to obtain nano-silicon with a particle size of 50nm, and then use ethanol and deionized water (volume ratio 1:1) Carry out ultrasonic cleaning, filtration, then transfer to 0.5mol / L hydrofluoric acid to soak for 1h, clean with deionized water, and dry to obtain porous nano silicon;

[0068] (2) Preparation of silicon carbon composite material:

[0069] Add 0.5g of vinyl trimethoxysilane to 50mL of N-methylpyrrolidone organic solvent to prepare a solution, then add 1g of porous nano-silicon, 0.5g of polyvinyl alcohol and 0.5g of silicon tetrabromide, mix well, and ultrasonically disperse for 1h , Then filter the solid product and transfer it to the tube furnace;

[0070] Calcining: In an inert atmosphere, the...

Embodiment 3

[0072] A method for preparing a silicon-carbon composite material includes the following steps:

[0073] (1) Preparation of porous nano silicon:

[0074] Use a disc chipper to eliminate scrap solar silicon panels to a particle size of 1000μm, then mechanically sand and classify to obtain nano-silicon with a particle size of 200nm, and then use ethanol and deionized water (volume ratio 1:1) Carry out ultrasonic cleaning and filtration, then transfer to 0.1mol / L hydrofluoric acid to soak for 24h, and use deionized water to clean and dry to obtain porous nano silicon;

[0075] (2) Preparation of silicon carbon composite material:

[0076] Add 2g vinyl tris(β-methoxyethoxy) silane to 200mL N,N-dimethylformamide organic solvent to prepare a solution, then add 5g porous nano silicon, 2g polyvinyl alcohol and 2g chlorinated After the silicon is uniformly mixed, it is ultrasonically dispersed for 12 hours, then filtered, and transferred to the tube furnace;

[0077] Calcining: In an inert atm...

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Abstract

The invention relates to a silicon-carbon composite material as well as a preparation method and application thereof. The method comprises the steps of (1) carrying out mechanical force treatment on ascrapped solar panel to obtain nano-silicon, and then carrying out chemical corrosion on the nano-silicon to obtain porous nano-silicon; (2) preparing a dispersion liquid containing the porous nano silicon and a silane coupling agent, and filtering the dispersion liquid; and (3) calcining the solid product obtained by filtering in the step (2) in an inert atmosphere to obtain the silicon-carbon composite material. According to the invention, the low-cost scrapped solar silicon panel is adopted for treatment to obtain the porous nano silicon; then the porous nano silicon reacts with a silane coupling agent under a high-temperature condition to prepare a silicon-carbon composite material; a synergistic effect is generated between the silane coupling agent and the nano-silicon, namely the surface of the silane coupling agent is hydrolyzed on the surface of the nano-silicon to generate silicon hydroxyl, and electrons are adsorbed by the silicon-carbon composite material to generate a complex with a stable structure, thereby improving the electrochemical performance of the lithium ion battery.

Description

Technical field [0001] The invention belongs to the technical field of batteries, and specifically relates to a silicon-carbon composite material, a preparation method and application thereof. Background technique [0002] According to the national new energy vehicle development plan, the new energy vehicle industry has put forward higher requirements for the energy density of lithium-ion batteries. For lithium-ion batteries, the negative electrode material is an important component and an important factor affecting the energy density of the battery. [0003] The current market-oriented anode materials are mainly graphite materials, but the low gram capacity of graphite materials limits the increase in the energy density of lithium-ion batteries. The silicon anode material has attracted the attention of researchers due to its high gram capacity and rich resources, and has been used in high specific energy density lithium-ion batteries and other fields. However, the high expansion...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/587H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 赵晓锋
Owner SVOLT ENERGY TECHNOLOGY CO LTD