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Carbon-silicon composite material, and preparation method and application thereof

A technology of silicon composite materials and composite materials, applied in nanotechnology for materials and surface science, active material electrodes, electrical components, etc., can solve the problems of high volume expansion rate, uniform distribution, and degradation of cycle performance of materials

Inactive Publication Date: 2017-06-13
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can produce nano-silicon with high specific capacity, but the silicon cannot be uniformly distributed on all surfaces of the carbon substrate, resulting in hidden dangers such as degradation of cycle performance and high volume expansion rate of the material.

Method used

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  • Carbon-silicon composite material, and preparation method and application thereof
  • Carbon-silicon composite material, and preparation method and application thereof
  • Carbon-silicon composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) Get 120g ferric chloride hexahydrate, 75mL concentrated hydrochloric acid and add 1725mL deionized water and fully stir until clarification prepares ferric chloride solution, then add 60g polyethylene glycol and fully stir until dissolved to obtain polyethylene glycol and ferric chloride Dispersions.

[0063] (2) Take 900g of natural flake graphite and add it to the dispersion liquid obtained in step (1) to fully infiltrate it, stir it evenly, and then dry it to obtain a base material for catalytic metal surface interface modification.

[0064] (3) Add the base material modified by the catalytic metal surface interface in step (2) into a rotary CVD furnace, heat to 750°C under the protection of nitrogen, and then use nitrogen at a flow rate of 3.5L / min as a carrier gas, and use 5L / min The speed of min is passed through the heated and vaporized trichlorosilane, and the carbon-silicon composite material is obtained after reacting for 3 hours.

[0065] (4) The carbon-...

Embodiment 2

[0074] (1) Take 201g of copper chloride dihydrate and 75mL of concentrated hydrochloric acid and add 1725mL of deionized water to fully stir until clarified to prepare a copper chloride solution, then add 20g of glucose and fully stir until dissolved to obtain a dispersion of glucose and copper chloride.

[0075] (2) Take 900g of natural spherical graphite and add it to the dispersion obtained in step (1) to fully infiltrate it, stir it evenly, and then dry it to obtain a base material for catalytic metal surface interface modification.

[0076] (3) Add the substrate material modified by the catalytic metal surface interface in step (2) into a rotary CVD furnace, heat it to 550°C under the protection of argon, and then use nitrogen at a flow rate of 3.5L / min as a carrier gas, and use 5L A certain amount of monosilane was introduced at a speed of 1 / min, and the carbon-silicon composite material was obtained after 1.5 hours of reaction.

[0077] (4) The carbon-silicon composite ...

Embodiment 3

[0085] (1) Add 202g of copper acetate monohydrate and 25mL of concentrated hydrochloric acid into 1350mL of deionized water and stir until clarified to prepare a copper acetate solution, then add 20g of polyvinylpyrrolidone and stir until dissolved to obtain a dispersion of polyvinylpyrrolidone and copper acetate.

[0086] (2) Take 900g of conductive graphite and add it to the dispersion liquid obtained in step (1) to fully infiltrate it, stir it evenly, and then dry it to obtain a base material for catalytic metal surface interface modification.

[0087] (3) Add the base material modified by the catalytic metal surface interface in step (2) into a rotary CVD furnace, heat it to 550°C under the protection of argon, and then use nitrogen at a flow rate of 3.5L / min as a carrier gas to A certain amount of monosilane was introduced at a rate of 6 L / min, and a carbon-silicon composite material was obtained after 3 hours of reaction.

[0088] (4) Adopt asphalt as binder to carry out...

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Abstract

The invention relates to a carbon-silicon composite material, a preparation method thereof and an application in a lithium ion battery. The carbon-silicon composite material provided by the invention comprises a carbon substrate, a catalyst and nanometer silicon grains and / or a silicon film uniformly attached to the carbon substrate. The method comprises the following steps: 1) preparing dispersion liquid of an organic additive and the catalyst; 2) uniformly mixing the carbon substrate with the dispersion liquid and then drying, thereby modifying the surface interface of the carbon substrate with the catalyst; and 3) transferring the carbon substrate modified with the catalyst into a CVD furnace, increasing the temperature under a protective atmosphere till reaching the reaction temperature, then introducing a silicon source for reacting, and uniformly attaching the nanometer silicon grains and / or the silicon film generated by catalytic decomposition to the surface interface of the carbon substrate, thereby obtaining the carbon-silicon composite material. The method provided by the invention has easiness in large-scale preparation; the silicon carbon compounding degree of the product is high; and the carbon-silicon composite material is an excellent negative electrode material for the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of new negative electrode materials for lithium-ion batteries, and relates to a carbon-silicon composite material, its preparation method and application, in particular to a carbon-silicon composite material, a preparation method using metal-catalyzed chemical vapor deposition and its application in lithium-ion batteries the use of. Background technique [0002] Lithium-ion batteries have great application prospects and extensive demands in the fields of mobile electronic devices, electric vehicles, and large-scale energy storage. The negative electrode materials selected for traditional lithium-ion battery systems are mainly graphite materials. The theoretical specific capacity of graphite materials is low, only 372mAh g -1 , it is difficult to meet the high energy density requirements of new lithium-ion batteries. Therefore, it is very important to develop new anode materials for high-capacity lithium-ion batteri...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 孔一鸣任建国
Owner BTR NEW MATERIAL GRP CO LTD
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