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Preparation method and application of novel carbon and silicon-based composite material

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 unrealized commercial production, high difficulty, low output, etc., and achieve excellent The degree of graphitization, the increase of added value, and the effects of a wide range of sources

Inactive Publication Date: 2018-08-21
王立勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It not only alleviates the expansion-contraction effect of silicon, but also improves the overall conductivity of the material, thereby improving the cycle life and high specific capacity of the electrode material, meeting the inherent requirements of the negative electrode material of lithium-ion batteries, and is expected to surpass the performance of graphite negative electrode materials. A new generation of lithium-ion battery anode materials, but most of the existing silicon-based and other new lithium-ion battery anode materials are prepared by harsh and difficult nanotechnology, the output is low, and commercial production has not yet been realized

Method used

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  • Preparation method and application of novel carbon and silicon-based composite material
  • Preparation method and application of novel carbon and silicon-based composite material
  • Preparation method and application of novel carbon and silicon-based composite material

Examples

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Embodiment 1

[0030] A preparation method of a novel carbon-silicon-based composite material, the specific steps are as follows:

[0031] S1. Add 8 g of sucrose to 200 mL of distilled water to obtain an aqueous sucrose solution with a concentration of 0.04 g / mL;

[0032] S2. Add 0.1 g of silicon powder to 20 mL of the sucrose aqueous solution obtained in S1, and disperse evenly by ultrasonic waves. Place the dispersed solution in a porcelain boat, stir for 12 h, and preliminarily dry at room temperature for 8 h to obtain a reactant;

[0033] S3. Calcining the reactant obtained in S2 in a tube furnace at 1173K for 2 hours in a high-purity nitrogen atmosphere, after washing and centrifuging, drying in a vacuum oven at 373K for 8 hours to obtain a primary carbon-silicon composite material;

[0034] S4. Add 0.1 g of graphite fibers to 0.1 g of primary carbon-silicon composite material obtained in S3, disperse uniformly in an ethanol solution by ultrasonic, stir for 4 h, and dry at room temperat...

Embodiment 2

[0036] A preparation method of a novel carbon-silicon-based composite material, the specific steps are as follows:

[0037] S1. Add 3.2 g of sucrose to 200 mL of distilled water to obtain an aqueous sucrose solution with a concentration of 0.016 g / mL;

[0038] S2. Add 0.1 g of silicon powder to 50 mL of the sucrose aqueous solution obtained in S1, disperse evenly by ultrasonic, place the dispersed solution in a porcelain boat, stir for 15 h, and preliminarily dry at room temperature for 12 h to obtain a reactant;

[0039] S3. Calcining the reactant obtained in S2 in a tube furnace at 1123K for 2.5 hours in a high-purity nitrogen atmosphere, after washing and centrifuging, drying in a vacuum oven at 373K for 10 hours to obtain a primary carbon-silicon composite material;

[0040] S4. Add 0.12g of graphite fibers to 0.24g of the primary carbon-silicon composite material obtained in S3, disperse uniformly in an ethanol solution by ultrasonic, stir for 11 hours, and dry at room te...

Embodiment 3

[0042] A preparation method of a novel carbon-silicon-based composite material, the specific steps are as follows:

[0043] S1. Add 6 g of sucrose to 300 ml of distilled water to obtain an aqueous solution of sucrose with a concentration of 0.02 g / mL;

[0044] S2. Add 0.1g of silicon powder to 80mL of the sucrose aqueous solution obtained in S1, and disperse evenly in the ethanol solution by ultrasonic, put the dispersed solution in a porcelain boat, stir for 12h, and preliminarily dry at room temperature for 8h to obtain the reactant ;

[0045] S3. Calcining the reactant obtained in S2 in a tube furnace at 1273K for 2 hours in a high-purity nitrogen atmosphere, after washing and centrifuging, drying in a vacuum oven at 363K for 12 hours to obtain a primary carbon-silicon composite material;

[0046]S4. Add 0.6 g of graphite fibers to 0.3 g of the primary carbon-silicon composite material obtained in S3, disperse uniformly by ultrasonic, stir for 10 h, and dry at room tempera...

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Abstract

The invention discloses a preparation method and application of a novel carbon and silicon-based composite material. The method comprises the following steps: mixing saccharose and silicon powder; primarily drying for 8-12h under room temperature; roasting for 2-3h in nitrogen atmosphere under 773-1473K to obtain a primary carbon-silicon composite material; combining the primary carbon-silicon composite material and graphite fibers to obtain the carbo and silicon-based composite material. The preparation method is low in cost, simple to operate, and wide in raw material source; generation of toxic gas is avoided in the preparation processes; in addition, the prepared carbon-silicon-based composite material is stable in performance and outstanding in circulating performance when being applied to a lithium battery negative electrode material and has a god industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a preparation method and application of a novel carbon-silicon-based composite material. Background technique [0002] Commercial lithium-ion battery anode materials are generally currently graphite materials are still the main force in the field of anode materials. There are many types of graphite materials, including natural flake graphite, artificial graphite and fibrous carbon materials (with graphite structure). The non-renewable natural flake graphite has a natural graphite structure, and after high temperature treatment, it can be directly used as the negative electrode material of lithium-ion batteries. Artificial graphite is generally made of natural flake graphite as aggregate, combined with other materials through hot pressing process. After a long cycle, the lithium storage capacity of natural flake graphite and artificial graphite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 王立勇
Owner 王立勇
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