Carbon-silicon composite material and preparation method and application thereof

A composite material, carbon-silicon composite technology, applied in the direction of electrode manufacturing, electrode heat treatment, electrical components, etc., can solve the problems of no scalability, cumbersome synthesis process, complicated process, etc., and achieve excellent charge-discharge specific capacity and cycle stability The effect of high stability, simple preparation process and low energy consumption

Active Publication Date: 2017-09-26
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are some modified binders that can improve part of the performance of silicon negative electrodes to a certain extent, the synthesis process of these modified binders is cumbersome, complicated, and costly, and they are not scalable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this embodiment, the carbon-silicon composite material is prepared by the following method, which specifically includes the following steps:

[0038] (1) Silicon nanomaterials, graphene oxides and sodium alginate converted from silicon fume produced in the process of industrial smelting metal silicon and iron-silicon alloys are mixed in water (mass percentage of silicon nanomaterials and graphene oxides The sum is 90wt%, the mass ratio of silicon nanomaterials and graphene oxide is 3:1), and its carbon-silicon composite macroscopic film is prepared by scraping method;

[0039] (2) After the carbon-silicon composite macroscopic body obtained in step (1) was heat-treated for 2 hours at 450° C. under an argon atmosphere, a covalent carbon network-based carbon-silicon composite material was obtained, wherein the weight percentage of silicon was 75 wt%.

[0040] The above-mentioned covalent carbon network-based carbon-silicon composite material is used as the test electro...

Embodiment 2

[0042] In this embodiment, the carbon-silicon composite material is prepared by the following method, which specifically includes the following steps:

[0043] (1) Mix silicon nanomaterials, carbon nanotubes and polyvinylidene fluoride, which are converted from silicon fume produced during industrial smelting of metal silicon and iron-silicon alloys, in N-methylpyrrolidone (silicon nanomaterials and carbon nano The sum of the mass concentrations of the tubes is 99wt%, and the mass ratio of silicon nanomaterials and graphene oxide is 9:1), and its carbon-silicon composite macroscopic block is prepared by a drop-coating method;

[0044] (2) After heat-treating the carbon-silicon composite macroscopic block obtained in step (1) under a hydrogen atmosphere at 950° C. for 10 seconds, a covalent carbon network-based carbon-silicon composite electrode was prepared, wherein the weight percentage of silicon was 95 wt%.

[0045] The above-mentioned covalent carbon network-based carbon-s...

Embodiment 3

[0047] In this embodiment, the carbon-silicon composite material is prepared by the following method, which specifically includes the following steps:

[0048] (1) Silicon nanomaterials, carbon fibers derived from bacterial cellulose and sodium carboxymethyl cellulose, which are converted from silica fume produced in the industrial smelting of metal silicon and iron-silicon alloys, are mixed in water (silicon nanomaterials and bacterial fibers The mass concentration sum of the carbon fibers derived from the prime is 60wt%, and the mass ratio of silicon nanomaterials and graphene oxide is 4:1), and its carbon-silicon composite macroscopic film is prepared by spin-coating method;

[0049] (2) After heat-treating the macroscopic film obtained in step (1) for 5 hours under an argon / hydrogen mixed atmosphere at 700° C., a covalent carbon network-based carbon-silicon composite electrode was prepared, wherein the weight percentage of silicon was 50 wt%.

[0050] The above-mentioned c...

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PUM

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Abstract

The invention provides a carbon-silicon composite material and a preparation method and application thereof. The preparation method includes following steps: dispersing a silicon nanomaterial, a carbon nanomaterial and a binder into a solvent to form size, and preparing to obtain carbon-silicon composite macro body; thermally treating the obtained carbon-silicon composite macro body in a non-oxidative atmosphere to obtain the carbon-silicon composite material. The carbon-silicon composite material has a covalent carbon grid structure, and the silicon nanomaterial is embedded in the covalent carbon grid structure, so that the carbon-silicon composite material integrates advantages of the covalent carbon grid structure composed of the silicon nanomaterial, carbon converted by part of the binder and the carbon nanomaterial, mechanical performance and electron transmission stability of the composite material are improved, and the composite material presents extremely excellent charging-discharging specific capacity and circulating stability when serving as a lithium ion battery electrode and has good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of battery electrode materials, and relates to a carbon-silicon composite material and its preparation method and application, in particular to a covalent carbon network-based carbon-silicon composite material and its preparation method and application. Background technique [0002] Silicon can be used as a negative electrode active material for lithium-ion batteries instead of graphite, which has higher specific capacity. However, silicon materials undergo huge volume changes during charging and discharging, and the resulting mechanical stress leads to pulverization of active materials, structural collapse, repeated interface construction, and detachment between materials and current collectors, resulting in rapid capacity fading and reduced battery cycle performance. [0003] Nanostructuring silicon materials and then combining them with carbon nanomaterials to construct carbon-silicon nanocomposites can effectively...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/04H01M10/0525
CPCH01M4/0471H01M4/362H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 李祥龙张兴豪智林杰
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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