Composite material with silicon monoxide coated with nitrogen doping carbon material and preparation method thereof

A silicon oxide, nitrogen carbon material technology, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve problems such as hindering graphene application, completely controlled, and incapable of electrical conductivity, and achieve buffer volume changes, increase Surface polarity, the effect of improving electronic conductivity

Active Publication Date: 2017-11-28
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because graphene has no energy band gap, its electrical conductivity cannot be completely controlled like traditional semiconductors,

Method used

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  • Composite material with silicon monoxide coated with nitrogen doping carbon material and preparation method thereof
  • Composite material with silicon monoxide coated with nitrogen doping carbon material and preparation method thereof
  • Composite material with silicon monoxide coated with nitrogen doping carbon material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A composite material of silicon oxide coated with nitrogen-doped carbon material, with silicon oxide as the core, and silicon oxide coated with nitrogen-doped carbon material to form a core-shell structure, wherein the nitrogen-doped carbon material is nitrogen-doped graphene and A mixture of nitrogen oxide pitch; in the composite material of silicon oxide coated with nitrogen-doped carbon material, it includes: 70% silicon oxide, 20% nitrogen-doped graphene, and 10% nitrogen-doped pitch oxide;

[0042] Among them, in the composite material of silicon oxide coated with nitrogen-doped carbon material, the amount of nitrogen doping is 7wt%, and the particle size D50 of silicon oxide is 4.20 μm;

[0043] The composite material of silicon oxide coated with nitrogen-doped carbon material is prepared by the following steps:

[0044]S1. Preparation of graphene oxide: put flake graphite with a particle size of 50-400 μm into a ceramic ball mill jar, add water to disperse, add c...

Embodiment 2

[0050] A composite material of silicon oxide coated with nitrogen-doped carbon material, with silicon oxide as the core, and silicon oxide coated with nitrogen-doped carbon material to form a core-shell structure, wherein the nitrogen-doped carbon material is nitrogen-doped graphene and A mixture of nitrogen oxide pitch; in the composite material of silicon oxide coated with nitrogen-doped carbon material, it includes by weight percentage: 80% silicon oxide, 10% nitrogen-doped graphene, and 10% nitrogen-doped pitch oxide;

[0051] Among them, in the composite material of silicon oxide coated with nitrogen-doped carbon material, the nitrogen doping amount is 12wt%, and the particle size D50 of silicon oxide is 6.50 μm;

[0052] The composite material of silicon oxide coated with nitrogen-doped carbon material is prepared by the following steps:

[0053] S1. Preparation of graphene oxide: put flake graphite with a particle size of 50-300 μm into a ceramic ball mill jar, add wate...

Embodiment 3

[0058] A composite material of silicon oxide coated with nitrogen-doped carbon material, with silicon oxide as the core, and silicon oxide coated with nitrogen-doped carbon material to form a core-shell structure, wherein the nitrogen-doped carbon material is nitrogen-doped graphene and A mixture of nitrogen oxide pitch; in the composite material of silicon oxide coated with nitrogen-doped carbon material, it includes: 85% silicon oxide, 10% nitrogen-doped graphene, and 5% nitrogen-doped pitch oxide;

[0059] Among them, in the composite material of silicon oxide coated with nitrogen-doped carbon material, the nitrogen doping amount is 12wt%, and the particle size D50 of silicon oxide is 8.50 μm;

[0060] The composite material of silicon oxide coated with nitrogen-doped carbon material is prepared by the following steps:

[0061] S1. Preparation of graphene oxide: put expanded graphite with a particle size of 50-300 μm into a ceramic ball mill jar, add water to disperse, add ...

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Abstract

The invention discloses a composite material with silicon monoxide coated with a nitrogen doping carbon material. The silicon monoxide is used as a core; the nitrogen doping carbon material is used for coating the silicon monoxide to form a shell-core structure, wherein the nitrogen doping carbon material is a mixture of nitrogen doping graphene and nitrogen doping oxidized asphalt. The composite material with the silicon monoxide coated with the nitrogen doping carbon material is prepared from the following ingredients in percentage by weight: 70 to 90 percent of silicon monoxide, 5 to 20 percent of nitrogen doping graphene and 3 to 15 percent of nitrogen doping oxidized asphalt. The invention also discloses a preparation method of the composite material with silicon monoxide coated with the nitrogen doping carbon material. The silicon monoxide is used as the core; the nitrogen doping carbon material is used for coating the silicon monoxide to form the shell-core structure; the electron conductivity of a negative electrode material is improved; meanwhile, the volume change of the negative electrode material in the lithium embedding removal process can be buffered; the structure stability of the material in the circulation process is improved; the advantages of high reversible volume and good circulation performance are realized.

Description

technical field [0001] The invention relates to the technical field of silicon oxide composite negative electrode materials, in particular to a composite material of silicon oxide coated with a nitrogen-doped carbon material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have attracted much attention due to their high specific energy and long cycle life, and have been widely used in portable electronic devices, computers and other fields. Lithium-ion batteries are mainly composed of four parts: positive electrode materials, negative electrode materials, separators and electrolytes. Among them, commercial lithium-ion battery negative electrode materials are mainly graphite-based negative electrode materials, but their theoretical capacity is only 372mAh / g, which cannot meet people's expectations. The demand for high energy density batteries. Therefore, the development of anode materials with high specific capacity, high charge-discharge...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 齐美洲杨茂萍杨尘王辉
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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