Lithium battery negative electrode composite material based on nanometer silicon carbide and preparation method thereof

A technology of composite materials and lithium batteries, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as low specific capacity and poor retention capacity, and achieve low cost and good application prospects , The effect of excellent first discharge specific capacity performance

Active Publication Date: 2017-07-11
博高运力科技(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the second solution is a good solution to the above problems, the existing nano-silicon-carbon composites generally have the defects of low initial discharge specific capacity and poor retention capacity after multiple cycles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A lithium battery negative electrode composite material based on nano-silicon carbon, made of the following raw materials in parts by weight: 40 parts of nano-silicon powder, 3 parts of lithium hydride, 32 parts of graphene, 6 parts of melamine, 1 part of polyvinylpyrrolidone, and phthalate 2 parts of copper cyanine; wherein, the particle size of the nano silicon powder is 10-50nm, the particle size of the graphene is 50-100nm, and the particle size of the lithium hydride is 5-30nm.

[0028] In this embodiment, the preparation method of the lithium battery negative electrode composite material based on nano-silicon carbon, the steps are as follows:

[0029] 1) Weighing nano-silica powder, lithium hydride and graphene, ball milling and mixing for 12 hours, and drying to obtain the first mixture;

[0030] 2) Add 12 times the weight of methanol to the first mixture, then add half of the total amount of melamine, and after ultrasonic treatment for 1 hour, obtain the second ...

Embodiment 2

[0037] A lithium battery negative electrode composite material based on nano-silicon carbon, made of the following raw materials in parts by weight: 41 parts of nano-silicon powder, 4 parts of lithium hydride, 33 parts of graphene, 9 parts of melamine, 1.7 parts of polyvinylpyrrolidone, phthalate 4 parts of copper cyanine; wherein, the particle size of the nano silicon powder is 10-50nm, the particle size of the graphene is 50-100nm, and the particle size of the lithium hydride is 5-30nm.

[0038] In this embodiment, the preparation method of the lithium battery negative electrode composite material based on nano-silicon carbon, the steps are as follows:

[0039] 1) Weighing nano silicon powder, lithium hydride and graphene, ball milling and mixing for 13 hours, drying to obtain the first mixture;

[0040] 2) Add 12 times the weight of methanol to the first mixture, then add half of the total amount of melamine, and after ultrasonic treatment for 1.5 hours, obtain the second m...

Embodiment 3

[0047] A lithium battery negative electrode composite material based on nano-silicon carbon, made of the following raw materials in parts by weight: 43 parts of nano-silicon powder, 5 parts of lithium hydride, 34 parts of graphene, 8 parts of melamine, 1.5 parts of polyvinylpyrrolidone, phthalate 3 parts of copper cyanine; wherein, the particle size of the nano silicon powder is 10-50nm, the particle size of the graphene is 50-100nm, and the particle size of the lithium hydride is 5-30nm.

[0048] In this embodiment, the preparation method of the lithium battery negative electrode composite material based on nano-silicon carbon, the steps are as follows:

[0049] 1) Weighing nano silicon powder, lithium hydride and graphene, ball milling and mixing for 14 hours, drying to obtain the first mixture;

[0050] 2) Add 13 times the weight of methanol to the first mixture, then add half of the total amount of melamine, and after ultrasonic treatment for 1.5 hours, obtain the second m...

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Abstract

The invention discloses a lithium battery negative electrode composite material based on nanometer silicon carbide. The lithium battery negative electrode composite material is prepared from 40 to 45 parts by weight of nanometer silicon powder, 3 to 7 parts by weight of lithium hydride, 32 to 36 parts by weight of graphene, 6 to 10 parts by weight of melamine, 1 to 2 parts by weight of polyvinylpyrrolidone and 2 to 5 parts of copper phthalocyanine. The invention also discloses a preparation method of the lithium battery negative electrode composite material based on nanometer silicon carbide. The lithium battery negative electrode composite material has an excellent first discharge specific capacity, still maintains a high retention capacity and excellent cycle stability after many cycles, is prepared through simple processes, realizes a low cost, realizes large scale production and has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of lithium battery negative electrode materials, in particular to a lithium battery negative electrode composite material based on nano-silicon carbon and a preparation method thereof. Background technique [0002] China has become the world's largest automobile sales market, and the continuous increase in oil consumption and pollutant emissions has become a bottleneck for the sustainable development of the automobile industry. The development of hybrid vehicles, pure electric vehicles, fuel cell vehicles and other energy-saving and new energy vehicles has become a top priority. At present, energy-saving and new energy vehicles have not been widely promoted, mainly due to a series of problems in power batteries, such as low energy density, large weight and volume, short service life, high cost, narrow operating temperature range, and charging time long wait. In order to improve these adverse effects, peopl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M4/60H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/386H01M4/583H01M4/60H01M4/625H01M10/0525Y02E60/10
Inventor 李宝玉陈枫王慧娟李良学
Owner 博高运力科技(深圳)有限公司
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