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Nano-silicon-carbon composite material for negative electrode of lithium battery and preparation method thereof

A technology of carbon composite materials and nano-silicon, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems that affect the performance of nano-silicon-carbon composite materials, are prone to agglomeration, and are not easy to disperse. Achieve important market value and social value, good cycle performance, charge and discharge performance, and guaranteed performance

Active Publication Date: 2020-02-11
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

However, the existing nano-silicon-carbon composites are prone to agglomeration during the preparation process and are not easy to disperse, which affects the performance of nano-silicon-carbon composites

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A nano-silicon-carbon composite material for a lithium battery negative electrode, made of the following raw materials in parts by weight: 52 parts of nano-silicon powder, 125 parts of anilinomethyltriethoxysilane, 80 parts of graphite, 2500 parts of ethylenediamine, 400 parts of 4-dimethylaminopyridine, 230 parts of dimethyl sulfoxide, 28 parts of nano-sodium chloride powder, and 34 parts of nickel phthalocyanine.

[0030] In this embodiment, the preparation method of the nano-silicon-carbon composite material for the lithium battery negative electrode, the steps are as follows:

[0031] 1) Weigh nano-silica powder, put it into an open container, and heat it at 150°C for 20 minutes to obtain the first product;

[0032] 2) Weigh anilinomethyltriethoxysilane, combine the first product with anilinomethyltriethoxysilane, add 5 times the weight of toluene, ultrasonically treat for 30min, then heat and reflux at 120°C for 1h , filtered, washed with water, dried to obtain th...

Embodiment 2

[0042] A nano-silicon-carbon composite material for a lithium battery negative electrode, made of the following raw materials in parts by weight: 53 parts of nano-silicon powder, 126 parts of anilinomethyltriethoxysilane, 81 parts of graphite, 2900 parts of ethylenediamine, 440 parts of 4-dimethylaminopyridine, 260 parts of dimethyl sulfoxide, 29 parts of nano-sodium chloride powder, and 36 parts of nickel phthalocyanine.

[0043] In this embodiment, the preparation method of the nano-silicon-carbon composite material for the lithium battery negative electrode, the steps are as follows:

[0044] 1) Weighing nano-silica powder, putting it into an open container, and heating at 155°C for 23 minutes to obtain the first product;

[0045] 2) Weigh anilinomethyltriethoxysilane, combine the first product with anilinomethyltriethoxysilane, add 6 times the weight of toluene, ultrasonically treat for 35min, then heat and reflux at 123°C for 1h , filtered, washed with water, dried to obta...

Embodiment 3

[0055] A nano-silicon-carbon composite material for a lithium battery negative electrode, made of the following raw materials in parts by weight: 55 parts of nano-silicon powder, 127 parts of anilinomethyltriethoxysilane, 82 parts of graphite, 2800 parts of ethylenediamine, 420 parts of 4-dimethylaminopyridine, 250 parts of dimethyl sulfoxide, 30 parts of nano-sodium chloride powder, and 35 parts of nickel phthalocyanine.

[0056] In this embodiment, the preparation method of the nano-silicon-carbon composite material for the lithium battery negative electrode, the steps are as follows:

[0057] 1) Weighing nano-silica powder, putting it into an open container, and heating at 160°C for 25 minutes to obtain the first product;

[0058] 2) Weigh anilinomethyltriethoxysilane, combine the first product with anilinomethyltriethoxysilane, add 7 times the weight of toluene, and after ultrasonic treatment for 40min, heat and reflux at 125°C for 1.5 h, filtered, washed with water, drie...

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Abstract

The invention discloses a nano silicon-carbon composite material for the negative electrode of a lithium battery. The composite material is prepared from the following raw materials in parts by weight: 52 to 58 parts of nano silicon powder, 125 to 130 parts of phenylaminomethyltriethoxysilane, 80 to 85 parts of graphite, 2500 to 3000 parts of ethylene diamine, 400 to 450 parts of 4-dimethylamino pyridine, 230 to 270 parts of dimethyl sulfoxide, 28 to 32 parts of nano sodium chloride powder, and 34 to 37 parts of nickel phthalocyanine. The provided composite material has a good circulation performance and charge-discharge performance and an important market value and social value, and will not become agglomerated during the preparation process, nano silicon is fully dispersed, and the properties of the material are guaranteed.

Description

technical field [0001] The invention relates to the technical field of lithium battery negative electrode materials, in particular to a nano-silicon-carbon composite material for lithium battery negative electrodes 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, people ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/386H01M4/587H01M4/625H01M10/0525Y02E60/10
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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