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A kind of preparation method of graphene nanoribbon winding germanium nanoparticle composite material

A graphene nanoribbon, composite material technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as expensive raw materials, pollution and energy consumption, and achieve good conductivity and low cost. , the effect of the simple method

Active Publication Date: 2020-12-08
重庆锦添翼新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of the tightness of the existing germanium-graphene combination, and overcome the problems of expensive raw materials, pollution and large energy consumption in the production process of the existing germanium-graphene nanoribbon composite material

Method used

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  • A kind of preparation method of graphene nanoribbon winding germanium nanoparticle composite material
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  • A kind of preparation method of graphene nanoribbon winding germanium nanoparticle composite material

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Embodiment 1

[0020] The concrete steps of a kind of preparation method of graphene nanoribbon winding germanium nanoparticle composite material are as follows:

[0021] 1) According to the quality of germanium dioxide: the ratio of the volume of sodium hydroxide solution is 1g: 50mL, the two are ultrasonically treated for 1 hour to obtain the metagermanate solution, and the concentration of the sodium hydroxide solution is 0.2 mol / L;

[0022] 2) According to the ratio of the volume of metagermanate solution: the mass of graphene nanobelts: the mass of polyvinylpyrrolidone is 1mL: 2g.: 1g, the three are mixed and stirred for 18h, and the mixed solution of the three is obtained A: Add an appropriate amount of acid solution dropwise to the mixed solution A, mix and stir until the pH is 7.8, and then obtain the mixed solution B, and the acid solution is a hydrochloric acid or nitric acid solution with a concentration of 0.15mol / L;

[0023] 3) According to the volume of the sodium borohydride ...

Embodiment 2

[0027] The concrete steps of a kind of preparation method of graphene nanoribbon winding germanium nanoparticle composite material are as follows:

[0028] 1) According to the quality of germanium dioxide: the ratio of the volume of sodium hydroxide solution is 1g: 70mL, the two are ultrasonically treated for 1 hour to obtain the metagermanate solution, and the concentration of the sodium hydroxide solution is 0.5 mol / L;

[0029] 2) According to the ratio of the volume of metagermanate solution: the mass of graphene nanobelts: the mass of polyvinylpyrrolidone is 1mL: 2g: 2g, the three are mixed and stirred for 24h, and the mixed solution A of the three is obtained ; Add an appropriate amount of acid solution dropwise to the mixed solution, mix and stir until pH=7.4, and then obtain the mixed solution B, and the acid solution is a hydrochloric acid or nitric acid solution with a concentration of 0.5 mol / L;

[0030] 3) According to the volume of the sodium borohydride solution:...

Embodiment 3

[0034] The concrete steps of a kind of preparation method of graphene nanoribbon winding germanium nanoparticle composite material are as follows:

[0035] 1) According to the quality of germanium dioxide: the volume ratio of the sodium hydroxide solution is 1g: 80mL, the two are ultrasonically treated for 2 hours to obtain the metagermanate solution, and the concentration of the sodium hydroxide solution is 0.7 mol / L;

[0036] 2) According to the ratio of the volume of metagermanate solution: the mass of graphene nanobelts: the mass of polyvinylpyrrolidone is 1mL: 4g: 6g, the three are mixed and stirred for 36h to obtain the mixed solution A of the three ; Add an appropriate amount of acid solution dropwise to the mixed solution, mix and stir until pH = 7.6, to obtain the mixed solution B, and the acid solution is a hydrochloric acid or nitric acid solution with a concentration of 1mol / L;

[0037] 3) According to the volume of the sodium borohydride solution: the ratio of th...

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Abstract

The present invention belongs to the technical field of lithium-ion batteries, and particularly relates to a lithium-ion battery negative electrode material preparation method, ie., a graphene nano-belt wound nanometer germanium composite material preparation method, wherein graphene nano-belts and germanium dioxide powder are adopted as raw materials, and the germanium-graphene nano-belt composite material product is subjected to in situ synthesis by using a one-step method. According to the present invention, the operation is simple, the cost is low, the environmentally friendly property is provided, and the prepared product has characteristics of excellent structure stability, excellent electrical conductivity, and effective inhibition of the volume effect of germanium during the charging and discharging process, can be widely used in high-current and high-power equipment, and is especially adopted as the lithium-ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a lithium ion battery negative electrode material. Background technique [0002] Germanium is a group IVA alloyed negative electrode material, and its theoretical specific capacity is 1600mAh / g. At room temperature, the conductivity of germanium is about 104 times that of silicon. The diffusion rate of lithium ions in germanium is 400 times faster than that in silicon, which is especially suitable for high-power lithium-ion batteries. However, germanium undergoes a volume change of up to 370% during charge-discharge cycles, which leads to crushing of the electrodes, collapse of the conductive network, and loss of capacity. Therefore, the use of graphene nanoribbons to coat and entangle germanium nanoparticles can effectively alleviate the volume effect of germanium during cycling. At the same time, graphene nanobelts can form el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/587H01M10/0525Y02E60/10
Inventor 李新禄张欣琳李同涛赵昱颉黄佳木
Owner 重庆锦添翼新能源科技有限公司