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Preparation method of germanium nano-particle/multi-layer graphite compound-based high-performance anode material for lithium-ion battery

A lithium-ion battery and nanoparticle technology, applied in the field of electrochemistry, can solve the problems of using organic solvent system, application limitation of nanogermanium, toxicity of precursors, etc., and achieves improved electric capacity, good biocompatibility, good electrochemical performance, etc. performance effect

Active Publication Date: 2016-04-27
QUANZHOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These synthesis methods have their own limitations, such as the toxicity of some raw material precursors, or the synthesis temperature is too high, or the need to use organic solvent systems, etc., resulting in great restrictions on the application of nano-germanium in the field of actual production

Method used

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  • Preparation method of germanium nano-particle/multi-layer graphite compound-based high-performance anode material for lithium-ion battery
  • Preparation method of germanium nano-particle/multi-layer graphite compound-based high-performance anode material for lithium-ion battery
  • Preparation method of germanium nano-particle/multi-layer graphite compound-based high-performance anode material for lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation of multilayer graphite oxide:

[0033] ①Expand expanded graphite powder at 900°C for 30s at high temperature to obtain flocculent expanded graphite;

[0034] 2. Get the flocculent expanded graphite 1g of the heat-treated step 1., mix with 6gKMnO 4 , 1gNaNO 3 Mix, and slowly add 60ml of concentrated sulfuric acid while stirring evenly, and continue stirring for 24h to obtain a reaction solution;

[0035] ③Add the reaction solution of step ② into 300ml deionized water, the mixed solution generates a lot of heat and bubbles, keep stirring until the temperature of the mixed solution is cooled, then add 15ml of 30wt% hydrogen peroxide to obtain a bright yellow graphite oxide solution;

[0036] 4. Filtrate the graphite oxide solution of step 3. while hot to obtain multilayer graphite oxide, wash the multilayer graphite oxide 1-2 times with 5% hydrochloric acid solution, then wash the multilayer graphite oxide 1-2 times with deionized water, and wash the mult...

Embodiment 2

[0049] (1) Preparation of multilayer graphite oxide:

[0050] ①Expand expanded graphite powder at 900°C for 30s at high temperature to obtain flocculent expanded graphite;

[0051] 2. Get the flocculent expanded graphite 1g of the heat-treated step 1., mix with 6gKMnO 4 , 1gNaNO 3 Mix, slowly add 60ml of concentrated sulfuric acid while stirring evenly, and continue stirring for 20h to obtain a reaction solution;

[0052] ③Add the reaction solution of step ② into 300ml deionized water, the mixed solution generates a lot of heat and bubbles, keep stirring until the temperature of the mixed solution is cooled, then add 15ml of 30wt% hydrogen peroxide to obtain a bright yellow graphite oxide solution;

[0053] 4. Filtrate the graphite oxide solution of step 3. while hot to obtain multilayer graphite oxide, wash the multilayer graphite oxide 1-2 times with 5% hydrochloric acid solution, then wash the multilayer graphite oxide 1-2 times with deionized water, and wash the multilay...

Embodiment 3

[0063] (1) Preparation of multilayer graphite oxide:

[0064] ①Expand expanded graphite powder at 900°C for 30s at high temperature to obtain flocculent expanded graphite;

[0065] 2. Get the flocculent expanded graphite 1g of the heat-treated step 1., mix with 6gKMnO 4 , 1gNaNO 3 Mix, and slowly add 60ml of concentrated sulfuric acid while stirring evenly, and continue stirring for 30h to obtain a reaction solution;

[0066] ③Add the reaction solution of step ② into 300ml deionized water, the mixed solution generates a lot of heat and bubbles, keep stirring until the temperature of the mixed solution is cooled, then add 15ml of 30wt% hydrogen peroxide to obtain a bright yellow graphite oxide solution;

[0067] 4. Filtrate the graphite oxide solution of step 3. while hot to obtain multilayer graphite oxide, wash the multilayer graphite oxide 1-2 times with 5% hydrochloric acid solution, then wash the multilayer graphite oxide 1-2 times with deionized water, and wash the mult...

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Abstract

The invention provides a preparation method of a germanium nano-particle / multi-layer graphite compound-based high-performance anode material for a lithium-ion battery. By a common water solution method, germanium nano-particles are formed by reducing germanium dioxide, and are compounded with a multi-layer graphite material to prepare a nontoxic nano germanium / multi-layer graphite composite material, so that the nontoxic nano germanium / multi-layer graphite composite material is applied to the anode material for the lithium-ion battery and demonstrates excellent electrochemical properties. According to the preparation method provided by the invention, a high-quality germanium nano-particle / multi-layer graphite compound is obtained for the first time. Compared with other physical or chemical methods, the experimental operation is simpler and more convenient; a fussy chemical preparation process is not needed; meanwhile, the prepared composite material is high in purity and free of an oxidation layer; and the electric capacity of the lithium-ion battery can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a high-quality germanium nanoparticle / multilayer graphite composite grown by a simple and feasible hydrothermal method, and realizes the preparation of a negative electrode material of a high-performance lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used in mobile electronic communication equipment. With the increasing consumption of fossil energy and the advancement of lithium-ion battery technology and its price decline, lithium-ion batteries have a good role in the field of power energy, especially in new electric vehicles. Application prospects and development momentum. Traditional gasoline / natural gas vehicles are changing to hybrid and pure electric vehicles. Some countries have proposed plans to develop power systems for electric vehicles. The prospects for energy-saving and environmentally friendly electric vehicles are w...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/587H01M10/0525Y02E60/10
Inventor 吴启辉
Owner QUANZHOU NORMAL UNIV
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