A kind of preparation method of high-energy graphene battery negative electrode material

A battery negative electrode and graphene technology, applied in the direction of graphene, battery electrodes, negative electrodes, etc., can solve the problems of long ion propagation path and large thickness, and achieve the effect of increasing diffusion speed and enhancing binding force

Active Publication Date: 2019-07-23
梧州市同创新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a preparation method of a high-energy graphene battery negative electrode material, which is used to solve the problems of large thickness of graphene-wrapped silicon-based materials and long ion propagation paths

Method used

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Examples

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Embodiment 1

[0023] A preparation method of a high-energy graphene battery negative electrode material, comprising the following steps:

[0024] S1. In parts by weight, take 4 parts of natural flake graphite, 25 parts of concentrated sulfuric acid, 6 parts of concentrated phosphoric acid, 2 parts of concentrated nitric acid, 1 part of lithium chloride, and 10 parts of potassium perchlorate to react at 65 °C for 1 hour. Lower the temperature below 30°C, then add 120 parts of concentrated sulfuric acid and control the temperature below 40°C, then continue to add 26 parts of potassium permanganate, add 16 parts of hydrogen peroxide with a mass fraction of 27% dropwise, and use a water bath to control the temperature. Keep stirring at 30°C for 12 hours, filter after the reaction, and alternately wash the filtered solid with deionized water and ethanol until neutral to obtain graphene oxide;

[0025] S2. In parts by weight, take 1 part of graphene oxide and add 500 parts of deionized water, the...

Embodiment 2

[0029] A preparation method of a high-energy graphene battery negative electrode material, comprising the following steps:

[0030] S1. In parts by weight, take 4 parts of expanded graphite, 25 parts of concentrated sulfuric acid, 6 parts of concentrated phosphoric acid, 2 parts of concentrated nitric acid, 1 part of ferric chloride, 0.5 part of calcium chloride, and 9.5 parts of potassium perchlorate to react at 70 °C for 1.2 h, after the reaction is finished, the temperature is lowered to below 30°C, then 120 parts of concentrated sulfuric acid is added and the temperature is controlled below 40°C, and then 25 parts of potassium permanganate is added, and 15 parts of hydrogen peroxide with a mass fraction of 35% are added dropwise. Use a water bath to control the temperature and keep stirring at 25°C for 10 hours, filter after the reaction, and alternately wash the filtered solid with deionized water and ethanol until neutral to obtain graphene oxide;

[0031] S2. In terms o...

Embodiment 3

[0035] A preparation method of a high-energy graphene battery negative electrode material, comprising the following steps:

[0036]S1. In parts by weight, get 4 parts of natural flake graphite, 25 parts of concentrated sulfuric acid, 6 parts of concentrated phosphoric acid, 2 parts of concentrated nitric acid, 0.5 part of lithium chloride, 0.5 part of calcium carbonate, 0.5 part of potassium acetate, 9 parts of potassium perchlorate React at 75°C for 2 hours. After the reaction, lower the temperature to below 30°C, then add 120 parts of concentrated sulfuric acid and control the temperature below 40°C, then continue to add 28 parts of potassium permanganate, and add 18 parts of mass fraction dropwise. 32% hydrogen peroxide, use a water bath to control the temperature and keep stirring at 28°C for 11 hours, filter after the reaction, and alternately wash the filtered solid with deionized water and ethanol until neutral to obtain graphene oxide;

[0037] S2. In parts by weight, ...

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Abstract

The invention discloses a preparation method of a high-energy graphene negative electrode material. The method comprises the following steps: oxidizing, intercalating and peeling natural flake graphite or expanded graphite to form monolayer graphene oxide; and ball-milling silicon monoxide in a ball mill at a temperature of 60 DEG C or below, purifying and etching the ball-milled silicon monoxide with hydrofluoric acid after the ball milling is finished, wrapping the purified and etched silicon monoxide with the monolayer graphene oxide, carrying out low-temperature calcining stabilization, and finally reducing the monolayer graphene oxide with hydrazine hydrate to obtain the negative electrode material. The problems of large thickness and long ion propagation path of a graphene-wrapped silicon-based material are solved in the invention.

Description

technical field [0001] The invention belongs to the field of high-energy graphene batteries, and in particular relates to a preparation method of a high-energy graphene battery negative electrode material. Background technique [0002] Graphene is a planar film composed of carbon atoms in a hexagonal honeycomb lattice with sp2 hybrid orbitals. It is a two-dimensional material with a thickness of only one carbon atom. Its electron mobility at room temperature exceeds 15,000 cm 2 / V·s, which is higher than that of carbon nanotubes or silicon crystals, and the resistivity is only about 10 -8 Ω·m, lower than copper or silver, is currently the material with the smallest resistivity. Pure graphene materials cannot replace the current commercial battery anode materials due to their low first-cycle Coulombic efficiency, high charge-discharge platform, and poor cycle performance stability. [0003] Silicon-based anode materials have a high theoretical capacity (capable of forming L...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/587C01B32/19C01B33/113H01M10/0525
CPCC01B33/113C01P2004/80C01P2006/40H01M4/366H01M4/48H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 不公告发明人
Owner 梧州市同创新能源材料有限公司
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