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Preparation method of high-energy graphene battery negative electrode material

A battery anode, graphene technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of poor cycle performance, low first coulomb efficiency, etc., and achieve good cycle performance, high first coulomb efficiency, fast intercalation and The effect of de-embedding

Active Publication Date: 2019-12-03
南通鼎鑫电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a high-energy graphene battery negative electrode material, so as to solve the technical problems of the existing graphene materials such as low first-time coulombic efficiency and poor cycle performance.

Method used

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Embodiment 1

[0026] A preparation method of a high-energy graphene battery negative electrode material is to add Si-B-Co co-doped graphene oxide and carbon fiber-quartz fiber composite fiber into the aqueous solution of p-toluenesulfonic acid according to the mass ratio of 1:0.1, heat, and quickly add Ethyl orthosilicate, slowly drip toluene while stirring (utilize 10 minutes to drop at a constant speed), obtain gel body, aging, reduction, freeze-drying, promptly obtains described a kind of high-energy graphene battery negative electrode material; The Si-B-Co co-doped graphene oxide is to add nano-silicon powder, boric acid, and cobalt nitrate hexahydrate into the graphene oxide dispersion, and heat at 500°C for 10 hours under an inert atmosphere (argon) and ultrasonic vibration conditions. Post-treatment, wherein, the molar ratio of nano silicon powder, boric acid, cobalt nitrate hexahydrate and graphene oxide dispersion liquid contained in graphene oxide is 0.03:0.06:0.02:1; the carbon fi...

Embodiment 2

[0035] A preparation method of a high-energy graphene battery negative electrode material is to add Si-B-Co co-doped graphene oxide and carbon fiber-quartz fiber composite fiber into p-toluenesulfonic acid aqueous solution according to the mass ratio of 1:0.2, heat, and quickly add Ethyl orthosilicate, slowly drip toluene while stirring (utilize 12 minutes to drop at a constant speed), obtain gel, aging, reduction, freeze-drying, promptly obtains described a kind of high-energy graphene battery negative electrode material; The Si-B-Co co-doped graphene oxide is to add nano-silicon powder, boric acid, and cobalt nitrate hexahydrate into the graphene oxide dispersion, and heat at 600°C for 12 hours under an inert atmosphere (helium) and ultrasonic vibration conditions. Post-treatment, wherein, the molar ratio of nano silicon powder, boric acid, cobalt nitrate hexahydrate and graphene oxide dispersion liquid contained in graphene oxide is 0.04:0.07:0.03:1; the carbon fiber-quartz ...

Embodiment 3

[0044] A preparation method of a high-energy graphene battery negative electrode material is to add Si-B-Co co-doped graphene oxide and carbon fiber-quartz fiber composite fiber into the aqueous solution of p-toluenesulfonic acid according to the mass ratio of 1:0.1, heat, and quickly add Ethyl orthosilicate, slowly drip toluene while stirring (utilize 12 minutes to drop at a constant speed), obtain gel, aging, reduction, freeze-drying, promptly obtains described a kind of high-energy graphene battery negative electrode material; The Si-B-Co co-doped graphene oxide is to add nano-silicon powder, boric acid, and cobalt nitrate hexahydrate into the graphene oxide dispersion, and heat at 500°C for 12 hours under an inert atmosphere (argon) and ultrasonic vibration conditions. Post-treatment, wherein, the molar ratio of nano silicon powder, boric acid, cobalt nitrate hexahydrate and graphene oxide dispersion liquid contained in graphene oxide is 0.03:0.07:0.02:1; the carbon fiber-q...

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Abstract

The invention provides a preparation method of a high-energy graphene battery negative electrode material. The method comprises the steps that Si-B-Co co-doped graphene oxide, carbon fiber-quartz fiber composite fiber are added at a mass ratio of 1: 0.1 to 0.2 in to a toluene sulfonic acid aqueous solution and heated; ethyl orthosilicate is quickly added, and toluene is slowly added dropwise whilestirring is carried out to acquire gel; and ageing, reduction and freeze drying are carried out to acquire the high-energy graphene battery negative electrode material. According to the invention, Si-B-Co co-doped graphene oxide, carbon fiber-quartz fiber composite fiber are used as raw materials to perform gelation treatment to generate a rich-pore structure and provide more lithium storage sites; graphene-doped micro individuals in the acquired negative electrode material form a bridge network structure through composite fiber, providing more diffusion channels for lithium ions and achieving rapid insertion and deintercalation of lithium ions; the diffusion rate of lithium ions in the negative electrode material is enhanced; and the acquired negative electrode material has higher firstCoulomb efficiency and good cycle performance.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a method for preparing a high-energy graphene battery negative electrode material. Background technique [0002] With economic development and social progress, the demand for energy is increasing, and the stock of mineral energy such as coal, oil, and natural gas has declined sharply, which can no longer meet the development of human society. Moreover, fossil energy is a non-renewable energy, and the increasing depletion of fossil energy is It is irreversible and an unavoidable challenge for future development. At the same time, fossil energy is also a major culprit of environmental pollution. Therefore, how to improve energy efficiency and develop and utilize renewable energy has become a common goal of governments and scientific researchers. At present, there are many researches on replacing traditional fossil energy with chemical power sources, which can effectively...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/362H01M4/587H01M4/62H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 不公告发明人
Owner 南通鼎鑫电池有限公司
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