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Preparation method of graphene-dopedand carbon-coated modified graphite anode material

A graphite anode and graphene technology, which is applied to battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor graphite high-rate charge and discharge performance, poor compatibility with electrolyte organic solvents, etc. The effect of increasing the diffusion coefficient of lithium ions and suppressing aggregation

Inactive Publication Date: 2015-09-23
田东
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a preparation method of graphene-doped and carbon-coated modified graphite negative electrode material, aiming to solve the problems of poor high-rate charge-discharge performance of graphite and poor compatibility with organic solvents of electrolytes, etc. Improve battery charge and discharge cycle performance

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  • Preparation method of graphene-dopedand carbon-coated modified graphite anode material

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Embodiment 1

[0019] A preparation method of graphene-doped and coated graphite composite negative electrode material, comprising the following steps:

[0020] (1) Prepare a 5mg / mL graphene oxide aqueous solution, pour 40mL of a 5mg / mL graphene oxide aqueous solution into a 50mL stainless steel reactor with polytetrafluoroethylene as the liner, seal the stainless steel reactor and place it in a blast drying oven , reacted at 180°C for 20 hours, then naturally cooled the stainless steel reactor to room temperature, absorbed the water in the solution with filter paper to dryness, and placed the obtained powder in a vacuum drying oven to fully dry to obtain a graphene material. The specific surface of graphene material is at 2000m 2 / g;

[0021] (2) Under stirring conditions, press graphene: natural graphite (D50: 10.82μm, specific surface area: 6.1m 2 / g, tap density: 0.96g / cm 3 ) with a mass ratio of 0.05:1, mix the graphite evenly in the graphene solution, and add the carbon precursor-po...

Embodiment 2

[0025] A preparation method of graphene-doped and coated graphite composite negative electrode material, comprising the following steps:

[0026] (1) Prepare 2 mg / mL graphene oxide aqueous solution, pour 40 mL 2 mg / mL graphene oxide aqueous solution into a 50 mL stainless steel reaction kettle with polytetrafluoroethylene as the liner, seal it and place it in a blast drying oven React at 120°C for 12 hours, then naturally cool the reaction vessel to room temperature, absorb the water in the solution with filter paper to dryness, and place the obtained powder in a vacuum drying oven to fully dry to obtain a graphene material. The specific surface of graphene material is at 2300 m 2 / g;

[0027] (2) Under stirring conditions, according to graphene: artificial graphite (D50: 17.21μm, specific surface area: 5.8m 2 / g, tap density: 0.85g / cm 3 ) with a mass ratio of 0.1:1, mix the graphite evenly in the graphene solution, and add the carbon precursor-phenolic resin at a ratio of...

Embodiment 3

[0031] A preparation method of graphene-doped and coated graphite composite negative electrode material, comprising the following steps:

[0032] (1) Prepare 8 mg / mL graphene oxide aqueous solution, pour 40 mL 8 mg / mL graphene oxide aqueous solution into a 50 mL stainless steel reaction kettle with polytetrafluoroethylene as the liner, seal and place in a blast drying oven React at 150°C for 16 hours, then naturally cool the reaction vessel to room temperature, absorb the water in the solution with filter paper to dryness, and place the obtained powder in a vacuum drying oven to fully dry to obtain a graphene material. The specific surface of graphene material is at 1850 m 2 / g;

[0033] (2) Under stirring conditions, according to graphene: natural graphite (D50: 8.14μm, specific surface area: 6.9m 2 / g, tap density: 1.04g / cm 3) with a mass ratio of 0.08:1, mix the graphite evenly in the graphene solution, and add the carbon precursor-polyvinyl alcohol at a ratio of 7% by ...

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Abstract

The invention discloses a preparation method of graphene-doped and carbon-coated modified graphite anode material. The doping and modification of the graphene to graphite could solve the problem that high-rate performance of the graphite is relative bad. Because the graphene is used as an electronic transmission buffer layer in a graphite composite material, the cycle performance of the graphite composite material is improved. In addition, the introduction of the graphene could effectively restrain the gather of graphite particles in a heat treatment process, and simultaneously, the Li-ion diffusion coefficient in the graphene-doped graphite composite material is increased. The graphene prepared according to the invention has higher specific surface area, and therefore, the high-rate performance of the graphite could be further improved.

Description

technical field [0001] The invention relates to lithium ion battery negative electrode materials, in particular to a preparation method of graphene-doped and carbon-coated modified graphite negative electrode materials. Background technique [0002] With the development of the automobile industry, the depletion of non-renewable fossil fuels such as oil and natural gas has attracted increasing attention, and air pollution and room temperature effects have also become global problems. In order to solve energy problems and achieve low-carbon environmental protection, based on the current level of energy technology development, electric vehicle technology has gradually become the focus of global economic development. The United States, Japan, Germany, China and other countries have successively restricted the use of fuel vehicles and vigorously developed electric vehicles. As the core component of electric vehicles, the power battery has also ushered in a great opportunity for d...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/62H01M10/0525
CPCH01M4/587H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 田东
Owner 田东
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