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Graphite lithium ion battery negative electrode material with multiple layers of graphene surfaces and preparation method thereof

A multi-layer graphene and lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor temperature controllability, low safety factor, and large material consumption, and achieve easy diffusion and lithium storage capacity Large, high conductivity effect

Active Publication Date: 2018-06-08
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main method for grapheneizing graphite in industry is to oxidize and corrode graphite with a strong oxidant. This method reacts violently in water solvent, has poor temperature controllability, low safety factor, and consumes a large amount of materials.

Method used

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  • Graphite lithium ion battery negative electrode material with multiple layers of graphene surfaces and preparation method thereof
  • Graphite lithium ion battery negative electrode material with multiple layers of graphene surfaces and preparation method thereof
  • Graphite lithium ion battery negative electrode material with multiple layers of graphene surfaces and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] A preparation method of a graphite lithium-ion battery negative electrode material with multilayer graphene on the surface, comprising the following steps:

[0029] (1) Take 0.5g of graphite samples and 8.42g of KNO in the particle size range of 10~50μm 3 , ball milled for 30 minutes until uniform without graininess, then weighed 12g of mixed salt a and continued ball milling evenly. The obtained mixture was sintered in a tube furnace at 360°C with a heating rate of 2°C / min for 6~12h in an air atmosphere, cooled to room temperature naturally, the obtained mixture was ball-milled for 2h, then washed with 3L deionized water, and vacuumed at 80°C. After drying for 12 hours, a graphite material with multi-layer graphene on the surface is obtained.

[0030] The specific preparation process of the mixed salt a is as follows: Weigh LiCl and KCl respectively according to a mass ratio of 1:1, and dissolve the weighed salt in water of 70 to 90 times the mass. Stir and heat at 6...

Embodiment 2

[0034] A negative electrode material and preparation method of graphite lithium ion battery with multilayer graphene on the surface, comprising the following steps:

[0035] (1) Take 0.5g and 4.21g KNO samples of graphite with a particle size range of 10~40μm 3 with 2.23g NH 4 Cl, ball milled for 30min, then weighed 12g of mixed salt a and continued ball milling evenly. The obtained mixture was sintered in a tube furnace at 360°C with a heating rate of 2°C / min for 6~12h in an air atmosphere, cooled to room temperature naturally, the obtained mixture was ball-milled for 2h, then washed with 3L deionized water, and vacuumed at 80°C. After drying for 12 hours, a graphite material with multi-layer graphene on the surface is obtained.

[0036] The specific preparation process of the mixed salt a is as follows: respectively weigh LiCl and KCl according to a mass ratio of 6:7, and dissolve the weighed salt in water of 70 to 90 times the mass. Stir and heat at 60~90°C for evaporati...

Embodiment 3

[0039] A negative electrode material and preparation method of graphite lithium ion battery with multilayer graphene on the surface, comprising the following steps:

[0040] (1) Take 0.5g and 4.21g KNO samples of graphite with a particle size range of 10~40μm 3 with 2.23g NH 4 Cl with 3.33g NH 4 NO 3, ball milled for 30min, then weighed 12g of mixed salt a and continued ball milling evenly. The obtained mixture was sintered in a tube furnace at 370°C with a heating rate of 2°C / min for 6-12h in an air atmosphere, cooled naturally to room temperature, ground for 2h, washed with 3L deionized water, and vacuum-treated at 80°C. After drying for 12 hours, a graphite material with multi-layer graphene on the surface is obtained.

[0041] The specific preparation process of the mixed salt a is as follows: respectively weigh LiCl and KCl according to a mass ratio of 5:7, and dissolve the weighed salt in water of 70 to 90 times the mass. Stir and heat at 60~90°C for evaporation, an...

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Abstract

The invention discloses a graphite lithium ion battery negative electrode material with multiple layers of graphene surfaces and a preparation method thereof, and belongs to the field of energy storage material preparation. Conventional graphite oxidation is performed in a water solvent; a large amount of corrosive acid and strong oxidants are needed; safety risk exists during the batch production. When molten salt is used as the solvent, the reaction temperature can be raised; the consumption of oxidants is reduced; meanwhile, the molten salt can be recovered and recycled. The safe and greenmolten salt method is used for performing high-temperature surface oxidation corrosion on crystalline flake graphite; the difficult-to-aggregate graphite negative electrode material with the graphenesurface is obtained, so that the material has in-situ multiple stratification; the electric conductance isotropy is enhanced; the electronic conductivity and the lithium embedding capability of the material are improved; the prepared material has good cycle performance.

Description

technical field [0001] The invention belongs to the field of preparation of energy storage materials, and in particular relates to a graphite lithium-ion battery negative electrode material with multilayer graphene on the surface and a preparation method thereof. Background technique [0002] Lithium battery, as the mainstream power battery for future development, has many advantages that traditional batteries do not have and has a large space for technological improvement and cost reduction. Therefore, the state issued subsidy policies for new energy vehicles from 2013 to 2015, which shows that the state attaches great importance to its development. [0003] Graphite material, as a lithium-ion anode material that has been commercialized at present, has abundant sources and stable electrochemical performance. Graphite anode materials have a large lithium storage capacity and a specific capacity close to the theoretical specific capacity, and have good electrical conductivit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 刘慧勇吴宏任璐李春雨
Owner FUZHOU UNIV
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