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Activation method of high-capacity lithium ion battery negative electrode material

A technology of lithium ion battery and activation method, which is applied in the field of activation of negative electrode materials of high capacity lithium ion battery, can solve the problems of low power density, inability to charge and discharge rapidly, etc., to increase power density, improve catalytic reaction active sites, The effect of improving capacity and cycle performance

Active Publication Date: 2018-05-22
HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most lithium-ion batteries have low power density and cannot be charged and discharged quickly, which limits their application to a certain extent.

Method used

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  • Activation method of high-capacity lithium ion battery negative electrode material
  • Activation method of high-capacity lithium ion battery negative electrode material
  • Activation method of high-capacity lithium ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The present embodiment activates the three-dimensional graphene / foam nickel of lithium-ion battery negative electrode material according to the following steps:

[0031] 1) Ultrasonic disperse graphene oxide in water to obtain a 1 mg / mL graphene oxide aqueous solution; then form a film of graphene oxide aqueous solution at 60°C in nickel foam by drop-coating method, and obtain a three-dimensional oxide film after standing for 72 hours Graphene / nickel foam attachment material, drying;

[0032] 2) Spray the graphene oxide aqueous solution on the dried three-dimensional graphene oxide / nickel foam attachment material, and then dry it for use;

[0033] 3) Immerse the dried three-dimensional graphene oxide / nickel foam material in step 2) in 1.2 mol / L NaI aqueous solution, ultrasonic treatment time is 3h, and then stand until the activator solution is completely clarified, then take out the composite material;

[0034] 4) After drying the composite material in step 3), put it...

Embodiment 2

[0039] The present embodiment activates the three-dimensional graphene / copper foam of lithium-ion battery negative electrode material according to the following steps:

[0040] 1) Ultrasonically disperse graphene oxide in water to obtain a 2 mg / mL graphene oxide aqueous solution; then form a film of graphene oxide aqueous solution at 90 ° C in foamed copper by drop-coating method, and obtain a three-dimensional oxide after standing for 16 hours Graphene / copper foam attachment material, drying;

[0041] 2) Spray the graphene oxide aqueous solution on the dried three-dimensional graphene oxide / copper foam attachment material, and then dry it for use;

[0042] 3) Immerse the dried three-dimensional graphene oxide / copper foam attachment material in step 2) in 1.5 mol / L KI aqueous solution, ultrasonic treatment time is 5h, and then stand until the activator solution is completely clarified, then take out the composite material;

[0043] 4) After the composite material in step 3) i...

Embodiment 3

[0046] The present embodiment activates the three-dimensional graphene / foam nickel of lithium-ion battery negative electrode material according to the following steps:

[0047]1) Ultrasonic disperse graphene oxide in water to obtain a 4 mg / mL graphene oxide aqueous solution; then form a film of graphene oxide aqueous solution at 70°C in nickel foam by drop-coating method, and obtain a three-dimensional film after standing for 32 hours Graphene oxide / nickel foam attachment material, drying;

[0048] 2) Spray the graphene oxide aqueous solution on the dried three-dimensional graphene oxide / nickel foam attachment material, and then dry it for use;

[0049] 3) Immerse the dried three-dimensional graphene oxide / nickel foam attachment material in step 2) in 1.8 mol / L NaBr aqueous solution, ultrasonic treatment time is 4h, and then stand until the activator solution is completely clarified, then take out the composite material;

[0050] 4) After drying the composite material in step...

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Abstract

The invention provides an activation method of a high-capacity lithium ion battery negative electrode material. The activation method comprises the following steps of 1) performing film formation on agraphene oxide aqueous solution in a porous template by a drop-coating method, and allowing to stand; 2) spraying the graphene oxide aqueous solution onto the dried three-dimensional graphene oxide / template attachment material, and drying for use; 3) impregnating the material in an aqueous solution dissolved with an activation agent, and allowing to stand after ultrasonic processing; and 4) placing the product in a tubular furnace for oxygen-free sintering after drying, cooling the sintered product to a room temperature, washing the product with deionized water until washing water is neutral,and drying, thereby obtaining the activated graphene / template negative electrode material. By the activation method, the inherent characteristic of a two-dimensional graphene sheet is maintained, meanwhile, graphene and the porous template are more uniformly distributed, the active sites of graphene phase-template phase-electrolyte phase catalytic reaction are remarkably improved, and the power density and the cycle rate performance are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an activation method for anode materials of high-capacity lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long service life and no memory effect, and are widely used in the field of energy storage. However, most lithium-ion batteries have low power density and cannot be charged and discharged quickly, which limits their application to a certain extent. Compared with the planar two-dimensional graphene electrode, the three-dimensional graphene negative electrode material has a higher specific surface area, which can provide a larger interface for the lithium ion reaction, reduce the polarization phenomenon of the interface reaction, and maintain high capacity. Contents of the invention [0003] Aiming at the shortcomings of the prior art, the invention provides a method for act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/0525C01B32/184
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 饶媛媛
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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