Functional copper foil based on graphene and preparation method thereof

A technology of graphene and copper foil, applied in the direction of electrode carrier/collector, electrical components, battery electrodes, etc., can solve the problems of battery drum shell, explosion, short circuit, etc., achieve improved safety, simple preparation method, and improved conductivity and the effect of thermal performance

Inactive Publication Date: 2015-05-06
SHANGHAI YUEDA NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional lithium-ion battery electrodes often have exposed foil during the preparation process. If copper foil is exposed on the negative electrode, it will cause battery bulges, short circuits, etc., and then there may be explosions and fires.

Method used

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  • Functional copper foil based on graphene and preparation method thereof
  • Functional copper foil based on graphene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Weigh graphene, conductive carbon black, and pvdf according to the weight ratio of 80:10:10, disperse in NMP at 30°C for 4 hours, and set aside;

[0023] (2) Scrape-coat the dispersed slurry of (1) on the surface of copper foil, and dry at 90°C.

[0024]

Embodiment 2

[0026] (1) Weigh graphene, carbon nanotubes, conductive carbon black, and pvdf according to the weight ratio of 70:10:10:10, and disperse them in NMP at 50°C for 2 hours before use;

[0027] (2) Scrape-coat the dispersed slurry in (1) on the surface of copper foil, and dry at 100°C.

[0028]

Embodiment 3

[0030] (1) Weigh graphene, carbon nanotubes, conductive carbon black, and pvdf according to the weight ratio of 70:10:10:10, and disperse them in NMP at 40°C for 5 hours before use;

[0031] (2) Roll the dispersed paste (1) onto the surface of the copper foil and dry it at 100°C.

[0032]

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Abstract

The invention discloses a functional copper foil based on graphene and a preparation method thereof. The functional copper foil based on graphene comprises a copper foil and a material coating containing graphene. The functional copper foil with the surface uniformly coated with a graphene mixed material is used to replace a copper foil as a lithium ion battery anode current collector, the lithium storage characteristic of graphene is utilized, the foil exposure phenomenon of the current collector in the process of coating the battery material is eliminated, the safety accident incidence during usage of a lithium ion battery is reduced, the integral safety of the lithium ion battery is improved, and the electric conductivity and the heat radiation performance of a lithium ion battery electrode are improved. The provided functional copper foil based on graphene eliminates the foil exposure probability during electrode preparation, and improves the integral safety of the battery. Also, the preparation method of the functional copper foil based on graphene is simple, and easy for realizing industrialization and continuous production.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a graphene-based functional copper foil and a preparation method thereof. Background technique [0002] As a high-performance secondary green battery, lithium-ion batteries have the advantages of high voltage, high energy density, low self-discharge rate, wide temperature range, long cycle life, environmental protection, no memory effect, and high current charge and discharge. In recent years, the application field of lithium-ion batteries has gradually expanded from digital products such as mobile phones and digital cameras to new application fields such as new energy vehicles, electric tools, and energy storage. The performance requirements for lithium-ion batteries have become more stringent. Applications in new fields require that the defects or deficiencies of lithium-ion batteries must be improved. [0003] A lithium ion battery includes at least one set of positive an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66
CPCH01M4/661H01M4/663H01M4/667Y02E60/10
Inventor 黎阳谢华清成信刚
Owner SHANGHAI YUEDA NEW MATERIAL TECH
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