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Carbon-coated aluminum foil for lithium ion batteries

A lithium-ion battery, carbon coating technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of reducing the bonding strength of the coating and aluminum foil and the stability of the current collector, unfavorable heat dissipation of the battery, difficult to coat uniformly, etc. problems, to achieve the effect of reducing surface free energy, high dispersion stability, and improving heat dissipation performance

Active Publication Date: 2019-06-25
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the low thermal conductivity of the conductive carbon material in the carbon-coated aluminum foil conductive coating in the prior art, which is not conducive to battery heat dissipation during use, and has poor dispersibility in water, which makes it difficult to coat evenly, reducing the To solve the problem of the bonding strength of the coating and the aluminum foil and the stability of the current collector, a carbon-coated aluminum foil for lithium-ion batteries is provided to improve the thermal conductivity of the conductive coating so that the conductive material can be evenly dispersed in the solvent and the binder. The paint can be evenly coated on the current collector, improving the bonding strength between the coating and the aluminum foil and the stability of the current collector

Method used

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Embodiment 1

[0037] The conductive agent, binder, solvent and dispersant are: graphene 5%, carbon nanotube 5%, layered conductive graphite 30%, polyacrylate 7%, epoxy resin 5%, water 47% according to mass percentage , HPA 1%, mixed, stirred evenly, printed on aluminum foil by anilox roller, dried at 60°C to obtain carbon-coated aluminum foil with a carbon-coated layer thickness of 1-3 μm on one side.

Embodiment 2

[0039] The conductive agent, binder, solvent and dispersant are: 18% graphene, 8% carbon nanotube, 4% layered conductive graphite, 10% carbon black, 7% acrylate, 7% polyurethane, water 45% and 1% polyvinylpyrrolidone are mixed, stirred evenly, printed on aluminum foil by anilox roller, dried at 60°C to obtain carbon-coated aluminum foil with a carbon-coated layer thickness of 1-3 μm on one side.

Embodiment 3

[0041] The conductive agent, binder, solvent and dispersant are: graphene 5%, carbon nanotube 5%, layered conductive graphite 5%, carbon black 5%, styrene-butadiene rubber 7%, carboxymethyl fiber according to mass percentage Mix 8% plain sodium, 50% water, 10% absolute ethanol, and 5% HPA, mix evenly, print on aluminum foil by anilox roller, dry at 60°C to obtain carbon-coated aluminum foil with a thickness of 1-3 μm on one side of the carbon-coated layer .

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Abstract

The invention relates to the technical field of current collectors for lithium ion batteries, and discloses a carbon-coated aluminum foil for lithium ion batteries. The coating products of the conductive coating of the carbon-coated aluminum foil include conductive agent, binder and solvent. The conductive agent includes graphene and at least one of carbon black, carbon nanotubes and layered conductive graphite. The binder includes at least one of polyacrylate, polyurethane, epoxy resin, polyacrylonitrile, styrene-butadiene rubber and sodium carboxymethyl cellulose. The solvent includes at least one of water and anhydrous ethanol. The carbon black and the graphene are modified by polyvinylpyrrolidone grafting. Graphene is used as a conductive agent, which can make the conductive coating have high thermal conductivity and improve the heat dissipation performance of batteries. Polyvinylpyrrolidone is grafted onto the surface of the conductive agent, which reduces the surface free energyof the conductive agent, increases the steric hindrance and makes the grafted and modified conductive agent have high dispersion stability.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery current collectors, in particular to a carbon-coated aluminum foil for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. With the development of the times, the application of lithium-ion batteries continues to expand in the market. In lithium-ion batteries, the current collector refers to the base metal used to attach the active material to the positive or negative electrode of the battery. The current collector is in contact with the active material to collect the current generated by the active material and output a large current to the outside. It can be seen that the quality of the contact between the current collector and the active material is an important factor affecting the charge and discharge ...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/62H01M10/0525
CPCY02E60/10
Inventor 王涌吴晨琰陆挺李凡群
Owner WANXIANG 123 CO LTD
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