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Cathode current collector, and preparation method and application of cathode current collector

A current collector and negative electrode technology, which is applied in the field of negative electrode current collectors, can solve the problems of reducing the service life of lithium-ion batteries, copper plating shedding, copper plating shedding, etc., and achieves the problems of copper plating shedding, strong tensile strength, and reduced shedding Effect

Active Publication Date: 2017-11-21
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thickness of its copper plating is as high as 1.5μm (a certain thickness is required to achieve satisfactory conductivity), which is much thicker than the thickness of the copper plating film of traditional packaging materials, and the thicker the plating, the better the copper plating. The easier the layer comes off the plastic
[0004] In addition, the surface of the copper foil needs anti-oxidation treatment, because the copper foil is directly in contact with the negative electrode material, and after a long time, it will be corroded by the electrolyte, thereby reducing the service life of the lithium-ion battery
We found that after direct copper plating on the plastic, the traditional anti-oxidation method is easy to cause the copper plating to fall off

Method used

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  • Cathode current collector, and preparation method and application of cathode current collector

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Embodiment 1

[0044] A preparation method of a negative electrode current collector, comprising the steps of:

[0045] S1. First, corona treatment is performed on the surface of the plastic film to be coated, and then the reel plastic film is placed in the vacuum chamber of the double-sided reciprocating magnetron sputtering coating machine, the vacuum chamber is sealed, and the vacuum is gradually evacuated until the vacuum degree reaches 3× 10 -3 -6×10 -3 Pa, double-sided back-and-forth high-efficiency coating on the plastic film by magnetron sputtering, the target material is nickel, the purity is ≥99.9%, adjust the unwinding speed and winding speed, and the sputtered nickel atoms form a layer on the moving film Nickel-plated layer, that is, the adhesion-enhancing layer;

[0046] S2. Put the nickel-plated film obtained in S1 into the vacuum chamber of the double-sided reciprocating evaporation coating machine, seal the vacuum chamber, and evacuate step by step until the vacuum degree r...

Embodiment 2

[0050] A preparation method of a negative electrode current collector, comprising the steps of:

[0051] S1. First, corona treatment is performed on the surface of the plastic film to be coated, and then the reel plastic film is placed in the vacuum chamber of the double-sided reciprocating magnetron sputtering coating machine, the vacuum chamber is sealed, and the vacuum is gradually evacuated until the vacuum degree reaches 3× 10 -3 -6×10 -3 Pa, double-sided back-and-forth high-efficiency coating on the plastic film by magnetron sputtering, the target material is nickel, the purity is ≥99.9%, adjust the unwinding speed and winding speed, and the sputtered nickel atoms form a layer on the moving film Nickel-plated layer, that is, the adhesion-enhancing layer;

[0052] S2. Put the nickel-plated film obtained in S1 into the vacuum chamber of the double-sided reciprocating evaporation coating machine, seal the vacuum chamber, and evacuate step by step until the vacuum degree r...

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Abstract

The invention discloses a cathode current collector, and a preparation method and an application of the cathode current collector. The cathode current collector is in a multilayer structure, and comprises a plastic film, wherein the upper and lower surfaces of the plastic film are sequentially coated with bonding force reinforcement layers, copper coating layers and antioxidation layers. The preparation method comprises the steps of coating the bonding force reinforcement layers on the plastic film by utilizing a magnetron sputtering coating technology, coating the copper coating layers by utilizing an evaporation coating technology, and coating the antioxidation layers by utilizing an electron beam evaporation coating technology or the magnetron sputtering coating technology. The application of the cathode current collector is mainly in a lithium ion battery. The cathode current collector can realize lightweighting of the battery, improves the energy density, lowers the cost, and can reduce the possibility of falling and oxidation of the copper coating layers.

Description

technical field [0001] The invention relates to a negative electrode current collector, its preparation method and application. Background technique [0002] The negative current collector of traditional lithium-ion batteries is copper foil. With the development of lithium battery technology, high energy density, light weight and flexibility of lithium ion batteries have become people's pursuit. Thinning copper foil can reduce the weight of lithium-ion batteries, increase energy density, and reduce costs. However, due to the limitations of the preparation technology, it is difficult to reduce the thickness of the copper foil (the copper foil can be mass-produced to 6 μm at present); in addition, after the copper foil is thinned, the mechanical strength decreases, resulting in a decrease in processing performance, so a new "thinning technology" is needed ". [0003] In the prior art, copper is plated on plastic (such as PET) as a current collector to increase the energy de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/66
CPCH01M4/0404H01M4/0426H01M4/661H01M4/662H01M4/664H01M4/667H01M4/70H01M10/0525C01B21/06C23C14/081C23C14/205C23C14/30C23C14/35C23C14/562C23C14/568H01M4/668H01M2004/028Y02E60/10C23C14/022C23C14/025C23C14/185C23C14/3414C08F10/06C08F14/06C01B32/956H01M10/052
Inventor 邱洪礼
Owner CONTEMPORARY AMPEREX TECH CO
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