A kind of positive current collector, its preparation method and application
A technology of positive electrode current collector and plastic film, applied in the field of positive electrode current collector, can solve the problems of reducing the service life of lithium ion battery, falling off of aluminum plating layer, falling off of aluminum plating layer, etc. The effect of compaction density
Active Publication Date: 2020-05-19
CONTEMPORARY AMPEREX TECH CO +1
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Problems solved by technology
However, the thickest thickness of its aluminum plating is up to 2.0 μm (a certain thickness is required to achieve satisfactory conductivity), which is much thicker than the thickness of the traditional packaging material aluminized film coating, and the thicker the coating, the better the aluminum coating. The easier the layer comes off the plastic
[0004] In addition, the surface of the aluminum foil needs anti-oxidation treatment, because the aluminum foil is directly in contact with the positive 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 aluminum plating on the plastic, the traditional anti-oxidation method is easy to cause the aluminum coating to fall off
Method used
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Embodiment 1
[0036] A method for preparing a positive current collector, comprising the steps of:
[0037] 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 electron beam evaporation 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, using electron gun to accelerate electron bombardment collision evaporation raw material Al 2 o 3 , adjust the unwinding speed, winding speed and evaporation, Al 2 o 3 Absorb heat and vaporize, forming a layer of Al on the surface of the moving film 2 o 3 Plating layer, that is, the adhesion enhancing layer;
[0038] S2. Al plating obtained in S1 2 o 3The film is placed in the vacuum chamber of the double-sided reciprocating evaporation coating machine, the vacuum chamber is sealed, and the vacuum is vacuumed step by step until the ...
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Abstract
The invention discloses a positive current collector, its preparation method and application thereof. The positive current collector has a multi-layer structure, including a plastic film, and the upper and lower surfaces of the plastic film are sequentially coated with an adhesion enhancing layer, an aluminum metal Coating and anti-oxidation layer. The preparation method comprises mainly using an evaporation coating process to sequentially plate an adhesion enhancing layer, an aluminum metal coating and an anti-oxidation layer; the application of the positive current collector is mainly in lithium ion batteries. The positive current collector of the invention can not only reduce the weight of the battery, increase the energy density, but also prevent the aluminum plating layer from falling off and oxidizing.
Description
technical field [0001] The invention relates to a positive current collector, its preparation method and application. Background technique [0002] The traditional lithium-ion battery positive current collector is aluminum 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 aluminum foil can reduce the weight of lithium-ion batteries and increase energy density. However, due to the limitations of the preparation technology, it is difficult to reduce the thickness of the aluminum foil (currently the aluminum foil can be mass-produced to 8μm); in addition, after the aluminum 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, aluminum is plated on plastic (such as PET) as a current collector to increase the energy density of the battery, r...
Claims
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IPC IPC(8): H01M4/66H01M10/0525H01M10/058B32B7/12B32B15/08B32B15/20B32B33/00
CPCB32B7/12B32B15/08B32B15/20B32B33/00H01M4/661H01M4/667H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 严佐毅刘文卿
Owner CONTEMPORARY AMPEREX TECH CO