Lithium battery containing current collector and preparation method thereof

Abstract

The invention discloses a lithium battery with novel current collectors and a preparation method of the lithium battery with the novel current collectors. The lithium battery comprises a positive pole piece, a diaphragm and a negative pole piece. The positive pole piece comprises a novel positive pole current collector in a multi-layer structure, the positive pole current collector comprises a first plastic film, and each of upper and lower surfaces of the first plastic film is coated with a first adhesion reinforcement layer, an aluminum metal plating layer and a first antioxidant layer sequentially. The negative pole piece comprises a novel negative pole current collector in a multi-layer structure, the negative pole current collector comprises a second plastic film, and each of upper and lower surfaces of the second plastic film is coated with a second adhesion reinforcement layer, a copper metal plating layer and a second antioxidant layer sequentially. The preparation method includes: laminating the positive pole piece, the diaphragm and the negative pole piece, packaging through aluminum-plastic films, injecting an appropriate amount of electrolyte, and subjecting the aluminum-plastic films to hot-press packaging. The lithium battery has advantages that light weight, energy density improvement and cost reduction of the battery can be realized, and copper / aluminum plating layers are less prone to shedding and oxidization.

Description

technical field

[0001] The invention relates to a lithium battery containing a current collector and a preparation method thereof. Background technique

[0002] The negative current collector of traditional lithium-ion batteries is copper foil, and the 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 copper / aluminum foil (the total mass of positive and negative current collectors accounts for about 14%-18% of the total mass of the battery) can realize the lightweight of lithium-ion batteries, increase energy density, and reduce costs, but due to the limitations of preparation technology , the thickness of copper / aluminum foil is difficult to reduce (currently copper foil can be mass-produced to 6μm, and aluminum foil can be mass-produced to 8μm); in addition, after the copper / aluminum foil becomes thinner, the mech...

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