Lithium battery containing current collector and preparation method thereof

A current collector, lithium battery technology, applied in battery electrodes, secondary batteries, electrode carriers/current collectors, etc., can solve the problems of reducing the service life of lithium ion batteries, copper/aluminum coating peeling, electrolyte corrosion, etc. The effect of copper/aluminum coating peeling, reducing peeling, and high compaction density

Active Publication Date: 2020-05-15
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The surface of the copper / aluminum foil needs anti-oxidation treatment, because the copper / aluminum foil is in direct contact with the negative electrode / 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
In addition, we found that after the copper / aluminum plating on the plastic, the traditional anti-oxidation method is easy to cause the copper / aluminum coating to fall off

Method used

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  • Lithium battery containing current collector and preparation method thereof
  • Lithium battery containing current collector and preparation method thereof

Examples

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preparation example Construction

[0037] A method for preparing a positive current collector, comprising the steps of:

[0038] 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;

[0039] S2. Al plating obtained in S1 2 o 3 The 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...

Embodiment 1

[0055] A preparation method for a lithium battery containing a current collector, comprising the steps of:

[0056] S1. After the positive electrode current collector is prepared, the positive electrode slurry is coated on the positive electrode current collector, and the positive electrode sheet is obtained after vacuum drying; the positive electrode slurry is made of lithium iron phosphate (or lithium titanate, ternary material), Materials such as PVDF and C are added to the solvent N-methylpyrrolidone and mixed and stirred; among them, LiFePO 4 , The mass ratio of PVDF and C is 86%: 8%: 6%; the coating thickness of positive electrode slurry is 0.1-0.2mm;

[0057] S2. After the negative electrode collector is prepared, the negative electrode slurry is coated on the negative electrode collector, and the negative electrode sheet is obtained after vacuum drying; the negative electrode slurry is obtained by adding graphite, PVDF and VGCF to solvent water and mixing and stirring ...

Embodiment 2

[0061] Referring to Example 1, the difference from Example 1 is that in S1, the mass ratio of lithium iron phosphate (or lithium titanate, ternary material), PVDF and C is 88%: 7%: 5%; in S2, graphite The mass ratio of , PVDF and VGCF is 90%: 7%: 3%.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/662H01M4/667H01M10/0525Y02E60/10
Inventor 邱洪礼
Owner CONTEMPORARY AMPEREX TECH CO
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