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Current collector and preparation method and application thereof

A technology of current collectors and functional membranes, applied in electrode current collector coating, electrode manufacturing, electrode carrier/current collector, etc., can solve the problem of low safety performance of lithium-ion batteries, reduce weight, improve energy density, improve The effect of safety features

Active Publication Date: 2020-04-21
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a current collector and a preparation method thereof, which are used to solve the problem of low safety performance of lithium-ion batteries in the prior art

Method used

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  • Current collector and preparation method and application thereof
  • Current collector and preparation method and application thereof
  • Current collector and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] In the current collector provided in this embodiment, the functional film layer is obtained from 90 parts of polyethylene terephthalate PET and 10 parts of antimony trioxide, and a metal aluminum layer is provided on the upper surface and the lower surface of the functional film layer for use as The positive electrode current collector material is provided with a metal copper layer on the upper surface and the lower surface of the functional film layer to be used as the negative electrode current collector material.

[0055] The current collector can be prepared as follows:

[0056] 1) Melt and knead 90 parts of polyethylene terephthalate PET and 10 parts of antimony trioxide at 265°C for 20 minutes to obtain a mixed slurry, which is sequentially extruded, stretched, and cooled to obtain a thickness It is a functional film layer of 1 μm.

[0057] After testing, the flame retardant grade of the functional film layer is V1 grade, and the oxygen index is 28.

[0058] 2) ...

Embodiment 2-1

[0070] In the current collector provided in this embodiment, the functional film layer is obtained from 99 parts of polypropylene PP and 1 part of zinc phosphate, and a metal aluminum layer is set on the upper surface and the lower surface of the functional film layer as a positive electrode current collector material. A metal copper layer is arranged on the upper surface and the lower surface of the film layer to be used as a negative electrode current collector material.

[0071] The current collector can be prepared as follows:

[0072] 1) Melt and knead 99 parts of polypropylene PP and 1 part of zinc phosphate at 170°C for 30 minutes to obtain a mixed slurry, which is sequentially extruded, stretched, and cooled to obtain a functional film layer with a thickness of 5 μm.

[0073] The flame retardant grade of the tested functional film layer is V2, and the oxygen index is 26.

[0074] 2) A metal aluminum layer with a thickness of 2 μm was plated on both sides of the functi...

Embodiment 2-2

[0079] In the current collector provided in this embodiment, the functional film layer is obtained by 95 parts of polypropylene PP and 5 parts of zinc phosphate, and a metal aluminum layer is set on the upper surface and the lower surface of the functional film layer as the positive electrode current collector material. A metal copper layer is arranged on the upper surface and the lower surface of the film layer to be used as a negative electrode current collector material.

[0080] The current collector can be prepared as follows:

[0081] 1) Melt and knead 95 parts of polypropylene PP and 5 parts of zinc phosphate at 170°C for 30 minutes to obtain a mixed slurry, which is sequentially extruded, stretched, and cooled to obtain a functional film layer with a thickness of 5 μm.

[0082] The flame retardant grade of the tested functional film layer is V1, and the oxygen index is 28.

[0083] 2) The upper surface and the lower surface of the functional film layer are respectivel...

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Abstract

The invention provides a current collector and a preparation method and application thereof. The current collector comprises a functional film layer and metal layers arranged on the upper surface andthe lower surface of the functional film layer, wherein the functional film layer comprises a flame retardant. According to the current collector and the preparation method thereof, the flame retardant is added into the functional film layer so that the ignition point can be effectively reduced, the flame retardant can be released into electrolyte from the current collector at high temperature toachieve an active fire extinguishing effect, and the safety performance of the battery is remarkably improved; the functional film layer can also bear the metal layers on the upper surface and the lower surface, the weight of the current collector is reduced and the energy density of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a current collector and a preparation method and application thereof. Background technique [0002] Because lithium-ion batteries have the characteristics of high energy density and high power density, their application prospects are very broad. For example, lithium-ion batteries have been widely used in the fields of consumer electronics, electric vehicles, and energy storage. [0003] Conventional lithium-ion battery current collectors use metal foil, the positive electrode usually uses metal aluminum foil, and the negative electrode usually uses metal copper foil. An internal short circuit will cause a safety accident, which poses a great safety hazard to the use of lithium-ion batteries. [0004] Therefore, how to improve the safety performance of lithium-ion batteries has received more and more attention. Contents of the invention [0005] The inven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/139H01M10/0525H01M10/42A62C3/16
CPCH01M4/667H01M4/661H01M4/139H01M10/0525H01M10/4235A62C3/16Y02E60/10H01M10/052H01M10/42H01M4/668H01M4/0404
Inventor 赵伟李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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