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A current collector and its preparation method and application

A technology of current collectors and semiconductors, applied in the field of current collectors and their preparation, can solve the problem of not being able to take both safety performance and rate performance into consideration, and achieve the effects of taking both safety performance and rate performance into consideration, improving safety performance, and improving energy density.

Active Publication Date: 2022-03-01
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 that lithium-ion batteries in the prior art cannot take into account both safety performance and rate performance

Method used

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  • A current collector and its preparation method and application
  • A current collector and its preparation method and application
  • A current collector and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In the current collector provided in this embodiment, the composite film layer is obtained by 99 parts of polyethylene terephthalate PET and 1 part of silicon, wherein the particle diameter of silicon is 10 nm, and the composite film layer is on the upper surface and the lower surface A metal aluminum layer is arranged as a positive electrode current collector material, and a metal copper layer is arranged on the upper surface and the lower surface of the composite film layer as a negative electrode current collector material.

[0050] The current collector can be prepared as follows:

[0051] 1) Melting and kneading the raw materials of the above-mentioned composite film layer to obtain a slurry, and extruding through an extrusion device to obtain a composite film layer with a thickness of 3 μm.

[0052] After testing, the normal temperature (25°C) sheet resistance R1 of the composite film layer is 1.17*10 9 Ω / sq.

[0053] 2) A 2 μm thick metal aluminum layer is coat...

Embodiment 2

[0058] In the current collector provided in this embodiment, the composite film layer is obtained by 99 parts of polyethylene terephthalate PET and 1 part of silicon, wherein the particle diameter of silicon is 100 nm, and the composite film layer is on the upper surface and the lower surface A metal aluminum layer is arranged as a positive electrode current collector material, and a metal copper layer is arranged on the upper surface and the lower surface of the composite film layer as a negative electrode current collector material.

[0059] The current collector can be prepared as follows:

[0060] 1) Melting and kneading the raw materials of the above-mentioned composite film layer to obtain a slurry, and extruding through an extrusion device to obtain a composite film layer with a thickness of 3 μm.

[0061] After testing, the normal temperature (25°C) sheet resistance R1 of the composite film layer is 1.62*10 9 Ω / sq.

[0062] 2) A 2 μm-thick metal aluminum layer is coa...

Embodiment 3

[0067] In the current collector provided in this embodiment, the composite film layer is obtained by 99 parts of polyethylene terephthalate PET and 1 part of silicon, wherein the particle diameter of silicon is 500nm, and the composite film layer is on the upper surface and the lower surface A metal aluminum layer is arranged as a positive electrode current collector material, and a metal copper layer is arranged on the upper surface and the lower surface of the composite film layer as a negative electrode current collector material.

[0068] The current collector can be prepared as follows:

[0069] 1) Melting and kneading the raw materials of the above-mentioned composite film layer to obtain a slurry, and extruding through an extrusion device to obtain a composite film layer with a thickness of 3 μm.

[0070] After testing, the normal temperature (25°C) sheet resistance R1 of the composite film layer is 2.31*10 9 Ω / sq.

[0071] 2) A 2 μm thick metal aluminum layer is coat...

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Abstract

The invention provides a current collector, its preparation method and application. The present invention provides a current collector, which includes a composite film layer and metal layers arranged on the upper surface and the lower surface of the composite film layer; wherein, the composite film layer includes polymer and semiconductor powder materials. The current collector and its preparation method provided by the present invention adopt a composite film layer as the substrate of the current collector, wherein the composite film layer includes polymer and semiconductor powder materials, and the polymer can cut off the current when the current collector is short-circuited to increase the lithium ion density. The safety performance of the battery; and the semiconductor material makes the composite film have the properties of a semiconductor, which improves the electronic conductivity of the composite film, so that the lithium-ion battery can take into account both safety performance and rate performance.

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. 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. [0003] At present, a current collector that can improve the safety performance of lithium-ion batteries has been developed, specifically, a metal layer is placed on the upper ...

Claims

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Application Information

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