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A kind of current collector and application

A current collector and protective layer technology, applied in current collectors and application fields, can solve problems such as current drop, resistance increase, and collector performance drop

Active Publication Date: 2021-05-04
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, some temperature-sensitive materials are coated on the surface of the current collector to form a protective layer, such as PTC materials. If a short circuit occurs inside the battery, the temperature rises rapidly. At this time, the internal resistance of the battery will increase, and the current will drop, thereby achieving Suppress and cut off the current to improve the safety performance of the battery. However, the coating of these temperature-sensitive materials on the surface of the current collector will lead to a decrease in the electrical conductivity of the current collector.

Method used

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  • A kind of current collector and application
  • A kind of current collector and application
  • A kind of current collector and application

Examples

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preparation example Construction

[0043]The present invention also provides a method for preparing a current collector according to any of the above embodiments, comprising the following steps: depositing or coating a material containing a phthalocyanine compound on at least one surface of the conductive layer to form a protective layer , to obtain the current collector.

[0044] Specifically, the method for preparing the above-mentioned current collector can be realized through the following implementation methods.

[0045] In one embodiment, the phthalocyanine compound can be deposited on at least one surface of the conductive layer by means of physical vapor deposition to form a protective layer to obtain a current collector.

[0046] In another embodiment, the materials contained in the protective layer can be mixed with a solvent to form a solution, and the protective layer is formed on at least one surface of the conductive layer by coating the solution, and the solvent is evaporated to obtain a current ...

Embodiment 1

[0056] Deposit 1.6g copper phthalocyanine on the upper surface of the copper foil by a vacuum coating machine to form a protective layer with a thickness of 0.01 μm to obtain a current collector. The structure of the current collector is the same as figure 1 The same, its number is 1#. Among them, the coating process parameters are: the evaporation current is 90A, the vacuum degree of the vacuum chamber is 5×10 -5 Pa.

Embodiment 2-16

[0058] The preparation method of the current collector and the structure of the current collector in Example 2-16 are basically the same as in Example 1, the difference is: the thickness of the protective layer, the thickness of the conductive layer, the type of phthalocyanine compound and the serial number of the current collector, See Table 1 for details.

[0059] Table 1

[0060]

[0061]

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Abstract

The present invention relates to a current collector and its application. The current collector includes a conductive layer and a protective layer provided on at least one surface of the conductive layer, and the protective layer contains a phthalocyanine compound. The current collector provided by the present invention is provided with a protective layer containing a phthalocyanine compound on at least one surface of the conductive layer of the current collector. The protective layer can prevent the lithium-ion battery from thermal runaway and improve the safety performance of the lithium-ion battery when abnormal conditions occur. ; At the same time, the current collector with the above protective layer also has good electrical conductivity, thereby reducing the internal resistance of the lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a current collector and its application. Background technique [0002] Due to the advantages of high energy density, high power density, and low environmental pollution, lithium-ion batteries have been widely used in electronic products, electric vehicles, and energy storage. However, under some abuse conditions (such as acupuncture, extrusion and collision, etc.), the lithium-ion battery will cause an internal short circuit, which will cause its internal temperature to rise rapidly, which will cause a safety accident. Therefore, the safety performance of lithium-ion batteries is subject to increasing Come higher attention. [0003] At present, the research direction of the safety performance of lithium-ion batteries lies in the structure of the battery, among which, the improvement of a small number of battery structures focuses on the structure of the battery cur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/13H01M50/593H01M10/0525H01M10/058
CPCH01M4/13H01M4/667H01M10/0525H01M10/058H01M50/581Y02E60/10Y02P70/50
Inventor 赵伟李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD