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Positive current collector, positive pole piece and electrochemical device

A technology of positive current collectors and positive pole pieces, which is applied in the fields of positive current collectors, positive pole pieces and electrochemical devices, can solve the problems of not being able to effectively control the internal short circuit of the battery, short circuit heat generation, and unsatisfactory battery safety, and achieve good performance. Nail penetration safety performance, high nail penetration safety performance, weight reduction effect

Pending Publication Date: 2021-01-05
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing technology cannot effectively control the internal short circuit and short circuit heat generation of the battery, and the safety of the battery cannot meet the increasingly high requirements of the market.

Method used

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  • Positive current collector, positive pole piece and electrochemical device
  • Positive current collector, positive pole piece and electrochemical device
  • Positive current collector, positive pole piece and electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0135] The following examples describe the present disclosure more specifically, and these examples are for illustrative purposes only, since various modifications and changes within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are based on weight, and all reagents used in the examples are commercially available or synthesized according to conventional methods, and can be directly The instruments used without further processing, as well as in the examples, are commercially available.

[0136] Preparation

[0137] Preparation of positive electrode current collector

[0138] Select a support layer with a predetermined thickness and carry out surface cleaning treatment, place the support layer after surface cleaning treatment in a vacuum coating room, melt and evaporate the high-purity aluminum wire in the metal evaporation room at a high temperat...

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Abstract

The invention discloses a positive pole current collector, a positive pole piece and an electrochemical device. The positive pole current collector comprises a support layer and a conductive layer arranged on the support layer, the conductive layer is made of aluminum or aluminum alloy, and the thickness D1 of the conductive layer is greater than or equal to 300nm and less than or equal to 2mu m;the elongation at break B of the supporting layer is greater than or equal to 12% and greater than or equal to 10000%; the volume resistivity of the supporting layer is greater than or equal to 1.0 *10 <5> ohm.m; when the tensile strain of the positive electrode current collector is 2%, the square resistance growth rate T1 of the conductive layer is less than or equal to 10%. The positive electrode current collector provided by the invention can give consideration to relatively high safety performance and electrical performance at the same time, so that the positive electrode piece and the electrochemical device adopting the positive electrode current collector can give consideration to relatively high safety performance and electrochemical performance at the same time.

Description

technical field [0001] The invention belongs to the technical field of electrochemical devices, and in particular relates to a positive electrode current collector, a positive electrode sheet and an electrochemical device. Background technique [0002] Due to the advantages of high energy density, high output power, long cycle life and low environmental pollution, lithium-ion secondary batteries are widely used in electric vehicles and consumer electronics products. However, when the lithium-ion secondary battery is subjected to abnormal conditions such as nail penetration, it is easy to cause a short circuit in the battery. At this time, the battery generates a large current and is accompanied by a large amount of heat generated by the short circuit, which is likely to cause the battery to smoke, catch fire, or even explode. Security risks. [0003] In the prior art, separators with high puncture strength are used to avoid internal short circuits in batteries, or the hazar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/661H01M4/662H01M4/667H01M10/0525H01M4/668H01M4/366Y02E60/10H01M4/664H01M2004/021H01M2004/028
Inventor 梁成都黄起森王铈汶
Owner CONTEMPORARY AMPEREX TECH CO
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