Positive pole piece and electrochemical device

A technology of positive electrode sheet and positive active material, applied in the field of electrochemistry, can solve the problems of loss of safety performance, loss of PTC effect of PTC layer, deterioration of electrical performance, etc.

Active Publication Date: 2020-05-26
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this improved mode, when the active material slurry is coated on the surface of the PTC material layer, the solvent in the slurry (such as NMP, etc.) will dissolve the PTC material in the PTC layer and enter the upper active material layer, not only Make the PTC layer lose the PTC effect, and it will deteriora

Method used

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  • Positive pole piece and electrochemical device
  • Positive pole piece and electrochemical device

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Embodiment

[0067] In order to make the object, technical solution and beneficial technical effect of the present invention clearer, the present invention will be further described in detail below in conjunction with examples. However, it should be understood that the embodiments of the present invention are only for explaining the present invention rather than limiting the present invention, and the embodiments of the present invention are not limited to the embodiments given in the specification. The experimental conditions not indicated in the examples adopt conventional conditions, or adopt the conditions recommended by material suppliers or equipment suppliers.

[0068] 1. Preparation method

[0069] 1.1 Preparation of positive electrode sheet

[0070] 1) Safety coating:

[0071] Depending on whether the polymer matrix material in the security coating is cross-linked or not, the security coating is prepared by one of the following two methods.

[0072] Without cross-linking the po...

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Abstract

The invention relates to a positive pole piece and an electrochemical device. The positive pole piece comprises a current collector, a positive active material layer and a safety coating arranged between the current collector and the positive active material layer, wherein the safety coating comprises a polymer matrix, a conductive material and an inorganic filler, and when the safety coating andthe positive active material layer are collectively called as a diaphragm layer, the ductility of the diaphragm layer is greater than or equal to 30%. The positive pole piece can improve the nail penetration safety performance of an electrochemical device (such as a capacitor, a primary battery or a secondary battery).

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and more specifically, the invention relates to a positive pole piece and an electrochemical device comprising the positive pole piece. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and consumer electronics due to their advantages such as high energy density, high output power, long cycle life and low environmental pollution. However, when lithium-ion batteries are subjected to abnormal conditions such as extrusion, collision or puncture, they are prone to fire and explosion, causing serious hazards. Therefore, the safety problems of lithium-ion batteries have largely limited the application and popularization of lithium-ion batteries. [0003] A large number of experimental results show that the short circuit in the battery is the root cause of the safety hazard of lithium-ion batteries. In order to avoid the short circuit in the battery, res...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/66H01M6/50H01M10/42H01G11/28
CPCH01M4/13H01M4/667H01M10/4235H01M6/50H01G11/28H01M2200/106H01M4/668Y02E60/13Y02E60/10H01G11/14H01G11/68H01G11/70H01M4/628H01M10/0525H01M2004/028H01M50/581
Inventor 曾毓群林永寿李振华金海族张小文
Owner CONTEMPORARY AMPEREX TECH CO
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