Positive pole piece and electrochemical device

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 an adhesive layer arranged between the current collector and the positive active material layer, wherein the adhesive layer comprises a polymer material, a conductive material and an inorganic filler, the polymer material comprises an adhesive layer matrix, and the adhesive layer matrix is an oily polymer material of which the solubility in NMP at the temperature of 130 DEG C within 5min is 30% or less of the solubility of PVDF under the same condition. The positive pole piece can improve the nail penetration safety of an electrochemical device (such as a capacitor, a primary battery or a secondary battery) under abnormalconditions such as nail penetration.

Description

Technical field [0001] The present invention belongs to the field of electrochemical technology. More specifically, the present invention relates to a positive pole piece and an electrochemical device including the positive pole piece. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and consumer electronic products due to their advantages of high energy density, high output power, long cycle life and low environmental pollution. However, lithium-ion batteries are prone to catch fire and explode when subjected to abnormal conditions such as squeezing, collision, or puncture, causing serious harm. Therefore, the safety issues of lithium-ion batteries have greatly restricted the application and popularization of lithium-ion batteries. [0003] Although researchers have proposed many methods to improve the safety of batteries, there is still a lack of very effective means for the safety hazards caused by the puncture of the battery. In view of...

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Problems solved by technology

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 harm

Therefore, the safety problems of lithium-ion batteries have largely limited the application and popularization of lithium-ion batteries.

[0003] Although researchers have proposed many methods to improve the safety of batteries, there is still a lack of very effective means for the potential safety hazards caused by battery punctures.

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