A positive pole piece and electrochemical device

Abstract

The invention relates to a positive pole piece and an electrochemical device. The positive electrode sheet includes a current collector, a positive electrode active material layer, and a glue layer arranged between the current collector and the positive electrode active material layer, and the glue layer includes a polymer material, a conductive material and an inorganic filler, wherein the polymer material contains The adhesive layer matrix, the adhesive layer matrix is ​​an oily polymer material whose solubility in NMP at 130° C. within 5 minutes is 30% or less of that of PVDF under the same conditions. The positive electrode sheet can improve the nail penetration safety of electrochemical devices (such as capacitors, primary batteries or secondary batteries, etc.) under abnormal conditions such as nail penetration.

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] 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. 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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