Film applied to lithium ion batteries

Abstract

The invention discloses a film applied to lithium ion batteries. The film is used for covering the surface of a battery body, and is prepared from the following components: fatty acid methyl ester sulfonate, sodium tripolyphosphate, polyisobutene, bis-thiodipropionate, methanol polyoxyethylene ether phosphate, vinyl trimethoxy silane, benzoyl peroxide, ethyl acetoacetate, methyl vinyl ketone and propylene glycol methyl ether acetate. The film has double properties of insulation and heat conduction; after the film coveres on the surface of the battery body, the safety performance of the batterycan be effectively improved.

Description

technical field [0001] The present invention relates to thin films for lithium ion batteries. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density, high output power, long charge and discharge life, no pollution, wide operating temperature range and small self-discharge. As a new type of high-energy chemical power source, it has encountered the greatest challenge in the process of solving human environmental pollution and energy crisis, that is, safety issues. Lithium-ion batteries will cause internal short circuit or overcharge and other abuse conditions due to overcurrent and internal dendrites, resulting in internal heat accumulation. When the heat accumulates to a certain extent, it will cause the electrolyte, positive electrode and other internal materials to have an exothermic chain reaction, eventually leading to thermal runaway of the lithium battery. [0003] At present, the way to solve the safety problem of lithium...

AI Technical Summary

Problems solved by technology

However, due to the limitations of various factors, the above methods cannot fundamentally solve the safety problem of lithium-ion batteries.