A lithium secondary battery isolating film and lithium secondary battery using the same

Abstract

The invention relates to a lithium secondary cell isolation film, at least including a strong water absorption material-high molecular composite layer, where the preferred strong water absorption material is molecular sieve. The strong water absorption material can completely absorb the residual and infiltration water in manufacturing process of the lithium secondary cell so as to prevent the poisoning of the lithium secondary cell or the reaction of lithium metal with the water, thus prolonging the service life. In addition, the proper combination of the strong water absorption material with the high-molecular composite can increase the mechanical strength of the isolation film and reduce the electrode penetration and thus it improves the safety of the lithium secondary cell. The invention also relates to a lithium secondary cell using this isolation film.

Description

【Technical field】 [0001] The invention relates to a lithium secondary battery, in particular to a lithium secondary battery separator and a lithium secondary battery using the separator. 【Background technique】 [0002] Lithium secondary batteries have been widely used in consumer electronic products such as mobile phones and notebook computers due to their excellent characteristics such as high energy density, high electromotive force and low self-discharge. [0003] The lithium secondary battery includes lithium metal secondary battery, lithium ion battery and polymer lithium battery. Lithium metal secondary batteries use metal lithium or lithium alloys or lithium-containing compounds as negative electrode materials, and transition metal compounds (such as V 6 o 13 ,MoS 2 , V 2 o 5 ,TiO 2 , MnO 2 ) as the positive electrode active material, anhydrous organic solvent as the electrolyte, and the general term for a type of battery in which the battery reaction can be re...

AI Technical Summary

Problems solved by technology

However, controlling the relative humidity in the air to be less than 0.04% requires high cost, and it is still unavoidable to avoid a certain amount of water molecules remaining in the preparation process

In addition, after long-term use of lithium secondary batteries, water molecular gas penetration cannot be avoided, resulting in loss of battery function or battery safety issues.

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