A lithium sulfur battery, a separator thereof, and a preparation method of the separator

Abstract

The invention discloses a lithium sulfur battery, a separator thereof and a preparation method of the separator, and belongs to the technical field of a lithium ion battery separator. A functional film for a lithium sulfide battery comprising a porous membrane substrate, the surface of the porous membrane substrate is provided with a functional structure layer, wherein the components of the functional structure layer comprise a filler, an adhesive and a lithium ion conductive functional assistant, wherein the filler is one or more than one of layered materials such as MoS2, graphene, iron sulfide, TiS2, ZrS2 and the like, and the addition amount thereof is 15%-80% of the total weight of the functional structure layer.. A lithium sulfur battery of the present invention uses the functional membrane as a separator. The technical proposal of the invention can effectively suppress the shuttle effect of lithium polysulfide and improve the coulomb efficiency, capacity and conductivity of thelithium sulfide battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery separators, and more specifically relates to a lithium-sulfur battery, a separator and a preparation method of the separator. Background technique [0002] In recent years, more and more new energy vehicles have appeared in people's daily life, and the state has also vigorously supported and promoted the marketization and application of new energy electric vehicles. Lithium-sulfur batteries use earth-rich and high-capacity sulfur as the positive electrode, and lithium as the negative electrode. During discharge, the negative electrode reacts as lithium loses electrons and becomes lithium ions, and the positive electrode reacts as sulfur reacts with lithium ions and electrons to form sulfide. The reaction equation It is: S8+16Li++16e-1=8Li2S. Due to the occurrence of multiple electron transfer reactions, lithium-sulfur batteries have a high theoretical specific capacity, and their theo...

AI Technical Summary

Problems solved by technology

The above two applications can suppress the "shuttle effect" of lithium polysulfide to a certain extent through the setting of functional sulfur-resistant coatings, but the effect still needs to be further improved

In addition, since the existing separator is usually prepared by the phase inversion method, its mechanical strength is low and the battery rate performance is poor.

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