关键词: 锂锂硫电池, 热失控, 穿梭效应, 内部短路, 隔膜改性

Abstract: Lithium–sulfur (Li–S) batteries have attracted more and more attention lately because they have very high theoretical specific energy (2500 W?h/kg), five times higher than that of the commercial LiCoO2/graphite batteries. As a result, they are strong contenders for next-generation energy storage in the areas of portable electronics, electric vehicles, and storage systems for renewable energy such as wind power and solar energy. However, poor cycling life, low capacity retention and poor safety are main factors limiting their commercialization. The non-uniform surface of lithium metal tends to form the dendrites during the cycle, causing a short circuit inside and making the battery ignite and burn. Besides, the energy density of lithium?sulfur batteries is about 3~5 times higher. The internal overheating of the battery causes thermal runaway, which can cause fire and explosion. Nevertheless, the use of a functional separator can curb the occurrence of internal short-circuit and thermal runaway of the battery, and improve the safety performance of the lithium?sulfur battery. Meanwhile, the shuttle effect in the cycle can also be weakened to some extent. This article reviews the latest developments and future trends in the functional modification of separators for functional lithium?sulfur batteries.

Key words: lithium sulfur battery, thermal runaway, shuttle effect, internal short circuit, separator modification