多硫化物阻隔层在锂硫电池中的应用研究进展

摘要

锂硫电池具有远高于锂离子电池的理论放电比容量(1 675 mAh/g)和能量密度(2 600 Wh/kg),被认为是很具应用潜力的电池体系,因此被广泛的研究和关注.然而硫的导电性能差、利用率低以及多硫化物的穿梭效应等问题使得锂硫电池的循环性能不稳定.为了克服穿梭效应的影响,近年来发展了多种新型的多硫化物阻隔层设计和制备方法来提高电池循环稳定性,本文分别从碳质材料阻隔层、金属氧化物阻隔层以及导电聚合物阻隔层三方面综述了最新的研究进展,并指出免集流体正极材料、阻隔层以及隔膜实现一体化设计将成为锂硫电池研究的发展方向.%Li-S batteries have attracted great attention for their high theoretical specific capacity (1 675 mAh·g-1) and energy density (2 600 Wh·Kg-1).However, their low conductivity and poor utilization efficiency of sulfur greatly restrict practical applications.Novel polysulfide barriers have been designed and fabricated to overcome the shuttle effect and to improve cycle stability.In this review, the recent development of polysulfide barrier materials for Li-S batteries is introduced, which include carbon materials, metal oxides and conducting polymers.The development of an integrated electrode consisting of a polysulfide barrier and separator could be a hot research topic for Li-S batteries.