二维材料修饰隔膜抑制锂硫电池穿梭效应策略

Two-Dimensional Materials Modified Separator Strategies of Suppressing the Shuttle Effect in Lithium-Sulfur Batteries

锂硫电池具有高理论比容量(1675 mAh/g)和高能量密度(2600 Wh/kg),被认为是极具应用潜力的电池体系,因此被广泛研究和关注。然而硫的导电性差、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理想。为了克服穿梭效应的影响,近年来很多研究工作集中在功能隔膜的设计制备研究方面,通过修饰的隔膜抑制穿梭效应,提高Li-S电池循环稳定性。本文总结了二维(2D)材料修饰隔膜方面的最新研究进展,并对未来的研究方向提出了思考并进行了展望。

Lithium-sulfur batteries have a theoretical discharge specific capacity(1675 mAh/g)and energy density(2600 Wh/kg)that are much higher than those of lithium-ion batteries.Lithium-sulfur batteries are considered as very promising battery systems,thus they have been widely concerned and researched.However,the poor conductivity of sulfur,low utilization,and the shuttle effect of polysulfides make the cycling performance of lithium-sulfur batteries unstable.In order to overcome the impact of the shuttle effect,a variety of new separator designs and preparation methods have been developed in recent years to improve the cycle stability of the battery.This article reviews the latest research progress from the perspective of 2D material modification of the separator,and uses high-quality separators to suppress the shuttle effect,which will better achieve high stability of Li-S batteries.Besides,future developments are prospected.