碳化钛类MXene基材料在锂硫电池中的应用研究进展

Research progress in the application of MXene-based materials in lithium-sulfur batteries

作为储能器件的重要一员,锂硫电池具有理论能量密度高、安全性好、成本低等优点,已成为目前最具前景的电源体系之一.但锂硫电池充放电过程中多硫化物的穿梭效应使其在长期循环过程中的性能衰减.MXene基材料具有优异的导电性和高比表面积,对多硫化锂具有强化学吸附和催化转化能力,能够有效避免多硫化物的穿梭效应,从而提高锂硫电池的循环稳定性和倍率性能.本工作简述了MXene基材料在锂硫电池中的应用优势,总结了MXene基复合材料在锂硫电池正极和隔膜中的应用研究现状,归纳了MXene基材料对锂硫电池穿梭效应的影响,最后,展望了MXene基材料在锂硫电池领域的未来研究方向.

Lithium-sulfur(Li-S)batteries have been considered as one of the most promis-ing systems for next-generation high-energy rechargeable Li batteries owing to their high theoretical energy density,safe operation,cost effectiveness,and environmental friendliness.However,the shuttle effect of polysulfide in the charge-discharge process of Li-S battery degrades its performance in a long-term cycle.MXene-based materials possess excellent electrical conductivity and high specific surface area,which can effectively avoid the shut-tle effect of polysulfide owing to their enhanced chemical adsorption capacity and catalytic conversion ability,thereby improving the cycle stability and magnification performance of Li-S batteries.This paper briefly describes the advantages of using MXene-based mate-rials in Li-S batteries,summarises the application status of MXene-based composites in the positive electrodes and separators of Li-S batteries,and the influence of MXene-based materials on the shuttle effect of Li-S batteries.Finally,the future research direction of MXene-based materials in the field of Li-S batteries is prospected.