锂硫电池二氧化钛纳米线复合隔膜的制备及其电化学性能

Preparation of Titanium Dioxide Nanowire Composite Membrane for Lithium-sulfur Battery and Study on Its Electrochemical Performance

锂硫电池具有能量密度高,对环境友好等优点,受到了人们的广泛关注。但锂硫电池现存的问题,特别是"穿梭效应"的存在会造成电池容量的快速衰减。针对其"穿梭效应",用纳米线形态的二氧化钛制备了复合隔膜SCTNW,并探究该复合隔膜对锂硫电池性能的影响。电化学测试表明SCTNW可以减小电池的极化,抑制"穿梭效应",有效的提高电池的倍率性能和长循环性能且当SCTNW厚度为200μm时,锂硫电池具有最好的长循环性能。

Lithium-sulfur(Li-S)battery has the advantages of high energy density,environmental friendliness and so on.Li-S has attracted much attention.However,the existing problems of Li-S battery,especially the'shuttle effect'will cause the rapid decline of battery capacity.For the 'shuttle effect',in this paper with nanowire form of titanium dioxide prepared composite membrane SCTNW,and explore the performance of composite membrane for lithium Sulfur battery.Electrochemical tests show that SCTNW can reduce the polarization of the battery,inhibit the ' shuttle effect',effectively improve the battery magnification performance and long cycle performance and when the SCTNW thickness of 200μm,the lithium-sulfur battery has the best long cycle performance.