Mechanism of Lithium Storage in MoS 2 and the Feasibility of Using Li 2 S/Mo Nanocomposites as Cathode Materials for Lithium–Sulfur Batteries

作者：Xiangpeng Fang, Xianwei Guo, Ya Mao, Chunxiu Hua, Lanyao Shen, Yong‐Sheng Hu, Zhaoxiang Wang, Feng Wu, Liquan Chen · 发表于：Chemistry - An Asian Journal · 年份：2012 · DOI：10.1002/asia.201100796 · 被引用次数：167 · 研究领域：Advanced Battery Materials and Technologies、Advancements in Battery Materials、Advanced Battery Technologies Research

The most-popular strategy to improve the cycling stability and rate performance of the sulfur electrode in lithium-sulfur (Li-S) batteries is to astrict the sulfur in a conducting medium by using complicated chemical/physical processing. Lithium sulfide (Li(2)S) has been proposed as an alternative electrode material to sulfur. However, for its application, it must meet challenges such as high instability in air together with all of the drawbacks of a sulfur-containing electrode. Herein, we report the feasibility of using Li(2)S, which was obtained by electrochemical conversion of commercial molybdenum disulfide (MoS(2)) into Li(2)S and metallic molybdenium (Mo) at low voltages, as a high-performance active material in Li-S batteries. Metallic Mo prevented the dissolution of lithium polysulfides into the electrolyte and enhanced the conductivity of the sulfide electrode. Therefore, the in situ electrochemically prepared Li(2)S/Mo composite exhibited both high cycling stability and high sulfur utilization.