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Mechanism of Lithium Storage in MoS 2 and the Feasibility of Using Li 2 S/Mo Nanocomposites as Cathode Materials for Lithium–Sulfur Batteries
Author(s) -
Fang Xiangpeng,
Guo Xianwei,
Mao Ya,
Hua Chunxiu,
Shen Lanyao,
Hu Yongsheng,
Wang Zhaoxiang,
Wu Feng,
Chen Liquan
Publication year - 2012
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201100796
Subject(s) - sulfur , sulfide , electrolyte , materials science , lithium (medication) , electrode , molybdenum disulfide , electrochemistry , cathode , inorganic chemistry , dissolution , polysulfide , nanocomposite , molybdenum , chemical engineering , chemistry , nanotechnology , metallurgy , medicine , engineering , endocrinology
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.