Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Chem Asian J. 2012 May;7(5):1013-7. doi: 10.1002/asia.201100796. Epub 2012 Feb 28.
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.
最受欢迎的提高锂硫 (Li-S) 电池中硫电极的循环稳定性和倍率性能的策略是通过复杂的化学/物理处理将硫限制在导电介质中。硫化锂 (Li(2)S) 已被提议作为硫的替代电极材料。然而，为了将其应用，它必须克服在空气中的高不稳定性以及含硫电极的所有缺点。在此，我们报告了使用通过在低电压下将商业二硫化钼 (MoS(2)) 电化学转化为 Li(2)S 和金属钼而获得的 Li(2)S 的可行性，Li(2)S 作为 Li-S 电池中高性能的活性材料。金属钼阻止了多硫化锂溶解在电解液中，并提高了硫化物电极的导电性。因此，原位电化学制备的 Li(2)S/Mo 复合材料表现出高的循环稳定性和高的硫利用率。
