Novel starfish‐like Mo2C framework as efficient sulfur host for high electrochemical performance lithium–sulfur batteries

Abstract

AbstractBACKGROUNDLithium–sulfur (Li–S) batteries are one of the most suitable energy storage devices for electronic requirements due to their high energy density and specific capacity. In the past decades, many researchers have devoted themselves to developing high performance Li–S batteries. However, the application of LiS batteries continues to be hindered because of the severe polysulfide migration upon electrochemical cycles. In this work, novel starfish‐like Molybdenum carbide (Mo2C) framework was prepared and used as cathode host materials for sulfur. Due to the presence of the Mo2C framework, the polysulfide migration can be efficiently inhibited.RESULTSThe as‐prepared Mo2C/S composites exhibited a high initial specific capacity of 1396 mAh g−1 at the current density of 0.1 C. Moreover, the Mo2C/S composites displayed a high capacity of 936 mAh g−1 at 1 C after 300 cycles.CONCLUSIONThe LiS batteries demonstrate superior cycling stability and high specific capacity via using Mo2C/S composites cathode. © 2020 Society of Chemical Industry (SCI)