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

Abstract

BACKGROUND: Lithium-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 (Mo 2 C) framework was prepared and used as cathode host materials for sulfur. Due to the presence of the Mo 2 C framework, the polysulfide migration can be efficiently inhibited. RESULTS: The as-prepared Mo 2 C/S composites exhibited a high initial specific capacity of 1396 mAh g −1 at the current density of 0.1 C. Moreover, the Mo 2 C/S composites displayed a high capacity of 936 mAh g −1 at 1 C after 300 cycles. CONCLUSION: The Li S batteries demonstrate superior cycling stability and high specific capacity via using Mo 2 C/S composites cathode.