Cu2S@ N, S Dual-Doped Carbon Matrix Hybrid as Superior Anode Materials for Lithium/Sodium ion Batteries

Cu2S is considered as a promising electrode material for lithium-ion and sodium-ion batteries owing to its flat charge-discharge plateau as well as the abundant reserves. However, serious capacity fading and formation of polysulfides during electrochemical process restrict its practical application. In this work, a new type of Cu2S@N, S dual-doped carbon matrix (Cu2S@NSCm) hybrid is synthesized through a simple in-situ polymerization process and subsequent carbonization process. Due to the N, S dual-doped carbon matrix, which can buffer the volume change, restrain the dissolution of polysulfide and enhance the electron conductivity during electrochemical process, the hybrid demonstrates excellent electrochemical performance. The Cu2S@NSCm hybrid exhibits a reversible capacity of 560.1 mAhg(-1) at a current density of 1000mAg(-1) after 550 cycles when used in lithium-ion batteries, which is among the best performance for Cu2S based anode materials. Moreover, a capacity of 182.3mAhg(-1) is obtained after 50 cycles when used as an anode material in sodium ion batteries, which is much better than the pure Cu2S.