Sn-based Chalcogenide Composite as a High-Capacity Anode Material for Lithium Rechargeable Batteries

Abstract

Sn‐based chalcogenide composites (TCC) were synthesized as high‐capacity anode materials. SnS formed within TCCs is an active center for Li‐intercalation. Electrochemical cycling shows that the Sn–Ge–S matrix suppresses the volume expansion that can arise from alloying between Sn and Li as well as the grain growth associated with the low melting temperature of Sn. Sn–Ge–S complex phases in an amorphous state can contribute to the high capacity of Sn:Ge–S (6:4 m/m), possibly suppressing the agglomeration and pulverization of Sn.