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 SnGeS 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. SnGeS complex phases in an amorphous state can contribute to the high capacity of Sn:GeS (6:4 m/m), possibly suppressing the agglomeration and pulverization of Sn.