Ternary tin selenium sulfide (SnSe0.5S0.5) nano alloy as the high-performance anode for lithium-ion and sodium-ion batteries

Abstract

Metal sulfides have received tremendous attention due to their superior electrochemical performance. In this study, it is the first time that the ternary tin selenium sulfide, SnSe0.5S0.5, is investigated as a potential high-performance anode material for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). The SnSe0.5S0.5/C nanocomposites have also been synthesized through a facile polyol-method followed by a simple hydrothermal process and subsequent sintering. The material demonstrated a high specific capacity and a long-term cycling stability in both Li-ion and Na-ion batteries (625mAhg−1 for LIB at 500mAg−1 rate after 1000 cycles, 430mAhg−1 in a SIB at 200mAg−1 rate after 100 cycles). Furthermore, the kinetic analysis of Li-ions and Na-ions storage revealed that the extrinsic pseudocapacitive contribution could improve the charge transfer rate during the insertion and extraction of Li-ion and Na-ion, thus enhancing the rate performance and cycling stability. These results demonstrated that the novel tin selenium sulfide (SnSe0.5S0.5) material could potentially be an excellent anode material for Li-ion storage and Na-ion storage.