In3Se4 and S-doped In3Se4 nano/micro-structures as new anode materials for Li-ion batteries

Abstract

In₃Se₄ and S-doped In₃Se₄ nano/micro-structures consisting of thin nanosheets have been developed as new anode materials for Li-ion batteries. Electrochemical performance measurement shows that In₃Se₄ nano/micro-structures deliver high discharge capacity (e.g. 651.0 mA h g⁻¹ obtained in the 30^th cycle at a current density of 50 mA g⁻¹). Through detailed transmission electron microscopy analysis, it has been found that the electrochemical reaction mechanism is the conversion between In₃Se₄ and Li₁₃In₃ + Li_xSe. Moreover, S doping is demonstrated to be an effective approach to further improve the electrochemical performance of In₃Se₄ nano/micro-structures. S-doped In₃Se₄ nano/micro-structures achieve enhanced discharge capacity and cycling stability, with a discharge capacity of 850.6 mA h g⁻¹ in the 30^th cycle. This study demonstrates the potential of In₃Se₄-based nano/micro-structures as anode materials for rechargeable Li-ion batteries.