Bimetallic CuSbSe 2 : A Potential Anode Material for Sodium and Lithium-Ion Batteries with High-Rate Capability and Long-Term Stability.

Bimetallic transition metal chalcogenides (TMCs) materials have emerged as attractive anodes for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) because of the high intrinsic electronic conductivity, rich redox sites and unique reaction mechanism. In this work, we report the synthesis and electrochemical properties of a novel bimetallic TMCs material CuSbSe 2 . The as-prepared anode delivers a high reversible capacity of 545.6  mA h g -1 for SIBs and 592.6  mA h g -1 for LIBs at a current density of 0.2 A g -1 , and an excellent rate capability of 425.9  mA h g -1 at 20 A g -1 for SIBs and 226.0  mA h g -1 at 10 A g -1 for LIBs without any common-used surface modification or carbonaceous compositing. In addition, ex situ X-ray diffraction (XRD) and High-resolution transmission electron microscopy (HRTEM) reveal a combined conversion-alloying reaction mechanism of LIBs and NIBs. Our findings suggest bimetallic CuSbSe 2 could be a potential anode material for both SIBs and LIBs.