Bimetallic CuSbSe2: 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 mechanisms. In this work, we report the synthesis and electrochemical properties of a novel bimetallic TMCs material CuSbSe2. 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 XRD and HRTEM reveal a combined conversion-alloying reaction mechanism of LIBs and NIBs. Our findings suggest bimetallic CuSbSe2 anode could be a potential anode material for both SIBs and LIBs.