One‐Pot Synthesis of CuCo2S4 Sub‐Microspheres for High‐Performance Lithium‐/Sodium‐Ion Batteries

Abstract Ternary transition metal sulfides have come into notice as a new class of prospective material with multiple applications in energy storage. In this work, CuCo 2 S 4 sub‐microspheres with sizes of 0.3–0.5 μm were prepared by a facile one‐pot solvothermal method. This method combines chemical co‐precipitation and sulfidation processes into one pot to make it low‐cost and time‐saving by controlling the volume ratio of mixed solvent. The as‐prepared CuCo 2 S 4 sub‐microsphere exhibits an outstanding energy storage performance as dual anodes for lithium/sodium‐ion batteries. It possesses a high specific capacity of 1081.3 mA h g −1 at 100 mA g −1 after 100 cycles with pseudocapacitive properties in lithium‐ion batteries and 522.4 mA h g −1 at 200 mA g −1 after 140 cycles in sodium‐ion batteries. The superior electrochemical performances of CuCo 2 S 4 sub‐microspheres forecast they will be a kind of competitive anode materials for lithium/sodium‐ion batteries.