Transition metal sulfide/hydroxide electrode materials with high specific capacities

Abstract

Nowadays, research on energy storage devices is mainly focused on enhancing their electrochemical performance. Among them, electrode materials play an important role. In this work, we synthesised several hybrid NiCo₂S₄@Ni(OH)₂ samples by a three-step hydrothermal route. As electrode materials, the obtained flower-like structures can accelerate the transfer of electrolyte ions. They possess a specific capacity of 2899.48 F g⁻¹ at 1 A g⁻¹ and superior cycle stability. Moreover, the assembled hybrid device obtains an energy density of 59.26 W h kg⁻¹ at 1432.07 W kg⁻¹. Bending tests at different angles indicate that the device possesses excellent mechanical flexibility.