Synthesis and Electrochemical Research of the Properties of Mixed Nickel-Cobalt Oxides as Materials for Energy Storage Devices

Mixed nickel-cobalt oxide was prepared by hydrothermal synthesis. The morphology and structure of the produced oxide were studied using scanning electron microscopy and X-ray structural analysis: spinel NiCo2O4 forms spherical nanostructures. Electrodes were prepared from composite materials based on nickel-cobalt mixed oxides, polyvinylidene fluoride binder, and carbon black, applied to nickel foam by various methods. Electrochemical studies of electrodes in aqueous alkaline solutions have been carried out by the cyclic voltammetry. The obtained values of the specific capacity of the material in charge-discharge cycling reach 840 F g–1 at 5 mV s–1. The best value of the capacity retention of the produced materials is 87% for 100 cycles.