Study on the in situ sulfidation and electrochemical performance of spherical nickel hydroxide.

In this paper, atmospheric reflux in water is used to directly form a nickel sulfide layer in-situ with excellent conductivity sulfide on the surface of spherical nickel hydroxide particles, significantly improving the conductivity of nickel hydroxide particles. The experimental results show that the spherical Ni(OH) 2 @NiS material synthesized by the in situ sulfurization method. As the cathode active material of nickel-iron batteries exhibits excellent electrochemical performance, especially high-rate discharge and cycle performance, which are better than nickel hydroxide electrodes with cobalt oxide. The atmospheric reflux method in water has a simple process and equipment and has no pollution to the environment. Spherical Ni(OH) 2 @NiS materials synthesized by in situ vulcanization can completely replace nickel hydroxide material with cobalt, and they have great commercial application value and market competitiveness as cathode active materials for alkaline nickel-based batteries. [Display omitted] • A NiS layer is formed on the surface of spherical Ni(OH) 2 by in situ vulcanization. • NiS has the same function as γ-CoOOH, and both have good electrical conductivity. • A spherical Ni(OH) 2 electrode with a NiS layer shows excellent electrochemical performance. • In situ NiS instead of cobalt additives can significantly reduce the cost of nickel electrodes. [ABSTRACT FROM AUTHOR]