Ni(OH)2, or nickel(II) hydroxide, is an inorganic compound composed of nickel, oxygen, and hydrogen. It typically appears as a greenish solid and is commonly used in batteries, particularly in nickel-cadmium and nickel-metal hydride batteries, due to its ability to store and release energy efficiently. In addition to its use in batteries, Ni(OH)2 serves as a catalyst in various chemical reactions and is utilized in the production of nickel salts. It can also be found in some pigments and coatings, contributing to its importance in industrial applications.