Manganese compounds have many important functions and applications, mainly including the following aspects: Catalysts: Manganese compounds are often used in catalytic reactions, such as in organic synthesis and environmental chemistry. They can promote the progress of certain chemical reactions and improve the efficiency of the reactions. Oxidants: Manganese dioxide (such as MnO₂) is a common oxidant and is widely used in chemical synthesis and industrial processes, such as in batteries and water treatment processes. Pigments: Certain manganese compounds (such as manganese oxides) can be used as pigments and are used in fields such as ceramics, glass and coatings to provide color and beauty. Batteries: Manganese compounds are used as electrode materials in lithium batteries and nickel-manganese batteries to increase the energy density and cycle life of the batteries.