Active materials for the positive electrode in alkaline storage batteries

摘要

Active materials for positive electrodes in alkaline storage batteries excellent in capacity density, discharge voltage, and high rate discharge characteristics can be provided by coating the surface of the active material powder with an alpha -like Al-substituted Ni(OH)2. Moreover, active materials excellent in capacity density, discharge voltage and high rate discharge characteristics, and besides in high-temperature charging efficiency and/or charge and discharge characteristics can be provided by dissolving in solid state and/or coprecipitated state at least one different metal element selected from Ca, Cr, Y, Ti and Co in the alpha -like Al-substituted Ni(OH)2 layer. Furthermore, active materials excellent in capacity density, discharge voltage and high rate discharge characteristics, and besides in charge and discharge characteristics can be provided by coating with a Co oxide the surface of the active material powder coated with the alpha -like Al-substituted Ni(OH)2.