Patent ID: 8603677
Filing Date: 2013-12-10
Classification: H01M,Y02E

Abstract:
1. A method for producing a coated nickel hydroxide powder as a cathode active material for alkaline secondary battery, the method comprising the steps of: dispersing a nickel hydroxide powder in water to prepare a suspension; and supplying an aqueous alkali solution to the suspension with stirring to keep a pH of the suspension at 8 or higher as measured at 25° C. and supplying an aqueous cobalt salt solution to the suspension to coat a surface of each of particles of the nickel hydroxide powder with cobalt hydroxide crystallized out by neutralization, wherein a ratio of a supply rate ρ (mol/sec) of a cobalt salt contained in the aqueous cobalt salt solution to a product of a supply width d (cm) of the aqueous cobalt salt solution measured in a direction orthogonal to a direction of a flow of the suspension and a flow velocity v (cm/sec) of the suspension in a contact portion between a liquid surface of the suspension and the aqueous cobalt salt solution as a supply position of the aqueous cobalt salt solution, that is, ρ/(d×v) is 3.5×10