MANGANESE-CONTAINING COMPOSITE NICKEL HYDROXIDE ACTIVE MATERIAL AND MANUFACTURE THEREOF

摘要

PROBLEM TO BE SOLVED: To improve a discharging characteristic and especially availability by providing a coating layer formed of an oxide containing Ni and Co for a material used as the electrode material for a battery. SOLUTION: Mn-containing composite nickel hydroxide grain is coated by a Ni oxide layer and a Co oxide layer or a Ni-Co composite oxide layer. In the oxide coating layer part, the content of metal (Ni oxide and Co oxide) to hydroxide grain preferably lies in the range of 2-10 wt.%. The Mn containing composite Ni hydroxide is prepared in the following manner. After Mn- containing composite nickel hydroxide gas been dispersed in an aqueous solution containing Ni and Co salt, an alkaline aqueous solution and aqueous solution containing ammonium ion are fed continuously to this aqueous solution, a composite oxide of Ni and CO is deposited on the surface of the dispersed grains and to cover have then covered by a composite layer consisting of the Ni oxide layer and the Co oxide layer.