Surface modification of Ni(OH)(2) positive electrode with highly oxidized co oxide for alkaline secondary batteries

In order to improve the active material utilization of non-sintered type Ni (OH)(2) positive electrode for alkaline storage batteries, we studied the e ffect of an oxidation treatment of P-Co(OH)(2) by using air of various temp eratures and NaOH aqueous solution spray on the conductivity, and examined its application to surface modification of Ni(OH)(2) particles. Cobalt oxid e after the oxidation treatment over 60 degreesC showed higher specific con ductivity than beta -CoOOH. The chemical composition and formation process of the cobalt oxide were investigated with X-ray diffraction (XRD), atomic absorption spectrometry, iodometry and a transmission electron microscope ( TEM), and the origin of the high conductivity was clarified. Surface modifi cation of P-Ni(OH)(2) particle with the cobalt oxide was examined and then the effect on the active material utilization was evaluated by the aid of t he single electrode method.