2001 Volume 69 Issue 11 Pages 858-862
In order to improve the active material utilization of non-sintered type Ni(OH)2 positive electrode for alkaline storage batteries, we studied the effect of an oxidation treatment of β-Co(OH)2 by using air of various temperatures and NaOH aqueous solution spray on the conductivity, and examined its application to surface modification of Ni(OH)2 particles. Cobalt oxide after the oxidation treatment over 60°C showed higher specific conductivity than β-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 modification of β-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 the single electrode method.
