| 摘要 |
PURPOSE:To improve conductivity between fellow active material particles and between a electricity collecting body and the particles by adding many conductive assistants to an active material layer. CONSTITUTION:An active material layer, having the main component of nickel hydroxide, is formed on the surface of a positive electrode in a condition where a substrate is nonexisting, and the containing ratio of a conductive assistant is made higher in the active material layer than in an active material paste layer packed in the inside of a substrate. That is, carboxymethylcellulose is added to nickel hydroxide to a mixed powder body composed of the nickel hydroxide and nickel powder, and moreover pure water is added and kneaded to manufacture paste. The paste is packed in a sintered fiber substrate, and then the paste, to which bivalent cobalt oxide as an additive and the nickel powder and PTFE as a conductive assistant are added, is applied to both the sides of the surface of an electrode. This eliminates the isolation of a substrate at the time of winding on a negative electrode, and moreover improves electrode performance. |
