| 摘要 |
PURPOSE:To improve corrosion resistance of a positive electrode collector for improving a high temperature retention property by using a porous body of a stainless steel sheet of a ferrite system containing Cr, Mo, Ti and Nb while having a specified carbon quantity for a sheet-shaped thin positive electrode plate. CONSTITUTION:Graphite powder of 10wt% is added to heat-treated MnO2 powder as a conductive agent while adding polytetrafluoroethylene of 5wt% as a binding agent further adding water to be kneaded. Then, said black mixture is made into a sheet by a rolling roller followed by being press-put into a 0.1mm thick lath-processed porous collector containing Cr of 18-20wt%, Mo of 1.8-2.5wt%, (Ti+Nb) of 0.48wt% and C of 0.007wt% to be made into a positive electrode plate 3. Thereby, especially a spot welding part of a lead plate is prevented from grain field corrosion while improving stability in the high temperature retention. |
