| 摘要 |
PURPOSE:To improve a charging characteristic and a service life characteristic by using a separator formed by adding polyvinyl alcohol and a surface active agent to a polyorefine porous body treated by fuming sulfuric acid or concentrated sulfuric acid. CONSTITUTION:A polyorefine porous body is treated by fuming sulfuric acid or concentrated sulfuric acid, and an electrolytephilic property is improved. Polyvinyl alcohol and a surface active agent are added to this porous body, and a separator is formed. Thereby, gas permeability and an electrolyte holding property become excellent, and the utilization factor of an active material is improved, and the separator excellent in a charging characteristic and a service life characteristic can be obtained. |
