| 摘要 |
PURPOSE:To obtain a separator having the large liquid absorption height and no anger of battery performance drop due to the melting of a binder by wet-mixing a fiber mainly composed of an alkaline complex silicate glass fiber and powder mainly composed of silica powder. CONSTITUTION:A fiber mainly composed of an alkaline complex silicate glass fiber having the average diameter of 0.5-1.0mum and powder mainly composed of silica powder having a relative surface area of not less than 100m<2>/g are wet- mixed while interposing powder grains mainly composed of silica in the gaps of glass fibers for making the hole diameter minute and binding fibers each other or fibers and powder grains each other mainly with a water glass-shaped substance generated mainly when mixing. The amount of powder is made to be 1- 40wt% of the separator weight. Thereby, the liquid holding force is improved while causing no coming-off of powder thus simplifying handling. |
