| 摘要 |
PURPOSE:To increase life without decreasing battery performance by covering the surface of a plate with a solid layer comprising acid resistant and electrochemically inactive oxide powder, water absorbable high polymer fibers, and a binder. CONSTITUTION:2-5g of polyacrylonitrile fibers having a length of 10mm. are mixed to a mixed solution of acid resistant and electrochemically inactive powder such as alumina, and monobasic aluminum phosphate as a binder. This mixture is spreaded on the surface of a positive plate that formation is not yet applied, and dried to form a solid layer. Thereby, a plate for a lead-acid battery is prepared. Since water absorbing ability of fibers excels in a neutral or alkaline solution than in acidic solution, absorbed water is released and large pores are formed in the solid layer. Thereby, dilute sulfuric acid is easy to diffuse and coming off of the active material caused by forming fine particles is suppressed, and life is remarkably increased. |
