| 摘要 |
PURPOSE:To prevent internal shortcircuiting of a Li secondary battery effectively by forming a separator from a lamination of porous high-density film with resistance against electrolyte and unwoven cloth, and by arranging unwoven cloths on both sides of the film. CONSTITUTION:Unwoven cloths 5 are arranged on both sides of a film 4, wherein the unwoven cloth 5 is of glass fiber etc., having a thickness of 60-200mum, a density of 0.3-0.45g/cm<3>, while the film is of polyethylene etc., having a thickness of 25-100mum and a density of 0.5-0.6g/cm<3>. The negative pole is made of metal Li etc., while the positive pole is of an electroconductive polymer such as polyacetylene, and the solution used shall for ex. be LiClO4, and the solvent 1,2-dimethoxyethane, whereto triethyl amin etc., is added as a stabilizer. According to this arrangement, eventual production of Li dendrite on the negative pole 1 will not necessarily lead directly to internal shortcircuiting, that should prolong the cycle life of a Li secondary battery. |
