| 摘要 |
PURPOSE:To increase charge-discharge energy efficiency of a battery and mechanical strength of a separator by using a composite film of a hydrophilic film and a porous film as a separator. CONSTITUTION:A polymer whose moisture content is 10-200% is used as a hydrophilic film. A cellulose polymer or an ethylene-vinyl alcohol copolymer is used. As a porous film, a material having good ion permeability, high mechanical strength and acid resistance, such as porous Teflon film and porous vinyl chlorid film, is used. A composite film is formed by press-bonding or lamination of the hydrophilic film and the porous film. By this construction, electric resistance in a battery is substantially reduced and charge-discharge energy density is improved. |
