| 摘要 |
PURPOSE:To prevent the CO2 gas and water vapor in the atmosphere from intruding into a battery for a long period of time by interposing a complex film, which is formed from a film of polyvinylfenol-polydimethylsiloxane block copolymer and a fine porosity film, between the air intake side of a gas diffusion electrode and the inner surface of a battery jar. CONSTITUTION:A battery is equipped with a gas diffusion electrode 1 using oxygen as active substance and a battery jar having an air intake hole 3 leading to the outside air, and an oxygen selective permeative complex film 11 formed from a film 2 of polyvinylfenol-polydimethylsiloxane block copolymer and a fine porosity film 4 supporting it is interposed between the inner surface of the batter jar and the air intake side of the gas diffusion electrode 1. This film is polyvinylfenol-polydimethylsiloxane block copolymer is non-porous, homogeneous, and having oxygen selective permeability, and is suitably of 1.0mum thick or less in order to provide sufficient oxygen permeating speed and the permeation hindering ability for water vapor and CO2 gas. This permits provision of excellent performance in practical application, fine anti-leak property, and a long-time storing characteristic. |
