| 摘要 |
PURPOSE:To increase the storage performance and discharge performance of a battery by placing an oxygen selectively permeable composite film having a specified structure between the air intake side of a gas diffusion electrode and the inner surface of a battery container. CONSTITUTION:An oxygen selectively permeable compsite film 11 is placed between a gas diffusion electrode 1 using oxygen as the active material and a battery container 8 having an air intake hole 3. The composite film 11 is preapred by laminating water repellent microporous films on both sides of a hygroscopic microporous film. For example, polytetrafluoroethylene microporous films are laminated on both sides of a 125mum thick cellulose ester film having an average pore size of 0.05mum. Air in the atmosphere is selectively taken into a battery at a sufficient rate and the penetration of water vapor and carbon dioxide is prevented for a long time. |
