| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple, economical method for manufacturing a battery separator element showing a high ionic conductivity and circulation stability under a long period of storage and usage of the battery. SOLUTION: A manufacturing method of a meso porous polymer film employed as an ionic conductive interelectrode separator for a battery cell, comprising the steps of: (a) preparing a polymer material, a volatile fluid solvent for the polymer material, and a compound containing a second fluid with the volatility lower than that of the solvent, the compound being able to be mixed with the solvent and be coated; (b) casting the compound so that layers are formed; (c) volatilizing the fluid from the layers under the condition that the solvent volatilizes actually faster than the above non-solvent; (d) keeping the solvent volatilized up to the completion of the gellation of the above polymer material parent; and (e) continuing the volatilization of the above non-solvent from the above droplet until the process is complete, so that meso porous voids are equally dispersed among the above film parent. |
