METHOD FOR PRODUCING SEPARATOR, METHOD FOR MANUFACTURING MOLTEN SALT BATTERY, SEPARATOR, AND MOLTEN SALT BATTERY

摘要

Provided are a method for producing a separator that is usable in a molten salt battery and is not easily broken, a method for producing a molten salt battery, a separator, and a molten salt battery having this separator. A separator 3 of a molten salt battery is made of a porous resin sheet. The separator 3 is improved in wettability to a molten salt by giving hydrophilicity to the resin sheet. In the case of a fluororesin sheet, the sheet is impregnated with water, and irradiated with ultraviolet rays so that C-F bonds in the fluororesin are cleaved and the resultant reacts with water to generate hydrophilic groups, such as OH groups, in each surface layer thereof. The separator gains hydrophilicity through the hydrophilic groups. The separator 3 made of the resin is not easily broken so that the separator 3 can be made into a bag form. In a molten salt battery having the bag-form separator 3, the growth of a dendrite is prevented so that the battery can be improved in charge/discharge cycle characteristic.