PURPOSE: To obtain an uniform and thin layer positive electrode mix sheet by adding and mixing a conductive assistant and a fluorine resin binder to vanadium oxide of a positive electrode active material, and adding an organic solvent containing a specified amount of ethyl acetate thereto followed by kneading and rolling.
CONSTITUTION: Vanadium oxide powder is used as a positive electrode active material, and acetylene black as a conductive assistant and ethylene tetrafluoride as a binder are mixed thereto. An organic solvent is added thereto followed by kneading, and the resulting mixture is rolled by a roll to form a thin layer positive electrode mix sheet. As the added organic solvent, those containing ethyl acetate in a volume percentage of 20% or more are used. Hence, the fluorine resin is cut by the swelling at the time of kneading, and further kneaded into a fibrous state, resulting in an increase in viscosity and sheet workability. Consequently, an uniform and thin layer positive electrode mix sheet can easily and stably be manufactured.
MASUDA YOSHITOMO
WADA HIROAKI
MIYAZAKI TADAAKI
KAWAGOE TAKAHIRO
