▎ 摘　　要

NOVELTY - A storage battery (300) is manufactured by forming a 1st mixture comprising an active material (306, 309), graphene oxide and a solvent; evaporating the solvent in the 1st mixture to form a 2nd mixture comprising the active material and graphene oxide; and reducing the graphene oxide in the 2nd mixture to form a graphene. Reducing the graphene oxide is performed in a reducing solution comprising a reducer and an organic solvent. USE - The method is useful for manufacturing a storage battery used in electronic device (all claimed). ADVANTAGE - Method is provided for forming a storage battery electrode including an active material layer with high density in which the proportion of conductive additive is low and the proportion of the active material is high. The storage battery has a higher capacity per unit volume of an electrode with the use of a storage battery electrode formed by the formation method. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an electronic device comprising the storage battery. DESCRIPTION OF DRAWING(S) - The drawings show external view and cross-sectional view of coin-type storage battery. Coin-type storage battery (300) Positive electrode can (301) Gasket (302) Positive electrode active material layer (306) Negative electrode active material layer (309)