Lithium-ion secondary battery comprising a binder

A lithium-ion secondary battery with good cyclability by suppressing the active material from coming off or falling down from the current collector. [0002] It is characterized in that the lithium-ion secondary battery comprises a binder comprising a cured substance of alkoxy group-containing silane-modified polyamic acid resin which has a structure being specified in the application as Chemical Formula 2 wherein R1 is 3,3',4,4'- biphenyltetracarboxylic dianhydride residue and R2 is 4,4'-diaminodiphenyl ether residue.