Polyimide binder precursor composition, and power storage device using same

A polyimide binder precursor composition for a power storage device electrode, comprising a reaction product of a tetracarboxylic acid component and a diamine component, and a solvent,

• wherein a polyimide binder obtained from the polyimide binder precursor composition has an irreversible capacity of 1200 mAh/g or less, wherein
• the tetracarboxylic acid component comprises more than 80 mol % of an alicyclic tetracarboxylic dianhydride based on the total amount of the tetracarboxylic acid component, wherein the alicyclic tetracarboxylic dianhydride is selected from the group consisting of:
• wherein R31 is a direct bond or a divalent organic group, and R41, R46 and R47 are each independently selected from the group consisting of —CH2—, —CH═CH—, —CH2CH2—, —O— and —S—;
• and
• the diamine component comprises, based on the total amount of the diamine component,
• more than 80 mol % of an aromatic diamine compound, wherein the aromatic diamine compound is selected from compounds represented by formula:
• wherein W1 is a divalent group selected from the group consisting of:
• and a divalent group selected from formula (6):
• wherein R61 to R68 each independently represents any one of the divalent groups selected from the group consisting of:
• n12 and n13 each independently represent an integer of 0 to 4;
• and
• R52 and R53 are each independently an alkyl group having 1 to 6 carbon atoms, a halogen group, a hydroxyl group, a carboxyl group, or a trifluoromethyl group.