| abstract |
PROBLEM TO BE SOLVED: To use a polymer having high stability and high reactivity as an electrode active material in an acidic atmosphere, to have both high electromotive force and high cycle characteristics, and to enable rapid charge and discharge. A secondary battery and a capacitor are provided. SOLUTION: A secondary battery and a capacitor using an indole polymer having a structural unit represented by the general formula (1) as an electrode active material and using protons as charge carriers of the polymer. Embedded image In the formula, R is a hydrogen atom, a halogen atom, a hydroxyl group, It represents a carboxyl group, a sulfone group, a sulfate group, a nitro group, a cyano group, an alkyl group, an aryl group, an alkoxyl group, an amino group, an alkylthio group, an arylthio group, and the like, and at least one R has a substituent other than a hydrogen atom. |