Patent ID: 8338028

Claim:
A power storage device comprising a positive electrode, a negative electrode, and an electrolyte, wherein: at least one of the positive electrode and the negative electrode includes an electrode active material comprising a ketone compound that includes a ring structure in a molecule, the ring structure being a five-membered or seven-membered ring composed of atoms at least three adjacent ones of which are each bonded to a ketone group, the ketone compound is selected from the group consisting of a ketone compound having a structure represented by the following general formula (2) and a ketone compound having a structure represented by the following general formula (3): where R 1 and R 2 are each independently a hydrogen atom, a fluorine atom, or an unsaturated or saturated aliphatic group, the unsaturated or saturated aliphatic group may contain a halogen atom, a nitrogen atom, an oxygen atom, a sulfur atom, or a silicon atom, R 1 and R 2 may be bonded to each other to form a ring, the ring formed by the bonding of R 1 and R 2 may include a substituent selected from the group consisting of a fluorine atom, a cyano group, a C1 to C4 arkyl group, a C2 to C4 alkenyl group, a C3 to C6 cycloalkyl group, a C3 to C6 cycloalkenyl group, an aryl group, and an aralkyl group, and the substituent may contain at least one atom selected from the group consisting of a fluorine atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a silicon atom, and where R 7 to R 10 are each independently a hydrogen atom, a fluorine atom, a cyano group, a C1 to C4 arkyl group, a C2 to C4 alkenyl group, a C2 to C4 alkynyl group, a C3 to C6 cycloalkyl group, a C3 to C6 cycloalkenyl group, an aryl group, or an aralkyl group, and the respective groups represented by R 7 to R 10 may contain at least one atom selected from the group consisting of a fluorine atom, a nitrogen atom, an oxygen atom, a sulfur atom, and a silicon atom.