Importance

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Abstract

Disclosed herein is an energy storage device. The energy storage device according to an exemplary embodiment of the present invention includes a case providing an internal space with a first space and a second space; an electrolyte solution filled in the internal space of the case; a positive electrode structure disposed on an interface between the first space and the second space and having a cathode active material layer including metal oxide composite; a first negative electrode disposed in the first space and having a first anode active material layer including graphite; and a second negative electrode disposed in the second space and having a second anode active material layer including activated carbon.

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First Claim