Energy storage device

Abstract

An energy storage device comprising a positive electrode composed of a polarizable electrode including activated carbon, a negative electrode using a material capable of inserting and extracting lithium ions as an anode active material, and a nonaqueous electrolyte, wherein lithium-containing porous metal oxide is included as the anode active material contained in the negative electrode, and as the lithium-containing porous metal oxide, for example, porous LixSiO is used, and a mixture of the lithium-containing porous metal oxide and a carbon material capable of inserting and extracting lithium ions is preferably used.

Dependencies are inferred from the claim text.