POWER STORAGE DEVICE

摘要

A power storage device with a higher degree of safety is provided. Further, a power storage device with improved cycle life is provided. In the power storage device, an ionic liquid as a solvent of an electrolyte solution, and an exterior body is covered with a conductive component so as to prevent direct contact between a positive electrode current collector and the exterior body. This suppresses elution of the positive electrode current collector due to contact between different kinds of metals and accordingly prevents a phenomenon in which the eluted metal of the positive electrode current collector is deposited on a negative electrode and the deposited metal comes in contact with a positive electrode. Thus, an internal short-circuit caused by the contact can be prevented.