ELECTRICAL STORAGE DEVICE

摘要

An electrical storage device is provided to restrict lithium ion movement to end face of a positive electrode and to prevent the precipitation of metals, thereby improving safety of the storage device. An electrical storage device(10) comprises a positive electrode(13), a negative electrode(14) employing wider surface of a negative electrode than that of the positive electrode, and a separator(15) arranged between the positive electrode and the negative electrode. The positive electrode active material included in the positive electrode can reversibly dope or undope ions and the negative electrode active material included in the negative electrode can reversibly dope or undope ions.