Patent ID: 8148002

Claim:
An electric storage device comprising: a positive electrode; a negative electrode having a negative electrode surface larger than a positive electrode surface; and a separator arranged between the positive electrode and the negative electrode that are opposite to each other, wherein a positive electrode active material contained in the positive electrode allows ions to be reversibly doped thereinto and de-doped therefrom; wherein a negative electrode active material contained in the negative electrode allows ions to be reversibly doped thereinto and de-doped therefrom; wherein the positive electrode is arranged not to protrude from the negative electrode; wherein the separator is provided with an ion passing section that is in contact with the positive electrode surface and the negative electrode surface so as to allow the movement of ions between the surfaces, and an ion restricting section that is positioned at the outer peripheral portion of the ion passing section for restricting the movement of ions from the positive electrode surface to an end surface of the negative electrode, and wherein the separator is formed to be larger than the positive electrode surface and to be smaller than the negative electrode surface, and an outer edge of the separator is arranged outside of an outer edge of the positive electrode and inside of an outer edge of the negative electrode.