Electric storage device

摘要

An electric storage device (10) has a positive electrode (13), a negative electrode (14) and a separator (15) provided between the positive electrode (13) and the negative electrode (14). The negative electrode surface (14b) is formed to be larger than the positive electrode surface (13b) in such a manner that a positive electrode outer edge (13c) and a negative electrode outer edge (14c) are apart from each other by 2 mm or more. By this configuration, an ion restricting section (15b) is formed at the outer peripheral portion of the separator (15). Accordingly, the movement of lithium ions toward the negative electrode end surface (14a) can be restricted, when the device is charged with a large current, whereby the deposition of metal lithium on the negative electrode end surface (14a) can be prevented.