| abstract |
An object of the present invention is to provide an electrical storage device having a large charge and discharge capacity, capable of rapid charge and discharge, and having little deterioration in battery characteristics due to charge and discharge. The present invention is an electrical storage device, wherein the negative electrode includes an active material having a plurality of columnar protrusions, and the cross-sectional shape perpendicular to the axis of the columnar protrusions is, for example, cross-shaped, H-shaped, L-shaped, I-shaped, T-shaped, Polygonal shapes such as U-shape and Z-shape, or polygonal shapes including curved lines. Active materials with multiple columnar protrusions can also be covered with graphene. |