| abstract |
The invention provides an electric storage element having sufficient energy density and sufficient output power. In the present embodiment, there is provided an electricity storage device including a negative electrode having an active material layer, the active material layer containing an active material, the active material layer containing particulate graphite as the active material, a particle size frequency distribution of the graphite having a 1 st peak and a 2 nd peak, the 2 nd peak appearing on a side larger in particle size than the 1 st peak, the 1 st peak having a particle size of 10 μm or less, the 2 nd peak having a particle size of more than 10 μm, the active material layer further containing a particulate high-hardness active material having a hardness higher than that of the graphite. |