Non-aqueous lithium electricity storage element

Provided is a non-aqueous lithium storage element comprising a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte solution, the positive electrode having a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer comprising activated carbon, the non-aqueous lithium storage element having the following constitution (1) and/or (2): (1) the negative electrode comprising a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer comprising a carbon material; in a binarized image of an SEM image captured on the surface of a negative electrode active material layer, for all pixels in a bright field region, a set of maximum inscribed circles included in each pixel is represented in the form of a frequency distribution for each diameter. The area ratio (Z1) of the total area of maximum inscribed circles having a diameter of less than 100 nm