Energy storage device and energy storage module

Abstract

Provided is an energy storage device provided with a negative electrode including a negative substrate having a surface, and a negative composite layer formed on the surface of the negative substrate and including a negative active material; a positive electrode including a positive substrate, and a positive composite layer formed on the positive substrate and including a positive active material; and a separator placed between the positive electrode and the negative electrode. 10% cumulative diameter D10 in the particle size distribution of the negative active material on a volume basis is 1.3 μm or more, and 90% cumulative diameter D90 in the particle size distribution of the negative active material on a volume basis is 8.9 μm or less. The surface of the negative substrate has a center line roughness Ra of 0.205 μm or more and 0.781 μm or less, and has a center line roughness Ra to a ten-point mean height Rz of 0.072 or more and 0.100 or less.

Dependencies are inferred from the claim text.