Energy storage device and method for manufacturing energy storage device

A method for manufacturing an energy storage device, the method comprising preparing a positive electrode that includes a positive active material layer containing at least positive active material particles and a binder,

• wherein
• the preparing the positive electrode includes pressing the positive active material layer containing the binder and secondary particles formed by aggregation of primary particles of a positive active material,
• the pressing the positive active material layer includes:
• crushing a part of the secondary particles to allow the positive active material particles contained in the positive active material layer after being pressed to give a volume-based particle size frequency distribution that has a first peak and a second peak appearing in a particle size larger than a particle size of the first peak, and
• crushing the part of the secondary particles to allow positive active material particles having particle sizes equal to or smaller than a particle size Dx to have a volume proportion of 49% or more and 62% or less in a volume of whole positive active material particles contained in the positive active material layer, with the particle size Dx defined as a particle size at a local minimum frequency between the first peak and the second peak in the volume-based particle size frequency distribution.