| abstract |
The invention provides an energy storage device (10), including a positive electrode plate (410) and a negative electrode plate (420) that are insulated from each other with a separator (430) interposed therebetween, and a non-aqueous electrolyte, the separator (430) includes a base material layer (431) and a coating layer (432) that is disposed on at least one surface of the base material layer (431), and the separator has an air permeability of the base material layer (431) of 25 (sec/100 cc) or greater and 250 (sec/100 cc) or less, a porosity of the base material layer (431) of 45% or greater, an air permeability of an interface (433) between the base material layer (431) and the coating layer (432) of 15 (sec/100 cc) or less, and an air permeability of the coating layer (432) of 15 (sec/100 cc) or less. |