Battery, battery pack, electronic apparatus, electrically driven vehicle, electrical storage device, and power system

Abstract

A battery is provided. The battery including a positive electrode that includes a positive electrode current collector and a positive electrode active material layer provided on the positive electrode current collector; a negative electrode; and a separator that includes at least a porous film; wherein the porous film satisfies the following equations: 0.04≤Ri≤−0.07L−0.09×S+4.99 Ri=τ2L/ε′ ε′=[{(Lε/100)−Rz×0.46/3}/L]×100 τ={(1.216×εTd×10−4)/L}0.5 where Ri represents a film resistance (μm), L represents a film thickness (μm), τ represents a tortuosity factor, T represents air permeability (sec/100 cc), d represents a pore size (nm), Rz represents a surface roughness maximum height (μm), ε represents a porosity (%), ε′ represents a corrected porosity (%), and S represents an area density of the positive electrode active material layer (mg/cm2).

Dependencies are inferred from the claim text.