SEPARATOR, BATTERY, BATTERY PACK, ELECTRONIC DEVICE, ELECTRIC VEHICLE, ELECTRICITY STORAGE DEVICE AND ELECTRIC POWER SYSTEM

摘要

A separator includes a substrate layer and a porous surface layer that is provided on at least one major surface of the substrate layer and contains a first particle, a second particle, and a resin material. The surface layer includes a first region configured by the first particle and a second region configured by the second particle and the resin material.