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

摘要

PROBLEM TO BE SOLVED: To provide a battery capable of achieving both high capacity and high output, and a battery pack, an electronic apparatus, an electric vehicle, an electricity storage device and an electric power system which use the battery.SOLUTION: In a battery, the area density S (mg/cm) of a positive electrode active material layer is 30 mg/cmor more, and the porosity &egr; (%) and the air permeability t (sec/100 cc) of a porous film included in a separator satisfy a predetermined expression.