LITHIUM ION SECONDARY BATTERY

摘要

Provided is a highly safe lithium ion secondary battery. An electrode plate group is configured to have: a resin separator having a thickness of 15-50 μm; and a positive electrode plate and a negative electrode plate, which are laminated with the resin separator being interposed therebetween. Particles of a metal or a metal compound, which have particle diameters of 20 μm or more, are present between the resin separator and the positive electrode plate or the negative electrode plate. The volume (V1) of the particles of a metal or a metal compound and the void volume (V2) per 1 μm2 of the resin separator satisfy the following relational expression: V1/V2 < 2,250.