LITHIUM ION SECONDARY BATTERY

摘要

A lithium ion secondary battery is disclosed which comprises a positive electrode capable of adsorbing/desorbing lithium ions, a negative electrode capable of adsorbing/desorbing lithium ions, a porous membrane disposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The porous membrane is adhered to at least the surface of one of the positive electrode and the negative electrode, and is composed of a filler and a resin binder, containing 1.5-8 parts by weight of the resin binder per 100 parts by weight of the filler. The resin binder contains an acrylonitrile unit, an acrylate unit, or a methacrylate unit.