LITHIUM ION SECONDARY BATTERY

摘要

Disclosed is a lithium ion secondary battery having a structure wherein a positive electrode and a negative electrode are laminated through a resin separator.  At least one of the positive electrode and the negative electrode is composed of a collector, which comprises a metal layer on both sides of a resin layer serving as a core base, and electrode active material layers formed on the metal layers.  The resin separator is composed of a resin which has a softening point not less than that of the resin constituting the core base.