LITHIUM ION SECONDARY BATTERY

摘要

Disclosed is a lithium ion secondary battery comprising a positive electrode containing a lithium complex oxide, a chargeable/dischargeable negative electrode, a separator and a nonaqueous electrolyte containing a nonaqueous solvent wherein a solute is dissolved. The separator comprises at least one heat-resistant porous film and at least one shutdown layer. A porous film is bonded to the surface of at least one of the positive and negative electrodes, and the porous film contains an inorganic oxide filler and a binder.