LITHIUM ION SECONDARY BATTERY

摘要

A lithium ion secondary battery includes a positive electrode comprising a composite lithium oxide; a negative electrode capable of charge and discharge; a separator; and a non-aqueous electrolyte including a non-aqueous solvent and a solute dissolved therein. The separator includes at least one heat-resistant porous film and at least one shut-down layer. A porous membrane is bonded to a surface of at least one selected from the positive electrode and the negative electrode, and the porous membrane comprises an inorganic oxide filler and a binder.