NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

Disclosed is a nonaqueous electrolyte secondary battery wherein the separator contains a heat-resistant resin having a chlorine atom as a terminal group and the positive electrode active material contains a lithium-containing complex oxide having an aluminum atom in the composition. In this nonaqueous electrolyte secondary battery, even if the chlorine atom is liberated into the nonaqueous electrolyte solution, aluminum contained in the positive electrode active material is selectively dissolved into the nonaqueous electrolyte solution, thereby suppressing dissolution of other constitutional elements. Consequently, there can be obtained a nonaqueous electrolyte secondary battery which is excellent in safety and high-temperature storage characteristics.