Non-aqueous electrolyte secondary battery

摘要

To provide a high power non-aqueous electrolyte secondary battery with high performance and less degradation in capacity even when high power discharge is repeated while maintaining the initial output characteristic by optimizing the insulating structure between the positive and negative electrodes, in a non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, a microporous resin separator and an electrolyte, an area per theoretical capacity of the positive electrode is set to 190 to 800 cm²/Ah and a porous heat-resistant layer having a thickness of 10 to 60 mum is provided between the separator and at least one of the positive electrode and the negative electrode.