To provide a nonaqueous electrolyte secondary battery where a decomposition reaction in high temperature environment is suppressed by preventing a PF5- radical from playing the role of a catalyst in the decomposition reaction by transesterification, and thus deterioration of battery characteristics in the high temperature environment can be prevented.
The nonaqueous electrolyte secondary battery, which comprises an electrode body where a positive electrode 5 capable of storing and releasing lithium ions and a negative electrode 6 capable of storing and releasing lithium ions are disposed via a separator impregnated with an electrolyte solution consisting of a solvent and an electrolyte, is characterized in that polyethylene terephthatale is used as the separator, the electrolyte contains LiPF6, and vinylene carbonate is added in the solvent.
NAKANE IKURO
UBUKAWA SATOSHI
