| 摘要 |
PROBLEM TO BE SOLVED: To provide a thin-type nonaqueous electrolyte secondary battery having high safety and high reliability as well as an excellent charge-discharge cycle characteristic in a wide temperature range. SOLUTION: This thin-type nonaqueous electrolyte secondary battery has such structure that an electrode body comprising a positive electrode capable of storing and discharging lithium, a negative electrode containing a carbonaceous material capable of storing and discharging lithium, and a separator, and a nonaqueous electrolyte are stored in an outer film formed of a laminated films with a gas barrier film interposed between the films. In the nonaqueous electrolyte, an electrolyte is mainly composed of lithium tetrafluoro forate, and a nonaqueous solvent is composed of γ-butyrolactone or a mixture of γ- butyrolactone and cyclic carbonate and further includes at least one compound selected out of vinylene carbonate, a vinylene carbonate derivative and vinyl ethylene carbonate. |
