| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery superior in liquid leakage resistance and cycle characteristics. <P>SOLUTION: This is the nonaqueous electrolyte secondary battery equipped with a positive electrode, a negative electrode, a nonaqueous electrolytic solution, a separator arranged between the both electrodes, and an outer sheath member made of a laminated film to house these. A polymer support is interposed between the positive electrode and/or the negative electrode, and the separator. There exists the nonaqueous electrolytic solution of 0.14 to 0.35 g per a battery capacity 1 cm<SP>3</SP>in this battery, a nonaqueous solvent constituting the nonaqueous electrolytic solution contains cyclic carbonate of weight ratio of 20 to 50% and low viscosity nonaqueous solvent of 50 to 80%, and as the low viscosity nonaqueous solvent, a chain-like carbonate having a boiling point of 130°C or more is desirably used. <P>COPYRIGHT: (C)2008,JPO&INPIT |
