| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve safety without deteriorating charge and discharge characteristics in a nonaqueous electrolyte secondary battery provided with a positive electrode, a negative electrode, and a nonaqueous electrolytic solution containing fluoridated ester as a solvent. <P>SOLUTION: In the nonaqueous electrolytic solution for a secondary battery containing fluoridated ester expressed by a chemical formula CHF<SB>2</SB>COOR, wherein R is alkyl group of carbon numbers 1-4 or halogen atom substitution alkyl group of carbon numbers 1-4, the quantity of moisture of fluoridated ester is set to not more than 30 ppm and a solvent contains cyclic carbonic acid ester having C=C unsaturated bonding. <P>COPYRIGHT: (C)2007,JPO&INPIT |
