| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte composition capable of suppressing swelling of a battery housing in a high temperature storage without adding divinyl sulfone, and a nonaqueous electrolyte secondary battery using such a nonaqueous electrolyte composition. <P>SOLUTION: By adding electrolyte salt, cyclic carboxylic acid ester such as γ-butyrolactone, and halogenated cyclic carbonate such as fluoroethylene carbonate in a nonaqueous solvent so that the content in the nonaqueous solvent becomes 0.1% or more and less than 1% and 0.5% or more and less than 5% by weight ratio respectively, the nonaqueous electrolyte composition is made and by using such a nonaqueous electrolyte composition, the nonaqueous electrolyte secondary battery is obtained. <P>COPYRIGHT: (C)2008,JPO&INPIT |
