| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve preservation characteristics at high temperature and avoid degradation of discharge capacity and an initial charge/discharge efficiency, in a lithium-ion secondary battery using a separator containing nonwoven fabric made of fiber containing polyethylene terephthalate effective in viewpoint of safety securing at overcharge. <P>SOLUTION: For the lithium-ion secondary battery with a separator using nonwoven fabric made of fiber containing polyethylene terephthalate (PET), electrolyte solution with LiPF<SB>6</SB>and R-C(=O)-O-CH=CH<SB>2</SB>(R: an alkyl group) dissolved in a nonaqueous solvent of a carbonate group. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
