| 摘要 |
PURPOSE: A nonaqueous electrolyte solution for a secondary battery is provided, to charge/discharge characteristics, lifetime and high rate discharge characteristics at low temperature and to reduce the irreversible reaction and the thickness expansion in high temperature storage by adding a methyl trifluoroalkane sulfonate. CONSTITUTION: The nonaqueous electrolyte solution for a secondary battery comprises 0.1-10 wt% of a methyl trifluoroalkane sulfonate compound represented by the formula as an additive, wherein R is an alkyl or alkenyl group of C1-C5. The secondary battery is a lithium ion secondary battery, an aluminum laminated battery or a lithium polymer battery which uses a positive electrode active material which is a lithium metal oxide selected from the group consisting of LiCoO2, LiMnO2, LiMn2O4, LiNiO2 and LiNixMn_(1-x) O2 or a composite compound (LIM1xM2yO2) and a negative electrode active material which is a crystalline or amorphous carbon or a lithium metal. Preferably the organic solvent used in the electrolyte solution is ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, ethylmethyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, fluorobenzene or their mixture; and the lithium salt used in the electrolyte solution is at least one selected from the group consisting of LiPF6, LiClO4, LiAsF6 and LiBF4. |
