| 摘要 |
PURPOSE: Provided is an electrolyte for a lithium secondary battery, which can reduce swelling at high temperature and can improve charge/discharge property, lifetime property, temperature property, high ratio discharge property at low temperature, open circuit voltage drop, and capacity recovery. CONSTITUTION: The electrolyte for the lithium secondary battery comprises: a cathode active material selected from LiCoO2, LiMn2O4, LiNiO2, or a complex compound(LiMxNyO2), wherein M and N are metal elements, x and y are rational numbers of 0-2, and an anode active material being crystalline or amorphous carbon or metal lithium; a mixed solvent containing at least one carbonate-based solvent; at least one lithium salt, as an electrolyte salt, selected from LiPF6, LiBF4, LiClO4, LiN(SO2CF3)2, and LiN(SO2CF2CF2)2; a mixed additive comprising 0.1-5.0wt%(based on the final electrolyte) of perfluoro-1-butanesulfonyl fluoride(formula 1) and 0.1-5.0wt%(based on the final electrolyte) of divinyl sulfone(formula 2). The carbonate-based solvent is selected from EC, DMC, EMC, PD, and DEC. |
