Non-aqueous electrolyte lithium secondary battery

摘要

A lithium secondary battery has an anode, a cathode, a separator between the anode and the cathode and a non-aqueous electrolyte. The non-aqueous electrolyte includes a lithium salt; and a non-linear carbonate-based mixed organic solvent in which (a) a cyclic carbonate compound, and (b) a propionate-based compound are mixed at a volume ratio (a:b) in the range from about 10:90 to about 70:30. The cathode has a capacity density in the range from about 3.5 to about 5.5 mAh/cm2 and a porosity in the range from about 18 to about 35%. This battery may be manufactured as a high-loading lithium secondary battery.

主权项

1. A non-aqueous electrolyte comprising:
a lithium salt; and a non-linear carbonate-based mixed organic solvent consisting of (a) a cyclic carbonate compound expressed by the following Chemical Formula 1 and (b) a propionate-based ester compound expressed by the following Chemical Formula 3 wherein (a) and (b) are mixed at a volume ratio (a:b) in the range from about 10:90 to about 70:30, and (c) a vinylene carbonate expressed by the following Chemical Formula 2, where R3 to R6 are independently any one selected from the group consisting of a hydrogen, fluorine, and an alkyl group having a carbon number of 1 to 4, respectively, and where R7 and R8 are independently a hydrogen or an alkyl group having a carbon number of 1 to 4, respectively, where R1 and R2 are independently a linear or branched C1-6 alkyl group, and at least one of R1 and R2 is substituted with at least one halogen, respectively, and linear carbonate compounds are excluded from the non-aqueous electrolyte.