Patent ID: 8546021

Claim:
A non-aqueous electrolyte solution for a lithium secondary battery, which includes a lithium salt and an organic solvent, wherein the lithium salt is any one selected from the group consisting of LiPF 6 , LiBF 4 , LiSbF 6 , LiAsF 6 , LiClO 4 , LiN(C 2 F 5 SO 2 ) 2 , LiN(CF 3 SO 2 ) 2 , CF 3 SO 3 Li, LiC(CF 3 SO 2 ) 3 and LiC 4 BO 8 , or their mixtures, wherein the non-aqueous electrolyte solution further includes a solvent having a fluorinated compound and a siloxane compound in the content of 0.5 to 20 weight % and 0.03 to 7 weight %, respectively, based on the entire weight of the non-aqueous electrolyte solution, and wherein the siloxane compound is 1,3-divinyltetramethyldisiloxane and 1,3-dimethyltetravinylsiloxane.