Nonaqueous electrolyte for lithium secondary battery and lithium secondary battery employing the same

1. A nonaqueous electrolyte for a lithium secondary battery, the nonaqueous electrolyte comprising:

a fluorine-containing lithium salt;

an organic solvent; and

an organosilicon compound represented by Formula 1:

wherein, in Formula 1, R 1 to R 6 are each independently a C 1 -C 10 alkyl group or a C 1 -C 10 alkoxy group.

2. The nonaqueous electrolyte of claim 1 , wherein an amount of the organosilicon compound is in a range of about 0.05 percent by weight to about 10 percent by weight, based on a total weight of the nonaqueous.

3. The nonaqueous electrolyte of claim 1 , wherein an anion of the fluorine-containing lithium salt comprises F − , BF 4 − , PF 6 − , (CF 3 ) 2 PF 4 − , (CF 3 ) 3 PF 3 − , (CF 3 ) 4 PF 2 − , (CF 3 ) 5 PF − , (CF 3 ) 6 P − , CF 3 SO 3 − , CF 3 CF 2 SO 3 − , (CF 3 SO 2 ) 2 N − , (FSO 2 ) 2 N − , CF 3 CF 2 (CF 3 ) 2 CO − , (CF 3 SO 2 ) 2 CH − , (SF 5 ) 3 C − , (CF 3 SO 2 ) 3 C − , CF 3 (CF 2 ) 7 SO 3 − , CF 3 CO 2 − , (CF 3 CF 2 SO 2 ) 2 N − , or a combination thereof.

4. The nonaqueous electrolyte of claim 1 , further comprising an additional lithium salt, wherein an anion of the additional lithium salt comprises Cl − , Br − , I − , NO 3 − , N(CN) 2 − , ClO 4 − , CH 3 CO 2 − , SCN − , or a combination thereof.

5. The nonaqueous electrolyte of claim 1 , wherein the organic solvent comprises an ether, an ester, an amide, a linear carbonate, a cyclic carbonate, or a combination thereof.

6. The nonaqueous electrolyte of claim 1 , further comprising vinylene carbonate, vinyl ethylene carbonate, fluoroethylene carbonate, cyclic sulfite, saturated sultone, unsaturated sultone, an acyclic sulfone, or a combination thereof.

7. A lithium secondary battery comprising the nonaqueous electrolyte according to claim 1 .