Lithium secondary battery electrolytic solution and secondary battery including said electrolytic solution

Abstract

An electrolytic solution system for lithium secondary batteries. Provided is a lithium secondary battery electrolytic solution containing a nonaqueous solvent and a lithium salt. The nonaqueous solvent is mixed at an amount of not more than 3 mol with respect to 1 mol of the lithium salt.

1 .- 11 . (canceled) 
     
     
         12 . An electrolytic solution for lithium secondary batteries, the electrolytic solution comprising a nonaqueous solvent and a lithium salt, wherein the nonaqueous solvent is mixed at an amount of not more than 3 mol with respect to 1 mol of the lithium salt,
 wherein the nonaqueous solvent is acetonitrile, tetrahydrofuran, dimethyl sulfoxide, γ-butyrolactone, or sulfolane, and   wherein the lithium salt is lithium bis(trifluoromethanesulfonyl)amide (Li[N(CF 3 SO 2 ) 2 ]), lithium bis(perfluoroethylsulfonyl)amide (Li[N(C 2 F 5 SO 2 ) 2 ]), or lithium bis(fluorosulfonyl)amide (LiN(SO 2 F) 2 ).   
     
     
         13 . A secondary battery comprising: a positive electrode including a positive electrode active material; a negative electrode including a negative electrode active material capable of occluding and releasing lithium ions; and the electrolytic solution for lithium secondary batteries according to  claim 12 .