Organic electrolytic solution and lithium battery employing the same

Abstract

An organic electrolytic solution comprising a nonaqueous solvent and a lithium salt, wherein the organic electrolytic solution comprises a compound of Formula 1 and at least one selected from compounds of Formulas 2 through 5: wherein R 1 a C1˜C10 alkoxy group, wherein R 2 and R 3 are independently unsubstituted C1˜C5 alkyl group or C1˜C5 alkyl group substituted with halogen atom, wherein n is an integer between 1 and 6.

What is claimed is:  
     
         1 . An organic electrolytic solution comprising a nonaqueous solvent and a lithium salt, wherein the organic electrolytic solution comprises a compound of Formula 1 and at least one selected from compounds of Formulas 2 through 5:  
       
         
           
           
               
               
           
         
       
       wherein R 1  a C1˜C10 alkoxy group,  
       
         
           
           
               
               
           
         
       
       wherein R 2  and R 3  are independently unsubstituted C1˜C5 alkyl group or C1˜C5 alkyl group substituted with halogen atom,  
       
         
           
           
               
               
           
         
       
       wherein n is an integer between 1 and 6.  
     
     
         2 . The organic electrolytic solution of  claim 1 , wherein the total amount of the compound of Formula 1 and at least one among the compounds of Formulas 2 through 5 is 0.01 to 1.5 parts by weight per 100 parts by weight of the nonaqueous solvent.  
     
     
         3 . The organic electrolytic solution of  claim 1 , wherein the compound of Formula 1 and at least one selected from compounds of Formulas 2 through 5 are mixed in a ratio of 1:1.5-1:40 by weight.  
     
     
         4 . The organic electrolytic solution of  claim 1 , wherein the nonaqueous solvent includes the cyclic carbonate solvent and the chain carbonate solvent.  
     
     
         5 . The organic electrolytic solution of  claim 4 , wherein the cyclic carbonate solvent and the chain carbonate solvent are mixed in a ratio of 1:1-1:4 by volume.  
     
     
         6 . The organic electrolytic solution of  claim 4 , wherein the chain carbonate solvent is at least one selected from the group consisting of dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, dipropyl carbonate, dimethoxyethane, diethoxyethane and a C3˜C8 aliphatic ester derivative.  
     
     
         7 . The organic electrolytic solution of  claim 4 , wherein the cyclic carbonate solvent is at least one selected from the group consisting of ethylene carbonate, propylene carbonate, butylene carbonate and γ-butyrolactone.  
     
     
         8 . The organic electrolytic solution of  claim 1 , wherein the compound of Formula 4 is dimethyl vinylene carbonate.  
     
     
         9 . The organic electrolytic solution of  claim 1 , wherein the compound of Formula 5 is fluorobenzene, difluorobenzene, trifluorobenzene, tetrafluorobenzene, pentafluorobenzene or hexafluorobenzene.  
     
     
         10 . The organic electrolytic solution of  claim 1 , wherein the lithium salt composing the organic electrolytic solution is at least one selected from the group consisting of LiClO 4 , LiCF 3 SO 3 , LiPF 6 , LiN(CF 3 SO 2 ), LiBF 4 , LiC(CF 3 SO 2 ) 3 , and LiN(C 2 F 5 SO 2 ) 2 , and the concentration of the lithium salt is about 0.5 to about 2 M.  
     
     
         11 . A lithium battery comprising: 
 a cathode;    an anode; and    an organic electrolytic solution comprising a nonaqueous solvent and a lithium salt, wherein the organic electrolytic solution comprises a compound of Formula 1 and at least one selected from compounds of Formulas 2 through 5:                          wherein R 1  a C1˜C10 alkoxy group,                          wherein R 2  and R 3  are independently unsubstituted C1˜C5 alkyl group or C1˜C5 alkyl group substituted with halogen atom,                          wherein n is an integer between 1 and 6.    
     
     
         12 . The lithium battery of  claim 11 , wherein the total amount of the compound of Formula 1 and at least one among the compounds of Formulas 2 through 5 is 0.01 to 1.5 parts by weight per 100 parts by weight of the nonaqueous solvent.  
     
     
         13 . The lithium battery of  claim 11 , wherein the compound of Formula 1 and at least one selected from compounds of Formulas 2 through 5 are mixed in a ratio of 1:1.5-1:40 by weight.  
     
     
         14 . The lithium battery of  claim 11 , wherein the nonaqueous solvent includes the cyclic carbonate solvent and the chain carbonate solvent.  
     
     
         15 . The lithium battery of  claim 14 , wherein the cyclic carbonate solvent and the chain carbonate solvent are mixed in a ratio of 1:1-1:4 by volume.