Nonaqueous electrolytic solution and nonaqueous electrolyte secondary battery

Abstract

A nonaqueous electrolytic solution that can provide a high energy density nonaqueous electrolyte secondary battery having a high capacity, excellent storage characteristics, and excellent cycle characteristics and suppressing the decomposition of an electrolytic solution and the deterioration thereof when used in a high-temperature environment includes an electrolyte, a nonaqueous solvent, and a compound represented by general formula (1): wherein R 1 , R 2 , and R 3 each independently represent a hydrogen atom, a cyano group, or an optionally halogen atom-substituted hydrogen group having 1 to 10 carbon atoms, with the priviso that R 1 and R 2 do not simultaneously represent hydrogen atoms.

1 . (canceled) 
     
     
         2 . A nonaqueous electrolyte secondary battery, comprising
 a positive electrode having a positive-electrode active material capable of storing and releasing metal ions,   a negative electrode having a negative-electrode active material containing Si and capable of storing and releasing metal ions, and   a nonaqueous electrolytic solution comprising a compound containing 2 to 4 cyano groups and a carbonate containing a halogen atom.   
     
     
         3 . The nonaqueous electrolyte secondary battery according to  claim 2 , wherein the compound containing 2 to 4 cyano groups is represented by formula (1):
   NC—(X) n —CN   (1),
   
       where
 each X is independently CH 2 , CFH, CF 2 , CHR, CFR, CR 2 , C═O, O, S, NH, or NR; 
 each R in CHR, CFR, CR 2 , and NR is independently an optionally substituted hydrocarbon group comprising from 1 to 5 carbon atoms or a cyano group; and 
 n is an integer of 1 or more. 
 
     
     
         4 . The nonaqueous electrolytic secondary battery according to  claim 3 , wherein each X is independently CH 2 , CFH, CF 2 , CHR, CFR, CR 2 , O, S, or NR. 
     
     
         5 . The nonaqueous electrolytic secondary battery according to  claim 3 , wherein the compound represented by the formula (1) is at least one compound selected from the group consisting of succinonitrile, glutaronitrile, adiponitrile, pimelonitrile, suberonitrile, azelanitrile, sebaconitrile, 3,3′-oxydipropionitrile, 3,3′-thiodipropionitrile, 1,2,3-propanetricarbonitrile, 1,3,5-pentanetricarbonitrile, undecanedinitrile, dodecanedinitrile, 1,2,3-tris(2-cyanoethoxy)propane, and tris(2-cyanoethyl)amine. 
     
     
         6 . The nonaqueous electrolytic secondary battery according to  claim 3 , wherein n is an integer of 5 or more. 
     
     
         7 . The nonaqueous electrolytic secondary battery according to  claim 3 , wherein the compound represented by the formula (1) is at least one compound selected from the group consisting of pimelonitrile, suberonitrile, azelanitrile, sebaconitrile, 3,3′-oxydipropionitrile, 1,3,5-pentanetricarbonitrile, undecanedinitrile, and dodecanedinitrile. 
     
     
         8 . The nonaqueous electrolytic secondary battery according to  claim 2 , wherein the halogen atom-containing carbonate is at least one compound selected from the group consisting of fluoroethylene carbonate, 4,5-difluoroethylene carbonate, and a derivative thereof. 
     
     
         9 . The nonaqueous electrolytic secondary battery according to  claim 2 , wherein the nonaqueous electrolytic solution contains 0.001 to 10% by weight of the compound containing 2 to 4 cyano groups. 
     
     
         10 . The nonaqueous electrolytic secondary battery according to  claim 3 , wherein n is an integer of from 5 to 12.