Nonaqueous electrolyte, nonaqueous electrolyte energy storage device, and method for producing nonaqueous electrolyte energy storage device

Abstract

Provided are a nonaqueous electrolyte capable of providing a nonaqueous electrolyte energy storage device with reduced direct current resistance and an increased capacity retention ratio after charge-discharge cycles, a nonaqueous electrolyte energy storage device including such a nonaqueous electrolyte, and a method for producing such a nonaqueous electrolyte energy storage device. One mode of the present invention is a nonaqueous electrolyte for an energy storage device, containing an additive represented by the following Formula (1) or Formula (2). In Formula (1), R 1 to R 4 are each independently a hydrogen atom or a group represented by —NR¾, —ORa, —SRa, etc., with the proviso that at least one of R 1 to R 4 is a group represented by —ORa, —SRa, —COORa, —CORa, —SO2Ra, or —SO3Ra. In Formula (2), R 5 to R 7 are each independently a hydrogen atom or a group represented by —NRb 2 , —OR b , or —SR b , with the proviso that at least one of R 5 to R 7 is a group represented by —SRb.

1 . A nonaqueous electrolyte for an energy storage device, comprising an additive represented by the following Formula (1) or Formula (2): 
       
         
           
           
               
               
           
         
         in Formula (1), R 1  to R 4  are each independently a hydrogen atom or a group represented by —NR a   2 , —OR a , —SR a , —COOR a , —COR a , —SO 2 R a , or —SO 3 R a , wherein R a s are each independently a hydrogen atom or a hydrocarbon group, with the proviso that at least one of R 1  to R 4  is a group represented by —OR a , —SR a , —COOR a , —COR a , —SO 2 R a , or —SO 3 R a , and 
         in Formula (2), R 5  to R 7  are each independently a hydrogen atom or a group represented by —NR b   2 , —OR b , or —SR b , wherein R b s are each independently a hydrogen atom or a C 1-6  alkyl group, with the proviso that at least one of R 5  to R 7  is a group represented by —SR b . 
       
     
     
         2 . The nonaqueous electrolyte according to  claim 1 , wherein
 the additive is represented by Formula (1), and   the R 1  to R 4  are each independently a hydrogen atom or a group represented by —OR a , —SR a , —COOR a , —COR a , —SO 2 R a , or —SO 3 R a .   
     
     
         3 . The nonaqueous electrolyte according to  claim 1 , wherein
 the additive is represented by Formula (1), and   at least one of the R 1  to R 4  is a group represented by —SR a , —SO 2 R a , or —SO 3 R a .   
     
     
         4 . The nonaqueous electrolyte according to  claim 1 , wherein
 the additive is represented by Formula (2), and   the R 5  to R 7  are each independently a group represented by —OR b  or —SR b .   
     
     
         5 . A nonaqueous electrolyte energy storage device, comprising the nonaqueous electrolyte according to  claim 1 . 
     
     
         6 . A method for producing a nonaqueous electrolyte energy storage device, using the nonaqueous electrolyte according to  claim 1 .