Electrolyte formulations for lithium ion batteries

Abstract

Electrolyte solutions including combinations of high dielectric and low viscosity solvents. These solvent combinations provide low temperature performance and high temperature stability in lithium ion battery cells.

1 . A lithium ion battery cell, comprising:
 a first electrode;   a second electrode comprising lithium titanate; and   an electrolyte solution, the electrolyte solution comprising sulfolane and diethyl carbonate.   
     
     
         2 . The battery cell of  claim 1 , wherein the electrolyte solution does not contain ethylene carbonate or propylene carbonate. 
     
     
         3 . The battery cell of  claim 1 , wherein the electrolyte solution comprises propylene carbonate. 
     
     
         4 .- 7 . (canceled) 
     
     
         8 . A lithium ion battery cell, comprising:
 a first electrode;   a second electrode comprising lithium titanate; and   an electrolyte solution, the electrolyte solution comprising sulfolane and isobutyl acetate.   
     
     
         9 . (canceled) 
     
     
         10 . A lithium ion battery cell, comprising:
 a first electrode;   a second electrode comprising lithium titanate; and   an electrolyte solution, the electrolyte solution comprising sulfolane and methyl isovalerate.   
     
     
         11 .- 25 . (canceled) 
     
     
         26 . The battery cell of  claim 8 , wherein the electrolyte solution does not contain ethylene carbonate or propylene carbonate. 
     
     
         27 . The battery cell of  claim 8 , wherein the electrolyte solution comprises propylene carbonate. 
     
     
         28 . The battery cell of  claim 10 , wherein the electrolyte solution does not contain ethylene carbonate or propylene carbonate. 
     
     
         29 . The battery cell of  claim 10 , wherein the electrolyte solution comprises propylene carbonate. 
     
     
         30 . The battery cell of  claim 1  wherein the electrolyte solution further comprises at least one linear carbonate solvent. 
     
     
         31 . The battery cell of  claim 30  wherein the linear carbonate solvent is ethyl methyl carbonate, dimethyl carbonate, or a combination thereof. 
     
     
         32 . The battery cell of  claim 8  wherein the electrolyte solution further comprises at least one linear carbonate solvent. 
     
     
         33 . The battery cell of  claim 32  wherein the linear carbonate solvent is ethyl methyl carbonate, dimethyl carbonate, or a combination thereof. 
     
     
         34 . The battery cell of  claim 10  wherein the electrolyte solution further comprises at least one linear carbonate solvent. 
     
     
         35 . The battery cell of  claim 34  wherein the linear carbonate solvent is ethyl methyl carbonate, dimethyl carbonate, or a combination thereof.