Electrolyte

Abstract

An electrolyte for a battery comprises LiBOB salt in gamma butyrolactone and a low viscosity solvent. The low viscosity solvent may comprise a nitrile, an ether, a linear carbonate, or a linear ester. This electrolyte is suitable for use in lithium ion batteries having graphite negative electrodes. Batteries using this electrolyte have high conductivity, low polarization, and high discharge capacity.

1 - 50 . (cancelled).  
     
     
         51 . An electrolyte consisting of: 
 one or more salts, including LiBOB;    one or more lactones; and    one or more low viscosity solvents; wherein    the electrolyte is capable of forming an effective SEI layer on an electrode.    
     
     
         52 . The electrolyte of  claim 51  wherein the one or more salts does not contain fluorine.  
     
     
         53 . The electrolyte of  claim 51  wherein the one or more salts consists of LiBOB.  
     
     
         54 . The electrolyte of  claim 51  wherein the one or more lactones includes gamma-butyrolactone.  
     
     
         55 . The electrolyte of  claim 51  wherein the one or more lactones consists of gamma-butyrolactone.  
     
     
         56 . The electrolyte of  claim 51  wherein the one or more low viscosity solvents includes a linear ester.  
     
     
         57 . The electrolyte of  claim 51  wherein the one or more low viscosity solvents consists of a linear ester.  
     
     
         58 . The electrolyte of  claim 51  wherein the one or more low viscosity solvents includes propyl acetate.  
     
     
         59 . The electrolyte of  claim 51  wherein the one or more low viscosity solvents consists of propyl acetate.  
     
     
         60 . The electrolyte of  claim 51  wherein the one or more low viscosity solvents includes methyl acetate.  
     
     
         61 . The electrolyte of  claim 51  wherein the one or more low viscosity solvents includes a nitrile.  
     
     
         62 . The electrolyte of  claim 51  wherein the one or more low viscosity solvents includes acetonitrile.  
     
     
         63 . The electrolyte of  claim 51  wherein the one or more low viscosity solvents includes an ether.  
     
     
         64 . The electrolyte of  claim 51  wherein the one or more low viscosity solvents includes dimethyl ether.  
     
     
         65 . The electrolyte of  claim 51  wherein the one or more low viscosity solvents includes a linear carbonate.  
     
     
         66 . The electrolyte of  claim 51  wherein the one or more low viscosity solvents includes diethyl carbonate.  
     
     
         67 . The electrolyte of  claim 51  wherein the one or more low viscosity solvents includes methyl ethyl carbonate.  
     
     
         68 . The electrolyte of  claim 51  wherein the one or more low viscosity solvents includes tetrahydrofuran.  
     
     
         69 . The electrolyte of  claim 51  wherein the concentration of LiBOB is greater than 0.5 M.  
     
     
         70 . The electrolyte of  claim 51  wherein the concentration of LiBOB is greater than 1.0 M.  
     
     
         71 . The electrolyte of  claim 51  wherein the concentration of LiBOB is about 1.2 M.  
     
     
         72 . A lithium battery comprising: 
 a battery case;    an electrode assembly housed in the case; and    an electrolyte in the case, the electrolyte including one or more lactones, one or more low viscosity solvents, one or more salts, and being capable of forming an effective SEI layer on an electrode; wherein the one or more salts includes LiBOB.    
     
     
         73 . The battery of  claim 72  wherein the battery is rechargeable.  
     
     
         74 . The battery of  claim 72  wherein the battery is a lithium ion battery.  
     
     
         75 . The battery of  claim 72  wherein the battery is a lithium polymer battery.  
     
     
         76 . The battery of  claim 72  wherein the electrode assembly includes a graphite negative electrode.  
     
     
         77 . The battery of  claim 72  wherein the one or more lactones includes gamma-butyrolactone.  
     
     
         78 . The battery of  claim 72  wherein the one or more low viscosity solvents includes a linear ester.  
     
     
         79 . The battery of  claim 72  wherein the one or more low viscosity solvents includes propyl acetate.  
     
     
         80 . The battery of  claim 72  wherein the one or more low viscosity solvents includes methyl acetate.  
     
     
         81 . The battery of  claim 72  wherein the one or more low viscosity solvents includes a nitrile.  
     
     
         82 . The battery of  claim 72  wherein the one or more low viscosity solvents includes acetonitrile.  
     
     
         83 . The battery of  claim 72  wherein the one or more low viscosity solvents includes an ether.  
     
     
         84 . The battery of  claim 72  wherein the one or more low viscosity solvents includes dimethyl ether.  
     
     
         85 . The battery of  claim 72  wherein the one or more low viscosity solvents includes a linear carbonate.  
     
     
         86 . The battery of  claim 72  wherein the one or more low viscosity solvents includes diethyl carbonate.  
     
     
         87 . The battery of  claim 72  wherein the one or more low viscosity solvents includes methyl ethyl carbonate.  
     
     
         88 . The battery of  claim 72  wherein the one or more low viscosity solvents includes tetrahydrofuran.  
     
     
         89 . The battery of  claim 72  wherein the concentration of LiBOB is greater than 0.5 M.  
     
     
         90 . The battery of  claim 72  wherein the concentration of LiBOB is greater than 1.0 M.  
     
     
         91 . The battery of  claim 72  wherein the concentration of LiBOB is about 1.2 M.  
     
     
         92 . An implantable medical device including the battery of  claim 72 .  
     
     
         93 . A method for making a battery comprising the steps of: 
 providing a battery case;    housing an electrode assembly within the battery case; and    inserting an electrolyte into the battery case, the electrolyte including one or more lactones, one or more low viscosity solvents, one or more salts, and being capable of forming an effective SEI layer on an electrode; wherein the one or more salts includes LiBOB.