MODIFIED IONIC LIQUIDS CONTAINING BORON

1 . An ionic liquid compound, comprising:

an anion; and

a cation attached to a boron moiety according to the formula:

wherein:

CAT + is a pyrrolidinium, piperdinium, azepanium, onium, sulfonium, phosphonium, imidazolium, pyridine or a 5- or 6-membered heterocyclic ring having 1 to 3 heteroatoms as ring members comprising nitrogen, oxygen, silicon or sulfur;

R 1 and R 2 are independently, CAT + , a methyl, or C 2 -C 8 alkyl, alkenyl, alkoxy, aryl, alkynyl, alkylsiloxy, phenyl, benzyl, silyl, thioether, sulfoxide, azo, amino or silane group, wherein any of the carbon or hydrogen atoms therein are optionally further substituted with a halide, alkyl, alkenyl, alkoxy, aryl, alkynyl, alkylsiloxy, phenyl, benzyl, silyl, thioether, sulfoxide, azo, amino or silane;

X 1 , X 2 , and X 3 are independently (a) a linker comprising a methylene, or C 2 -C 8 alkylene, alkenylene, alkynylene, alkoxy, ester, carbonylene, phenylene, thioether, sulfoxide, azo or arylene group, wherein any of the carbon or hydrogen atoms therein are optionally further substituted with a halide; (b) O, S, or C; or (c) O, S, N, or C attached to the linker.

2 . The compound of claim 1 , wherein the anion comprises a halide, aluminates, arsenides, cyanides, thiocyanates, nitrites, benzoates, chlorates, chlorites, chromates, sulfates, sulfites, silicates, thiosulfates, oxalates, acetates, formates, hydroxides, nitrate, phosphate, imide, or borate.

3 . An electrical energy storage device electrolyte comprising:

a) an aprotic organic solvent system;

b) a metal salt;

c) an additive; and

d) an ionic liquid compound according to claim 1 .

4 . The electrolyte of claim 3 , wherein the anion comprises a halide, aluminates, arsenides, cyanides, thiocyanates, nitrites, benzoates, chlorates, chlorites, chromates, sulfates, sulfites, silicates, thiosulfates, oxalates, acetates, formates, hydroxides, nitrate, phosphate, imide, or borate.

5 . The electrolyte of claim 3 , wherein the aprotic organic solvent comprises open-chain or cyclic carbonates, carboxylic acid esters, nitrites, ethers, sulfones, ketones, lactones, dioxolanes, glymes, crown ethers, siloxanes, phosphoric acid esters, phosphates, phosphites, mono- or polyphosphazenes or mixtures thereof.

6 . The electrolyte of claim 3 , wherein the cation of the metal salt comprises aluminum or magnesium.

7 . The electrolyte of claim 3 , wherein the cation of the metal salt comprises an alkali metal salt.

8 . The electrolyte of claim 7 , wherein the cation of the alkali metal salt comprises lithium or sodium.

9 . The electrolyte of claim 3 , wherein the additive comprises sulfur-containing compounds, phosphorus-containing compounds, boron-containing compounds, silicon-containing compounds, fluorine-containing compounds, nitrogen-containing compounds, compounds containing at least one unsaturated carbon-carbon bond, carboxylic acid anhydrides or the mixtures thereof.