Granted Patent B2

US 8,741,491 · App. 13/448,923 · Granted Jun 3, 2014

Abstract

Claims (12)

1. A room temperature ionic liquid having a melting point at or below 100° C. at 1 atmosphere comprising an isethionate ion and a cation selected from the group consisting of 1-methyl-1,4-diazabicyclo[2.2.2]octanium, 1-ethyl-2,3-dimethylimidazolium, N-ethyl-N-methylmorpholinium, 1-methylimimdazo[1,2-a]pyridinium, tetramethylammonium, and mixtures thereof.

2. The room temperature ionic liquid of claim 1 , wherein the cation is 1-methyl-1,4-diazabicyclo[2.2.2]octanium.

3. The room temperature ionic liquid of claim 1 , wherein the cation is tetramethylammonium.

4. The room temperature ionic liquid of claim 1 , wherein the cation is 1-ethyl-2,3-dimethylimidazolium.

5. A metal-air cell comprising a fuel electrode for oxidizing a fuel, an air electrode configured to absorb and reduce gaseous oxygen, and a room temperature ionic liquid comprising a sulfonate ion selected from the group consisting of isethionate ([ise]), taurinate ([tau]), 3-morpholinopropanesulfonate (MOPS), 4-(2-hydroxyethyl)-1-piperazinepropanesulfonate (HEPPS, EPPS), 1,4-piperazinediethanesulfonate (PIPES), N-(2-acetamido)-2-aminoethanesulfonate (ACES), N-cyclohexyl-3-aminopropanesulfonate (CAPS), 4-(2-hydroxyethyl)-1-piperazineethanesulfonate (HEPES), 2-[(2-hydroxy-1,1-bis(hydroxymethyl)ethyl)amino]ethanesulfonate (TES), N-[tris(hydroxymethyl)methyl]-3-aminopropanesulfonate (TAPS), 3-(N-tris[hydroxymethyl]methylamino)-2-hydroxypropanesulfonate (TAPSO), and mixtures thereof, and a cation selected from the group consisting of 1-methyl-1,4-diazabicyclo[2.2.2]octanium, 1-ethyl-2,3-dimethylimidazolium, N-ethyl-N-methylmorpholinium, 1-methylimimdazo[1,2-a]pyridinium, tetramethylammonium, and mixtures thereof.

6. The metal-air cell of claim 5 , wherein the sulfonate ion is isethionate.

7. The metal-air cell of claim 5 , wherein the sulfonate ion is taurinate.

8. The metal-air cell of claim 5 , wherein the cation is 1-methyl-1,4-diazabicyclo [2.2.2]octanium.

9. The metal-air cell of claim 5 , wherein the cation is tetramethylammonium.

10. The metal-air cell of claim 5 , wherein the cation is 1-ethyl-2,3-dimethylimidazolium.

11. An ionically conductive medium for use in an electrochemical cell comprising a room temperature ionic liquid having a melting point at or below 100° C. at 1 atmosphere comprising an isethionate ion and a cation selected from the group consisting of 1-methyl-1,4-diazabicyclo[2.2.2]octanium, 1-ethyl-2,3-dimethylimidazolium, N-ethyl-N-methylmorpholinium, 1-methylimimdazo[1,2-a]pyridinium, tetramethylammonium, and mixtures thereof.

12. The ionically conductive medium of claim 11 , wherein the cation is 1-methyl-1,4-diazabicyclo[2.2.2]octanium.

Assignments (8)