Liquid electrolyte for an electrochemical cell

• US 20040161671A1
• Filed: 02/13/2003
• Published: 08/19/2004
• Est. Priority Date: 02/13/2003
• Status: Abandoned Application

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Schmidt, Craig L., Merritt, Donald R.
• Application Number:
  US10/366,214
• Publication Number:
  US 20040161671A1
• Time in Patent Office: Days
• US Class Current: 429/326
• CPC Class Codes: A61N 1/378 Electrical supply
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0567 characterised by the additives
• CPC Class Codes: H01M 4/381 Alkaline or alkaline earth metals elements H01M4/40 takes precedence
• CPC Class Codes: H01M 4/483 for non-aqueous cells H01M4/485 takes precedence
• CPC Class Codes: H01M 6/168 by additives
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A liquid electrolyte for use in an electrochemical cell having an alkali metal anode is provided. The liquid electrolyte comprises an additive formed of at least one selected from the group comprising: a tautomer; an alcohol having the formula R—OH, where R is one selected from the group comprising an unsaturated carbon chain having at least two carbon atoms, a saturated carbon chain having at least one carbon atom, and an aromatic carbon chain; a sugar; and an acid selected from the group comprising nitric acid, sulfuric acid and sulfuric acid partially substituted with an ion of said alkali metal material.

Claims

1. A liquid electrolyte for use in an electrochemical cell having an alkali metal anode, the liquid electrolyte comprising an additive formed of at least one selected from the group comprising:

a tautomer;

an alcohol having the formula R—

OH, where R is one selected from the group comprising an unsaturated carbon chain having at least two carbon atoms, a saturated carbon chain having at least one carbon atom, and an aromatic carbon chain;

a sugar; and

an acid selected from the group comprising nitric acid, sulfuric acid and sulfuric acid partially substituted with an ion of said alkali metal material.

2. The liquid electrolyte of claim 1, said alkali metal anode comprising one of lithium, sodium, and potassium.

3. The liquid electrolyte of claim 1, further comprising an organic solvent.

4. The liquid electrolyte of claim 3, said organic solvent comprising at least one selected from the group comprising diethyl carbonate, dimethylcarbonate, butylene carbonate, 3-methyl-2-oxazolidone, sulfolane, tetrahydrofuran, methyl-substituted tetrahydrofuran, 1,3-dioxolane, propylene carbonate (PC), ethylene carbonate, gamma-butyrolactone, ethylene glycol sulfite, dimethylsulfite, dimethyl sulfoxide, dimethoxyethane, dimethyl isoxazole, dioxane, ethyl methyl carbonate, diglyme, and methyl formate.

5. The liquid electrolyte of claim 1, further comprising an alkali metal salt.

6. The liquid electrolyte of claim 1, wherein said tautomer comprise one selected from the group comprising nitromethane, urea, ketones, carbonyls, imines, enamines, nitrosos functional groups, oxime functional groups, nitros functional groups, aci-nitro functional groups, nitriles, keto-alcohols, hemiketals, keto-acids, and lactols.

7. The liquid electrolyte of claim 6, wherein said tautomer is a carbonyl selected from the group comprising carboxylic acid, carboxylic diacid, and salts thereof.

8. The liquid electrolyte of claim 1, wherein said alcohol comprises a polyol.

9. The liquid electrolyte of claim 1, wherein said sugar comprises one selected from the group comprising glucose, sucrose, and fructose.

10. The liquid electrolyte of claim 1, wherein the additive is present in the liquid electrolyte in the range of about 0.001 to about 0.4 M.

11. An electrochemical cell comprising:

an anode comprising an alkali metal material;

a cathode;

a liquid electrolyte operatively associated with the anode and the cathode, said electrolyte comprising an additive comprising at least one selected from the group comprising;

a tautomer;

an alcohol having the formula R—

OH, where R is one selected from the group comprising an unsaturated carbon chain having at least two carbon atoms, a saturated carbon chain having at least one carbon atom, and an aromatic carbon chain;

a sugar; and

an acid selected from the group comprising nitric acid, sulfuric acid and sulfuric acid partially substituted with an ion of said alkali metal material.

12. The electrochemical cell of claim 11, said anode comprising one of lithium, sodium, and potassium.

13. The electrochemical cell of claim 11, said cathode comprising at least one selected from the group comprising silver oxides, manganese oxides, vanadium oxides, copper silver vanadium oxides, copper oxides, lead oxides, carbon monofluoride, chromium oxides, bismuth-containing oxides, and copper sulfate.

14. The electrochemical cell of claim 11, wherein said electrochemical cell is a non-rechargeable cell.

15. The electrochemical cell of claim 11, wherein said electrochemical cell is a rechargeable cell.

16. The electrochemical cell of claim 11, said liquid electrolyte further comprising an organic solvent.

17. The electrochemical cell of claim 16, said organic solvent comprising at least one selected from the group comprising diethyl carbonate, dimethylcarbonate, butylene carbonate, 3-methyl-2-oxazolidone, sulfolane, tetrahydrofuran, methyl-substituted tetrahydrofuran, 1,3-dioxolane, propylene carbonate (PC), ethylene carbonate, gamma-butyrolactone, ethylene glycol sulfite, dimethylsulfite, dimethyl sulfoxide, dimethoxyethane, dimethyl isoxazole, dioxane, ethyl methyl carbonate, diglyme, and methyl formate.

18. The electrochemical cell of claim 11, said liquid electrolyte further comprising an alkali metal salt.

19. The electrochemical cell of claim 11, wherein said tautomer comprise one selected from the group comprising nitromethane, urea, ketones, carbonyls, imines, enamines, nitrosos functional groups, oxime functional groups, nitros functional groups, aci-nitro functional groups, nitriles, keto-alcohols, hemiketals, keto-acids, and lactols.

20. The electrochemical cell of claim 19, wherein said tautomer is a carbonyl selected from the group comprising carboxylic acid, carboxylic diacid, and salts thereof.

21. The electrochemical cell of claim 11, wherein said alcohol comprises a polyol.

22. The electrochemical cell of claim 11, wherein said sugar comprises one selected from the group comprising glucose, sucrose, and fructose.

23. The electrochemical cell of claim 11, wherein the additive is present in the liquid electrolyte in the range of about 0.001 to about 0.4 M.

24. An implantable medical device comprising an electrochemical cell, said electrochemical cell comprising an anode formed of an alkali metal material, a cathode, and a liquid electrolyte operatively associated with the anode and the cathode, said liquid electrolyte comprising an additive comprising at least one selected from the group comprising:

a tautomer;

an alcohol having the formula R—

OH, where R is one selected from the group comprising an unsaturated carbon chain having at least two carbon atoms, a saturated carbon chain having at least one carbon atom, and an aromatic carbon chain;

a sugar; and

an acid selected from the group comprising nitric acid, sulfuric acid and sulfuric acid partially substituted with an ion of said alkali metal material.

25. The implantable medical device of claim 24, said anode comprising one of lithium, sodium, and potassium.

26. The implantable medical device of claim 24, said cathode comprising at least one selected from the group comprising silver oxides, manganese oxides, vanadium oxides, copper silver vanadium oxides, copper oxides, lead oxides, carbon monofluoride, chromium oxides, bismuth-containing oxides, and copper sulfate.

27. The implantable medical device of claim 24, wherein said electrochemical cell is a non-rechargeable cell.

28. The implantable medical device of claim 24, wherein said electrochemical cell is a rechargeable cell.

29. The implantable medical device of claim 24, said liquid electrolyte further comprising an organic solvent.

30. The implantable medical device of claim 29, said organic solvent comprising at least one selected from the group comprising diethyl carbonate, dimethylcarbonate, butylene carbonate, 3-methyl-2-oxazolidone, sulfolane, tetrahydrofuran, methyl-substituted tetrahydrofuran, 1,3-dioxolane, propylene carbonate (PC), ethylene carbonate, gamma-butyrolactone, ethylene glycol sulfite, dimethylsulfite, dimethyl sulfoxide, dimethoxyethane, dimethyl isoxazole, dioxane, ethyl methyl carbonate, diglyme, and methyl formate.

31. The implantable medical device of claim 24, said liquid electrolyte further comprising an alkali metal salt.

32. The implantable medical device of claim 24, wherein said tautomer comprise one selected from the group comprising nitromethane, urea, ketones, carbonyls, imines, enamines, nitrosos functional groups, oxime functional groups, nitros functional groups, aci-nitro functional groups, nitriles, keto-alcohols, hemiketals, keto-acids, and lactols.

33. The implantable medical device of claim 32, wherein said tautomer is a carbonyl selected from the group comprising carboxylic acid, carboxylic diacid, and salts thereof.

34. The implantable medical device of claim 24, wherein said alcohol comprises a polyol.

35. The implantable medical device of claim 24, wherein said sugar comprises one selected from the group comprising glucose, sucrose, and fructose.

36. The implantable medical device of claim 24, wherein the additive is present in the liquid electrolyte in the range of about 0.001 to about 0.4 M.