Claims
- 1. A polymer electrolyte for electrochemical storage devices comprising cyclic poly(siloxane-g-ethylene oxide) represented by general formula:
- 2. The polymer electrolyte of claim 1 wherein said electrolyte is a liquid comprising cyclic poly(siloxane-g-ethylene oxide) and at least one alkali metal salt.
- 3. The polymer electrolyte of claim 1 wherein said electrolyte is a solid comprising cyclic poly(siloxane-g-ethylene oxide), at least one alkali metal salt and one or more solidifying polymers.
- 4. The polymer electrolyte of claim 3, wherein said one or more solidifying polymers are selected from the group consisting of network forming polymer and solid polymer.
- 5. The polymer electrolyte of claim 3, wherein said one or more solidifying polymers comprises poly(ethylene oxide) dimethacrylate.
- 6. The polymer electrolyte of claim 1 wherein said electrolyte is entrapped inside crosslinked polymer networks.
- 7. The polymer electrolyte of claim 1 wherein said electrolyte is mixed with solid polymers.
- 8. The polymer electrolyte recited in claim 7 wherein said solid polymers comprise at least one solid polymer selected from the group consisting of: polyacrylonitrile (PAN), poly(methyl methacrylate) (PMMA), poly(vinylidene fluoride) (PVdF), poly(vinylidene fluoride-co-hexafluoropropylene), poly(vinyl acetate), polystyrene, and poly(ethylene oxide) (PEO).
- 9. The polymer electrolyte of claim 1, wherein the average molecular weight of the poly(siloxane-g-ethylene oxide) is less than or equal to 20,000 g/mol.
- 10. The polymer electrolyte of claim 1, wherein the dynamic viscosity of the poly(siloxane-g-ethylene oxide) is less than or equal to 10,000 cps.
- 11. The polymer electrolyte of claim 1, further comprising a lithium salt.
- 12. The polymer electrolyte of claim 11, wherein the molar ratio of [EO]/[Li] is 5 to 50.
- 13. The polymer electrolyte of claim 10, wherein the lithium salt comprises at least one lithium salt selected from the group consisting of: LiCIO4, LiBF4, LiAsF6, LiPF6, LiCF3SO3, Li(CF3SO2)2N, Li(CF3SO2)3C, LiN(SO2C2F5)2), lithium alkyl fluorophosphates, lithium oxalatoborate, lithium bis(chelato)borates, LiPF3(C2F5)3, LiPF3(CF3)3, LiB(C2O4)2.
- 14. The polymer electrolyte of claim 13 wherein said lithium bis(chelato)borate has 5 to 10 membered rings.
- 15. The polymer electrolyte of claim 13 wherein said lithium bis(chelato)borates has 5 to 7 membered rings.
- 16. The polymer electrolyte of claim 13, further comprising a network forming polymer.
- 17. The polymer electrolyte of claim 16 wherein said network forming polymer comprises poly(alkylene oxide) dialkyl alkyl acrylates represented by general formula:
- 18. The polymer electrolyte of claim 13, further comprising a solid polymer.
- 19. The polymer electrolyte of claim 18 wherein said solid polymer comprises at least one polymer selected from the group consisting of: polyacrylonitrile (PAN), poly(methyl methacrylate) (PMMA), poly(vinylidene fluoride) (PVdF), poly(vinylidene fluoride-co-hexafluoropropylene), poly(vinyl acetate), polystyrene, and poly(ethylene oxide) (PEO).
- 20. An electrochemical device comprising the polymer electrolyte recited in claim 1.
- 21. The electrochemical device recited in claim 20 wherein said electrochemical device comprises a lithium secondary battery further comprising at least one lithium metal oxide cathode, at least one porous separator and at least one anode.
- 22. The electrochemical device recited in claim 21 wherein said at least one anode comprises at least one material selected from the group consisting of carbon and lithium metal.
- 23. The electrochemical device recited in claim 20 wherein said electrochemical device comprises a capacitor.
- 24. A method for synthesizing cyclic poly(siloxane-g-ethylene oxide) comprising the acts of:
providing tri(ethyleneglycol) monomethyl ether; providing a solvent; providing a catalyst; drying all components; mixing and heating all components; removing said solvent; and removing all volatiles.
- 25. The method recited in claim 24 wherein said catalyst contains boron.
- 26. The method recited in claim 24 wherein said catalyst comprises B(C6F5)3.
- 27. The method recited in claim 24 wherein said catalyst comprises triethylamine.
- 28. The method recited in claim 24 wherein said solvent comprises toluene.
- 29. The method recited in claim 24 wherein said heating is to about 70-75° C.
- 30. The method recited in claim 24 wherein said act of removing all volatiles comprises heating to about 150° C. in a reduced atmospheric pressure of about 0.1 torr.
Priority Claims (7)
Number |
Date |
Country |
Kind |
10104352 |
Mar 2002 |
US |
|
10/167940 |
Jun 2002 |
US |
|
PCT/US03/02127 |
Jan 2003 |
WO |
|
PCT/US03/02128 |
Jan 2003 |
WO |
|
60443892 |
Jan 2003 |
US |
|
60446848 |
Feb 2003 |
US |
|
60451065 |
Feb 2003 |
US |
|
REFERENCE TO PRIOR FILED APPLICATIONS
[0001] This application claims priority to copending provisional application Ser. No. 60/443,892 entitled “Nonaqueous Liquid Electrolyte” filed Jan. 30, 2003; and to PCT/US03/02127, filed Jan. 22, 2003; and to PCT/US03/02128, filed Jan. 22, 2003; and to copending U.S. application Ser. No. 10/167,490 filed Jun. 12, 2002, which is a Continuation-in-Part of co-pending U.S. application Ser. No. 10/104,352, filed Mar. 22, 2002, the disclosure of each of which is incorporated herein in its entirety by reference, including all disclosures submitted therewith.
GOVERNMENT LICENSE RIGHTS
[0002] This invention was made with United States Government support under NIST ATP Award No. 70NANB043022 awarded by the National Institute of Standards and Technology (NIST). The United States Government has certain rights in this invention pursuant to NIST ATP Award No. 70NANB043022 and pursuant to Contract No. W-31-109-ENG-38 between the United States Government and the University of Chicago representing Argonne National Laboratory, and NIST 144 LM01, Subcontract No. AGT DTD 09/09/02.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/US03/08779 |
3/20/2003 |
WO |
|