Claims
- 1. An electrochemical cell, which comprises:
a) an anode of an alkali metal; b) a cathode of one of a first cathode active material having a relatively low energy density but a relatively high rate capability and a second cathode active material having a relatively high energy density but a relatively low rate capability contacted to outer major sides of a first and a second cathode current collectors, and the other of the fist and second cathode active materials contacted to inner major sides of the first and second cathode current collectors; and c) a nonaqueous electrolyte activating the anode and the cathode.
- 2. The electrochemical cell of claim 1 wherein the first and second current collectors each have a thickness of from about 0.001 inches to about 0.002 inches.
- 3. The electrochemical cell of claim 2 wherein the first and second current collector have the same of different thicknesses.
- 4. The electrochemical cell of claim 1 wherein the first cathode active material is selected from the group consisting of SVO, CSVO, V2O5, MnO2, LiCoO2, LiNiO2, LiMnO2, CuO2, TiS2, Cu2S, FeS, FeS2, copper vanadium oxide, and mixtures thereof.
- 5. The electrochemical cell of claim 1 wherein the second cathode active material is selected from the group consisting of CFx, Ag2O, Ag2O2, CuF, Ag2CrO4, MnO2, SVO, and mixtures thereof.
- 6. The electrochemical cell of claim 1 wherein the first and second cathode current collectors are selected from the group consisting of stainless steel, titanium, tantalum, platinum, aluminum, gold and nickel.
- 7. The electrochemical cell of claim 1 wherein the first and second cathode current collectors are titanium having a graphite/carbon material coated thereon.
- 8. The electrochemical cell of claim 1 wherein the anode is lithium, the first cathode active material is SVO contacted to the outer major sides of the first and second current collectors, and the second cathode active material is CFx contacted to the inner major side of the first and second current collectors.
- 9. The electrochemical cell of claim 1 wherein the alkali metal is in the form of at least one plate contacted to an anode current collector.
- 10. The electrochemical cell of claim 1 wherein the first and the second cathode active materials are connected to a common terminal insulated from a casing for the cell.
- 11. The electrochemical cell of claim 1 wherein the electrolyte has a first solvent selected from an ester, a linear ether, a cyclic ether, a dialkyl carbonate, and mixtures thereof, and a second solvent selected from a cyclic carbonate, a cyclic ester, a cyclic amide, and mixtures thereof.
- 12. The electrochemical cell of claim 11 wherein the first solvent is selected from the group consisting of tetrahydrofuran, methyl acetate, diglyme, trigylme, tetragylme, dimethyl carbonate, 1,2-dimethoxyethane, 1,2-diethoxyethane, 1-ethoxy, 2-methoxyethane, ethyl methyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, diethyl carbonate, dipropyl carbonate, and mixtures thereof, and the second solvent is selected from the group consisting of propylene carbonate, ethylene carbonate, butylene carbonate, acetonitrile, dimethyl sulfoxide, dimethyl, formamide, dimethyl acetamide, γ-valerolactone, γ-butyrolactone, N-methyl-2-pyrrolidone, and mixtures thereof.
- 13. The electrochemical cell of claim 1 wherein the electrolyte includes a lithium salt selected from the group consisting of LiPF6, LiBF4, LiAsF6, LiSbF6, LiClO4, LiO2, LiAlCl4, LiGaCl4, LiC(SO2CF3)3, LiN(SO2CF3)2, LiSCN, LiO3SCF3, LiC6F5SO3, LiO2CCF3, LiSO6F, LiB(C6H5)4, LiCF3SO3, and mixtures thereof.
- 14. An electrochemical cell, which comprises:
a) an anode comprising lithium; b) a cathode of silver vanadium oxide contacted to outer major sides of a first and second cathode current collectors and fluorinated carbon contacted to inner major sides of the first and second cathode current collectors; and c) a nonaqueous electrolyte activating the anode and the cathode.
- 15. The electrochemical cell of claim 14 wherein the first and second current collectors each have a thickness of from about 0.001 inches to about 0.002 inches.
- 16. The electrochemical cell of claim 14 wherein the first and second current collector have the same of different thicknesses.
- 17. The electrochemical cell of claim 14 wherein the first and second current collectors are selected from the group consisting of stainless steel, titanium, tantalum, platinum, aluminum, gold, nickel, and alloys thereof.
- 18. A method powering an implantable medical device, comprising the steps of:
a) providing the medical device; b) providing an electrochemical cell comprising the steps of:
i) providing an anode of an alkali metal; ii) providing a cathode of a first cathode active material having a relatively low energy density but a relatively high rate capability contacted to outer major sides of a first and a second cathode current collectors and a second cathode active material having a relatively high energy density but a relatively low rate capability contacted to inner major sides of the first and second cathode current collectors; and iii) activating the anode and cathode with a nonaqueous; and c) electrically connecting the electrochemical cell to the medical device.
- 19. The method of claim 18 including providing the first and second current collectors each have a thickness of from about 0.001 inches to about 0.002 inches.
- 20. The method of claim 18 including providing the first and second current collector have the same of different thicknesses.
- 21. The method of claim 18 including connecting the first and second cathode current collectors to a common terminal.
- 22. The method of claim 18 including selecting the first cathode active material from the group consisting of SVO, CSVO, V2O5, MnO2, LiCoO2, LiNiO2, LiMnO2, CuO2, TiS2, Cu2S, FeS, FeS2, copper vanadium oxide and mixtures thereof.
- 23. The method of claim 18 including selecting the second cathode active material from the group consisting of CFx, Ag2O, Ag2O2, CuF, Ag2CrO4, MnO2, SVO, and mixtures thereof.
- 24. The method of claim 18 wherein the anode is lithium, the first cathode active material is SVO, and the second cathode active material is CFx.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority based on provisional application Serial No. 60/349,678, filed Jan. 17, 2002.
Provisional Applications (1)
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Number |
Date |
Country |
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60349678 |
Jan 2002 |
US |