Claims
- 1. An electrochemical cell, which comprises:
a) an anode comprising lithium; b) a cathode comprising a solid cathode active material contacted to a conductive current collector comprising titanium coated with one of gold, iridium, palladium, platinum, rhodium and ruthenium, and mixtures thereof; and c) an electrolyte activating the anode and the cathode.
- 2. The electrochemical cell of claim 1 wherein the coating has a thickness of about 20 μinches to about 100 μinches.
- 3. The electrochemical cell of claim 1 wherein the cathode active material comprises fluorinated carbon.
- 4. The electrochemical cell of claim 3 wherein the lithium and the fluorinated carbon are present in an anode-to-cathode capacity ratio in a range of about 1.03 to about 1.05 (based on a gram amount of active material) and wherein the electrolyte and the fluorinated carbon are present in an electrolyte-to-cathode weight ratio of about 0.938 to about 0.73 (based on a gram amount of cathode active material).
- 5. An electrochemical cell, which comprises:
a) an anode comprising lithium; b) a cathode comprising a cathode active material selected from the group consisting of fluorinated carbon, silver vanadium oxide, copper-silver-vanadium oxide, manganese dioxide, lithium cobalt oxide, lithium nickel oxide, copper oxide, titanium disulfide, copper sulfide, iron sulfide, iron disulfide, copper vanadium oxide, and mixtures thereof contacted to a conductive current collector comprising titanium coated with one of gold, iridium, palladium, platinum, rhodium and ruthenium, and mixtures thereof; and c) an electrolyte activating the anode and the cathode.
- 6. The electrochemical cell of claim 5 wherein the cathode active material is fluorinated carbon present in an anode-to-cathode capacity ratio in a range of about 1.03 to about 1.05 (based on a gram amount of active material) and wherein the electrolyte and the fluorinated carbon are present in an electrolyte-to-cathode weight ratio of about 0.938 to about 0.73 (based on a gram amount of cathode active material).
- 7. The electrochemical cell of claim 5 wherein the coating has a thickness of about 20 μinches to about 100 μinches.
- 8. The electrochemical cell of claim 5 wherein the cathode active material is present in the cathode at an amount of about 80% to about 98%, by weight, remainder being at least one of a binder material and a conductive additive.
- 9. The electrochemical cell of claim 8 wherein the binder material is a fluoro-resin powder.
- 10. The electrochemical cell of claim 8 wherein the conductive additive is selected from the group consisting of carbon, graphite power, acetylene black and a metallic powder selected from the group consisting of titanium, aluminum, nickel and stainless steel, and mixtures thereof.
- 11. The electrochemical cell of claim 5 wherein the anode further includes a current collector selected from the group consisting of titanium, nickel, copper, tungsten and tantalum.
- 12. The electrochemical cell of claim 5 wherein the electrolyte comprises 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.
- 13. The electrochemical cell of claim 5 wherein the electrolyte comprises at least one organic solvent 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, propylene carbonate, ethylene carbonate, butylene carbonate, acetonitrile, dimethyl sulfoxide, dimethyl formamide, dimethyl acetamide, γ-valerolactone, γ-butyrolactone, N-methyl-pyrrolidinone, and mixtures thereof.
- 14. The electrochemical cell of claim 5 housed in a conductive casing comprising a material selected from the group consisting of titanium, stainless steel, milled steel, nickel, nickel-plated milled steel and aluminum.
- 15. The electrochemical cell of claim 5 wherein the anode comprises lithium contacted to a nickel current collector and the cathode comprises fluorinated cathode active material contacted to a titanium current collector coated with either gold, iridium, palladium, platinum, rhodium and ruthenium in a thickness of about 50 μinches and wherein the anode and the cathode are activated with the electrolyte comprising LiBF4 in γ-butyrolactone.
- 16. The electrochemical cell of claim 5 wherein the gold, iridium, palladium, platinum, rhodium and ruthenium are characterized as having been sputter coated to the current collector.
- 17. A method for providing an electrochemical cell, comprising the steps of:
a) providing a casing; b) providing an anode comprising lithium; c) providing a cathode active material selected from the group consisting of fluorinated carbon, silver vanadium oxide, copper silver vanadium oxide, manganese dioxide, lithium cobalt oxide, lithium nickel oxide, copper oxide, titanium disulfide, copper sulfide, iron sulfide, iron disulfide, copper vanadium oxide, and mixtures thereof; d) coating a titanium current collector with one of gold, iridium, palladium, platinum, rhodium and ruthenium, and mixtures thereof; e) contacting the cathode active material to the coated titanium current collector to provide a cathode; f) operatively associating the anode with the cathode housed inside the casing; and g) activating the anode and the cathode with an electrolyte filled into the casing.
- 18. The method of claim 17 including providing the cathode active material as fluorinated carbon present in an anode-to-cathode capacity ratio in a range of about 1.03 to about 1.05 (based on a gram amount of active material) and providing the electrolyte and the fluorinated carbon present in an electrolyte-to-cathode weight ratio of about 0.938 to about 0.73 (based on a gram amount of cathode active material).
- 19. The method of claim 17 including providing the coating having a thickness of about 20 μinches to about 100 μinches.
- 20. The method of claim 17 including coating the gold, iridium, palladium, platinum, rhodium and ruthenium on the current collector by a technique selected from the group of sputtering, painting, dipping, air atomization spraying, electrolysis, chemical vapor deposition, physical vapor deposition, ultrasonic air atomization, flame spraying, electrical heating thermal spraying, plasma spraying, and combinations thereof.
- 21. The electrochemical cell of claim 17 wherein the anode further includes a current collector selected from the group consisting of titanium, nickel, copper, tungsten and tantalum.
- 22. The electrochemical cell of claim 17 wherein the anode comprises lithium contacted to a nickel current collector and the cathode comprises fluorinated cathode active material contacted to a titanium current collector coated with one of gold, iridium, palladium, platinum, rhodium, ruthenium, and mixtures thereof and wherein the anode and the cathode are activated with the electrolyte comprising 1.0 M LiBF4 in γ-butyrolactone.
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application claims priority based on U.S. provisional application Serial No. 60/335,353, filed Nov. 2, 2001.
Provisional Applications (1)
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Number |
Date |
Country |
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60335353 |
Nov 2001 |
US |