Claims
- 1-41. (Canceled)
- 42. A method for providing a capacitor comprising the steps of:
providing a tantalum anode; providing a cathode; activating said anode and said cathode with an electrolyte comprising:
about 35-60%, by weight water; about 10-55%, by weight organic solvent; about 0.05 to 30%, by weight, at least one acid selected from sulphuric, boric acid and phosphorus oxy acid; wherein said electrolyte has a pH below about 5 and a freezing point below about −30° C.
- 43. A method according to claim 42 wherein said acid comprises sulphuric acid and at least one acid selected from boric acid and phosphorus oxy acid.
- 44. A method according to claim 43 wherein said acid comprises sulphuric acid, boric acid and phosphorus oxy acid.
- 45. A method according to claim 44 wherein said electrolytic solution comprises: about 0.05 to 10%, by weight, sulphuric acid;
about 0.05 to 10%, by weight, boric acid; and about 0.05 to 10%, by weight, phosphorus oxy acid.
- 46. A method according to claim 42 wherein said solvent is selected from a group consisting of glycerol, 1,3-propane diol; 2-methyl-1,3-propane diol; propylene glycol; polyethylene glycol monomethyl ether; N-alkyl-2-pyrrolidone and diethylene glycol.
- 47. A method according to claim 46 wherein said solvent is glycerol.
- 48. A method according to claim 46 wherein said solvent is 1,3-propane diol.
- 49. A method according to claim 46 wherein said solvent is 2-methyl-1,3-propane diol.
- 50. A method according to claim 46 wherein said solvent is propylene glycol.
- 51. A method according to claim 46 wherein said solvent is polyethylene glycol monomethyl ether.
- 52. A method according to claim 42 wherein said phosphorus oxy acid is orthophosphoric acid.
- 53. A method according to claim 42 wherein said phosphorus oxy acid is phosphorous acid.
- 54. A method according to claim 46 wherein said cathode is a conductive metal provided with a semiconductive or metal-like conductive coating.
- 55. A method according to claim 54 wherein said cathode is at least one element chosen from a group consisting of an oxide, a nitride, a carbide of a metal or an activated carbon.
- 56. A method according to claim 55 wherein said cathode comprises a metal selected from a group consisting of tantalum, titanium, nickel, iridium, platinum, palladium, gold, silver, cobalt, molybdenum, ruthenium, manganese, tungsten, iron, zirconium, hafnium, rhodium, vanadium, osmium and niobium.
- 57. A method according to claim 56 wherein when said acid comprises sulphuric acid, sufficient buffering material is added to raise the pH to a level sufficient to avoid dissolution of components of manufacture of said capacitor.
- 58. A method according to claim 54 wherein said cathode comprises a porous ruthenium oxide film provided on a titanium substrate.
- 59. A method according to claim 42 wherein said electrolyte has a pH of less than about 4.
- 60. A capacitor prepared by the method according to claim 42.
- 61-64. (canceled)
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application is a divisional application of U.S. patent application Ser. No. 10/449,440 filed May 20, 2003 which is pending.
Divisions (1)
|
Number |
Date |
Country |
Parent |
10449440 |
May 2003 |
US |
Child |
10826606 |
Apr 2004 |
US |