US4486400A
Expired / Lapsed
US
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Vanadium oxide synthesis
Assignee: Combustion Engineering Inc
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Filing: 1983-05-25
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Granted: 1984-12-04
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Expires: 2003-05-25
Abstract
Abstract A process for preparing stoichiometric V 6 O 13 usable as the cathode active material in high energy density primary and secondary batteries comprises the steps of: (a) raising the temperature of ammonium metavanadate up to a temperature of from about 350° C. to about 400° C. over an approximately 2 hour time period in a dynamic atmosphere of nitrogen gas to thermally decompose the ammonium metavanadate into a nonstoichiometric V 6 O 13 product while evolving successively ammonia, water vapor and oxygen; (b) holding the nonstoichiometric V 6 O 13 product at said temperature of from about 350° C. to about 400° C. for about 4 hours in said dynamic atmosphere of nitrogen gas; (c) heating the nonstoichiometric V 6 O 13 product at a temperature of from about 400° C. to about 500° C. for from about 8 hours to about 12 hours in a dynamic atmosphere of a gaseous mixture having a composition giving an oxygen partial pressure equal to the oxygen partial pressure over stoichiometric V 6 O 13 at said temperature to form stoichiometric V 6 O 13 ; and (d) cooling the stoichiometric V 6 O 13 to room temperature in said dynamic atmosphere of said gaseous mixture.
Inventors
- 👤 Brian Riley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:41
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; C; C01; C01G; C01G31/00; C01G31/02; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/12; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
245 words
A process for preparing stoichiometric V 6 O 13 which comprises the steps of: (a) raising the temperature of ammonium metavanadate up to a temperature of from about 350° C. to about 400° C. over an approximately 2 hour time period in a dynamic atmosphere of nitrogen gas to thermally decompose the ammonium metavanadate into a nonstoichiometric V 6 O 13 product while evolving successively ammonia, water vapor and oxygen; (b) holding the nonstoichiometric V 6 O 13 product at said temperature of from about 350° C. to about 400° C. for about 4 hours in said dynamic atmosphere of nitrogen gas; (c) heating the nonstoichiometric V 6 O 13 product at a temperature of from about 400° C. to about 500° C. for from about 8 hours to about 12 hours in a dynamic atmosphere of a gaseous mixture having a composition giving an oxygen partial pressure equal to the oxygen partial pressure over stoichiometric V 6 O 13 at said temperature to form stoichiometric V 6 O 13 , said gaseous mixture being composed of from about 2% to about 0.2% by volume of carbon monoxide and from about 98% to about 99.8% by volume of carbon dioxide or composed of from about 10% to about 1% by volume of hydrogen and from about 90% to about 99% by volume of water vapor; and (d) cooling the stoichiometric V 6 O 13 to room temperature in said dynamic atmosphere of said gaseous mixture.
Claim 2
Dependent Claim
245 words
A process for preparing stoichiometric V 6 O 13 which comprises the steps of: (a) raising the temperature of ammonium metavanadate up to a temperature of from about 350° C. to about 400° C. over an approximately 2 hour time period in a dynamic atmosphere of nitrogen gas to thermally decompose the ammonium metavanadate into a nonstoichiometric V 6 O 13 product while evolving successively ammonia, water vapor and oxygen; (b) holding the nonstoichiometric V 6 O 13 product at said temperature of from about 350° C. to about 400° C. for about 4 hours in said dynamic atmosphere of nitrogen gas; (c) heating the nonstoichiometric V 6 O 13 product at a temperature of from about 400° C. to about 500° C. for from about 8 hours to about 12 hours in a dynamic atmosphere of a gaseous mixture having a composition giving an oxygen partial pressure equal to the oxygen partial pressure over stoichiometric V 6 O 13 at said temperature to form stoichiometric V 6 O 13 , said gaseous mixture being composed of from about 2% to about 0.2% by volume of carbon monoxide and from about 98% to about 99.8% by volume of carbon dioxide or composed of from about 10% to about 1% by volume of hydrogen and from about 90% to about 99% by volume of water vapor; and (d) cooling the stoichiometric V 6 O 13 to room temperature in said dynamic atmosphere of said gaseous mixture.
Claim 3
Dependent Claim
48 words
A process according to claim 1, wherein the nonstoichiometric V 6 O 13 product is heated in step (c) at a temperature of about 400° C. and said gaseous mixture is composed of about 2% by volume of carbon monoxide and about 98% by volume of carbon dioxide.
Claim 4
Dependent Claim
48 words
A process according to claim 1, wherein the nonstoichiometric V 6 O 13 product is heated in step (c) at a temperature of about 450° C. and said gaseous mixture is composed of about 0.65% by volume of carbon monoxide and about 99.35% by volume of carbon dioxide.
Claim 5
Dependent Claim
48 words
A process according to claim 1, wherein the nonstoichiometric V 6 O 13 product is heated in step (c) at a temperature of about 500° C. and said gaseous mixture is composed of about 0.2% by volume of carbon monoxide and about 99.8% by volume of carbon dioxide.
Claim 6
Dependent Claim
47 words
A process according to claim 1, wherein the nonstoichiometric V 6 O 13 product is heated in step (c) at a temperature of about 400° C. and said gaseous mixture is composed of about 10% by volume of hydrogen and about 90% by volume of water vapor.
Claim 7
Dependent Claim
47 words
A process according to claim 1, wherein the nonstoichiometric V 6 O 13 product is heated in step (c) at a temperature of about 450° C. and said gaseous mixture is composed of about 3.5% by volume of hydrogen and about 96.5% by volume of water vapor.
Claim 8
Dependent Claim
47 words
A process according to claim 1, wherein the nonstoichiometric V 6 O 13 product is heated in step (c) at a temperature of about 500° C. and said gaseous mixture is composed of about 1% by volume of hydrogen and about 99% by volume of water vapor.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |