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Process for preparing a compound using a vanadium oxide derivative for the cathode of a thermal cell
Assignee: SAFT Societe des Accumulateurs Fixes et de Traction SA
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Filing: 1989-05-19
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Granted: 1990-08-28
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Expires: 2009-05-19
Abstract
Abstract A process for preparing a compound using a vanadium oxide derivative for the cathode of a thermal cell. According to the invention, a powdered mixture is produced using vanadium pentoxide, a carbon, and a mixture of alkaline halides; then heat processing is conducted at a temperature ranging from 360 DEG C. to 650 DEG C. for a period ranging from 15 minutes to 2 hours inclusive. A cathode material for a thermal cell is obtained which displays a stable discharge voltage (curve A).
Inventors
- 👤 Jean-Pierre Buchel
- 👤 Gilles Crepy
- 👤 Veronique Danel
- 👤 Anne de Guibert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:16
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/06; H01M4/08; H01M6/00; H01M6/30; H01M6/36; H01M4/36; H01M4/48; H01M4/483; H01M4/62; H01M4/624; H01M4/625; H01M2300/00; H01M2300/0017; H01M2300/0048; H01M2300/0054; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
140 words
A process for preparing a composition based on a vanadium oxide derivative which is suitable for use as a cathode material in a thermal cell, wherein the process comprises: preparing a powdered mixture by combining vanadium pentoxide V 2 O 5 , a carbon ranging from 3 percent to 20 percent inclusive by weight of V 2 O 5 , and a mixture of alkaline halides ranging from 15 percent to 50 percent inclusive by weight of V 2 O 5 ; heat processing the prepared powdered mixture at a temperature which is higher than the melting point of said mixture of halides, wherein said temperature ranges from 365° C. to 650° C. inclusive, for a time period ranging from 15 minutes to 2 hours inclusive to produce a heat processed composition suitable for a cathode of a thermal cell.
Claim 2
Dependent Claim
140 words
A process for preparing a composition based on a vanadium oxide derivative which is suitable for use as a cathode material in a thermal cell, wherein the process comprises: preparing a powdered mixture by combining vanadium pentoxide V 2 O 5 , a carbon ranging from 3 percent to 20 percent inclusive by weight of V 2 O 5 , and a mixture of alkaline halides ranging from 15 percent to 50 percent inclusive by weight of V 2 O 5 ; heat processing the prepared powdered mixture at a temperature which is higher than the melting point of said mixture of halides, wherein said temperature ranges from 365° C. to 650° C. inclusive, for a time period ranging from 15 minutes to 2 hours inclusive to produce a heat processed composition suitable for a cathode of a thermal cell.
Claim 3
Dependent Claim
23 words
A process as claimed in claim 1, wherein said carbon is a gas black, such as carbon black, acetylene black or benzene black.
Claim 4
Dependent Claim
52 words
A process as claimed in claim 1, wherein said mixture of alkaline halides is a mixture of lithium and potassium halides selected from the group consisting of the eutectic LiCl-KCl, mixtures of LiCl-KCl containing from 50 mole percent to 80 mole percent of LiCl, and ternary mixtures of LiCl-LiBr-LiF and of LiCl-LiBr-KBr.
Claim 5
Dependent Claim
32 words
A process as claimed in claim 1 or 2 or 3, wherein the proportion of said carbon ranges from 5 percent to 10 percent by weight of V 2 O 5 inclusive.
Claim 6
Dependent Claim
35 words
A process as claimed in claim 1 or 2 or 3, wherein the proportion of said mixture of alkaline halides ranges from 30 percent to 45 percent by weight of V 2 O 5 inclusive.
Claim 7
Dependent Claim
23 words
A process as claimed in claim 1 or 2 or 3, wherein said processing temperature ranges from 410° C. to 550° C. inclusive.
Claim 8
Dependent Claim
22 words
A process as claimed in claim 6, wherein the duration of said heating step ranges from 1/2 hour to one hour inclusive.
Claim 9
Dependent Claim
134 words
A process for preparing a cathode for a thermal cell, wherein the process comprises: preparing a powdered mixture by combining vanadium pentoxide V 2 O 5 , a carbon ranging from 3 percent to 20 percent inclusive by weight of V 2 O 5 , and a mixture of alkaline halides ranging from 15 percent to 50 percent inclusive by weight of V 2 O 5 ; heating the prepared powdered mixture at a temperature which is higher than the melting point of said mixture of halides, wherein said temperature ranges from 365° C. to 650° C. inclusive, for a time period ranging from 15 minutes to 2 hours inclusive; cooling the heat processed powdered mixture; grinding the cooled mixture to a particle size of less than 100 microns; and pelletizing the ground mixture.
Claim 10
Dependent Claim
134 words
A process for preparing a cathode for a thermal cell, wherein the process comprises: preparing a powdered mixture by combining vanadium pentoxide V 2 O 5 , a carbon ranging from 3 percent to 20 percent inclusive by weight of V 2 O 5 , and a mixture of alkaline halides ranging from 15 percent to 50 percent inclusive by weight of V 2 O 5 ; heating the prepared powdered mixture at a temperature which is higher than the melting point of said mixture of halides, wherein said temperature ranges from 365° C. to 650° C. inclusive, for a time period ranging from 15 minutes to 2 hours inclusive; cooling the heat processed powdered mixture; grinding the cooled mixture to a particle size of less than 100 microns; and pelletizing the ground mixture.
Claim 11
Dependent Claim
166 words
A thermal cell comprising: a cathode prepared by the steps of: preparing a powdered mixture by combining vanadium pentoxide V 2 O 5 , a carbon ranging from 3 percent to 20 percent inclusive by weight of V 2 O 5 , and a mixture of alkaline halides ranging from 15 percent to 50 percent inclusive by weight of V 2 O 5 ; heating the prepared powdered mixture at a temperature which is higher than the melting point of said mixture of halides, wherein said temperature ranges from 365° C. to 650° C. inclusive, for a time period ranging from 15 minutes to 2 hours inclusive; cooling the heat processed powdered mixture; grinding the cooled mixture to a particle size of less than 100 microns; and pelletizing the ground mixture; an anode of lithium or of a lithium alloy selected from the group consisting of compounds of lithium-aluminum, lithium-silicon and lithium-boron; and an electrolyte composed of a binder and of said mixture of alkaline halides.
Claim 12
Dependent Claim
166 words
A thermal cell comprising: a cathode prepared by the steps of: preparing a powdered mixture by combining vanadium pentoxide V 2 O 5 , a carbon ranging from 3 percent to 20 percent inclusive by weight of V 2 O 5 , and a mixture of alkaline halides ranging from 15 percent to 50 percent inclusive by weight of V 2 O 5 ; heating the prepared powdered mixture at a temperature which is higher than the melting point of said mixture of halides, wherein said temperature ranges from 365° C. to 650° C. inclusive, for a time period ranging from 15 minutes to 2 hours inclusive; cooling the heat processed powdered mixture; grinding the cooled mixture to a particle size of less than 100 microns; and pelletizing the ground mixture; an anode of lithium or of a lithium alloy selected from the group consisting of compounds of lithium-aluminum, lithium-silicon and lithium-boron; and an electrolyte composed of a binder and of said mixture of alkaline halides.
Claim 13
Dependent Claim
28 words
A thermal cell as claimed in claim 9, wherein the binder is selected from the group consisting of SiO 2 , MgO, and Al 2 O 3 .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |