US5328782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treated porous carbon black cathode and lithium based, nonaqueous electrolyte cell including said treated cathode
Assignee: United States Department of the Army
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Filing: 1992-10-13
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Granted: 1994-07-12
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Expires: 2012-10-13
Abstract
Abstract A porous carbon black cathode is treated by brief exposure to a low press, room temperature gas plasma. The treated cathode is suitable for inclusion in a lithium based, nonaqueous electrolyte cell.
Inventors
- 👤 Michael Binder
- 👤 Robert J. Mammone
- 👤 William L. Wade, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:38
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M4/00; H01M4/86; H01M4/96; H01M6/50; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
74 words
A lithium/sulfur dioxide cell including a porous carbon black cathode of about 90 percent carbon black and about 10 percent Teflon® wherein the cathode is plasma gas treated with a gas plasma selected from the group consisting of O 2 , NH 3 and GF 4 /O 2 for about 4 minutes at a pressure of about 20 to 250 mTorr and at room temperature prior to inclusion of the cathode in the cell.
Claim 2
Dependent Claim
74 words
A lithium/sulfur dioxide cell including a porous carbon black cathode of about 90 percent carbon black and about 10 percent Teflon® wherein the cathode is plasma gas treated with a gas plasma selected from the group consisting of O 2 , NH 3 and GF 4 /O 2 for about 4 minutes at a pressure of about 20 to 250 mTorr and at room temperature prior to inclusion of the cathode in the cell.
Claim 3
Dependent Claim
14 words
A lithium/sulfur dioxide cell according to claim 1 wherein the gas plasma is ammonia.
Claim 4
Dependent Claim
14 words
A lithium/sulfur dioxide cell according to claim 1 wherein the gas plasma is oxygen.
Claim 5
Dependent Claim
18 words
A lithium/sulfur dioxide cell according to claim 1 wherein the gas plasma is CF 4 /O 2 .
Claim 6
Dependent Claim
35 words
A lithium/sulfur dioxide cell according to claim 1 wherein the lithium/sulfur dioxide cell including the gas plasma treated cathode is stored for about 3 weeks at room temperature prior to the testing of the cell.
Claim 7
Dependent Claim
77 words
A porous carbon black cathode of about 90 percent carbon black and about 10 percent Teflon® that has been treated by brief exposure to a low pressure, room temperature gas plasma selected from the group consisting of O 2 , NH 2 , and CF 4 /O 2 for about 4 minutes at a pressure of about 20 to 250 mTorr and at room temperature said treated cathode being suitable for inclusion in a lithium/sulfur dioxide cell.
Claim 8
Dependent Claim
77 words
A porous carbon black cathode of about 90 percent carbon black and about 10 percent Teflon® that has been treated by brief exposure to a low pressure, room temperature gas plasma selected from the group consisting of O 2 , NH 2 , and CF 4 /O 2 for about 4 minutes at a pressure of about 20 to 250 mTorr and at room temperature said treated cathode being suitable for inclusion in a lithium/sulfur dioxide cell.
Claim 9
Dependent Claim
16 words
A treated porous carbon black cathode according to claim 6 wherein the gas plasma is ammonia.
Claim 10
Dependent Claim
16 words
A treated porous carbon black cathode according to claim 6 wherein the gas plasma is oxygen.
Claim 11
Dependent Claim
20 words
A treated porous carbon black cathode according to claim 6 wherein the gas plasma is CF 4 /O 2 .
Claim 12
Dependent Claim
22 words
A treated thick porous carbon black cathode according to claim 1 wherein the lithium based cell is a Li/SO 2 cell. cell.
References Cited (Backward Citations)
JPS56145670A
Cited
US4615959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-11 | 1998-01-10 | 1998-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-11 | 2002-01-10 | 2002-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-11 | 2006-01-10 | 2006-07-12 | $7700.00 | Window Closed / Lapsed |