Patent JPS5482354A successfully refreshed from Google Patents.
US4383014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Additive for iron disulfide cathodes used in thermal batteries
Assignee: United States Department of Energy
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Filing: 1982-03-23
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Granted: 1983-05-10
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Expires: 2002-03-23
Abstract
Abstract The invention comprises thermal batteries employing an FeS 2 depolarizer, i.e. cathode material, and the depolarizer itself. A minor amount of CaSi 2 preferably, 1-3% by weight is provided as an additive in the FeS 2 depolarizer to eliminate the voltage transient (spike) which normally occurs upon activation of batteries of this type. The amount of FeS 2 by weight generally comprises 64-90%.
Inventors
- 👤 James R. Armijo
- 👤 Jimmie Q. Searcy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:09
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/58; H01M4/581; H01M6/00; H01M6/30; H01M6/36
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
96 words
In a depolarized thermal battery having a plurality of single cell pellets arranged in a stack, with each single cell comprising a heat pellet and, two current collectors having an anode pellet, a separator pellet, and a cathode pellet comprised of FeS 2 and a solid electrolyte, sandwiched therebetween, said thermal battery further including means for activating the battery by melting the electrolyte, the improvement wherein the depolarizer comprises an amount of particulate CaSi 2 effective to substantially eliminate the occurrence of a voltage spike during the initial period of activation of the depolarized thermal battery.
Claim 2
Dependent Claim
96 words
In a depolarized thermal battery having a plurality of single cell pellets arranged in a stack, with each single cell comprising a heat pellet and, two current collectors having an anode pellet, a separator pellet, and a cathode pellet comprised of FeS 2 and a solid electrolyte, sandwiched therebetween, said thermal battery further including means for activating the battery by melting the electrolyte, the improvement wherein the depolarizer comprises an amount of particulate CaSi 2 effective to substantially eliminate the occurrence of a voltage spike during the initial period of activation of the depolarized thermal battery.
Claim 3
Dependent Claim
20 words
A thermal battery as in claim 1 wherein the amount of CaSi 2 in the depolarizer is 1-3% by weight.
Claim 4
Dependent Claim
23 words
A thermal battery as in claim 2 wherein the amount of CaSi 2 in the depolarizer is no more than 2.5% by weight.
Claim 5
Dependent Claim
21 words
A thermal battery as in claim 2 wherein the amount of CaSi 2 in the depolarizer is about 2% by weight.
Claim 6
Dependent Claim
20 words
A thermal battery as in claim 2 wherein the amount of FeS 2 in the depolarizer is 64-90% by weight.
Claim 7
Dependent Claim
21 words
A thermal battery as in claim 5 wherein the amount of FeS 2 in the depolarizer is about 75% by weight.
Claim 8
Dependent Claim
36 words
A thermal battery as in claim 5 wherein the particle size of the CaSi 2 in the depolarizer is -60 mesh (U.S. std.) and the particle size of the FeS 2 is -40 mesh (U.S. std.).
Claim 9
Dependent Claim
32 words
A thermal battery as in claim 7 wherein the particle size of the CaSi 2 is -60/+100 mesh (U.S. std.) and particle size of the FeS 2 is -325 mesh (U.S. std.).
Claim 10
Dependent Claim
35 words
A thermal battery as in claim 8 wherein the amount of FeS 2 in the depolarizer is at least 75% by weight, and the amount of CaSi 2 in the depolarizer is 2% by weight.
Claim 11
Dependent Claim
20 words
A thermal battery as in claim 9 wherein the amount of FeS 2 in the depolarizer is 90% by weight.
Claim 12
Dependent Claim
65 words
In an FeS 2 depolarizer useful in an LiSi/FeS 2 thermal battery of the type having a solid electrolyte and which is activated by heating and melting of the electrolyte, the improvement wherein the depolarizer contains an effective amount of CaSi 2 whereby when said improved FeS 2 depolarizer is used in said thermal battery the initial voltage transient occurring upon activation is substantially eliminated.
Claim 13
Dependent Claim
65 words
In an FeS 2 depolarizer useful in an LiSi/FeS 2 thermal battery of the type having a solid electrolyte and which is activated by heating and melting of the electrolyte, the improvement wherein the depolarizer contains an effective amount of CaSi 2 whereby when said improved FeS 2 depolarizer is used in said thermal battery the initial voltage transient occurring upon activation is substantially eliminated.
Claim 14
Dependent Claim
30 words
A depolarizer as in claim 11 wherein the amount of FeS 2 in the depolarizer comprises 64-90% by weight, and the amount of CaSi 2 additive comprises 1-3% by weight.
References Cited (Backward Citations)
US4018970A
Cited
US4163829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-09 | 1986-11-08 | 1987-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-09 | 1990-11-08 | 1991-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-09 | 1994-11-08 | 1995-05-10 | $7700.00 | Window Closed / Lapsed |