US4526844A
Expired / Lapsed
US
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Rhombohedral nasicon compound and battery
Assignee: Northrop Grumman Corp
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Filing: 1983-04-14
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Granted: 1985-07-02
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Expires: 2003-04-14
Abstract
Abstract Disclosed is a nasicon compound and a method of making it. The nasicon compound is rhombohedral at room temperature and has the general formula M1+x+O.02y+0.04zM'2-0.02(y+z)M''0.02yM'''0.02zM''''xM'''''3-xO12 where M is selected from lithium, sodium, calcium, and silver, M' is selected from zirconium, titanium or hafnium, M'' is selected from yttrium, scandium or lanthanum, M''' is selected from magnesium, calcium, strontium or barium, M'''' is selected from silicon and germanium, M''''' is selected from phosphorous and arsenic, x is about 1.6 to about 2.2, y is about 0 to about 15, and z is about 0 to about 15. The preferred compound is Na1+xZr2SixP3-xO12. A sodium sulfur battery using the nasicon compound is also disclosed.
Inventors
- 👤 Bulent E. Yoldas
- 👤 Isabel K. Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:37
CPC Classifications
C; C01; C01G; C01G28/00; C01G28/02; C01G28/026; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/45; C01B33/00; C01B33/20; H; H01; H01M; H01M10/00; H01M10/36; H01M10/39; H01M10/3909; H01M10/3918; H01M6/00; H01M6/14; H01M6/18; H01M6/185; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2002/74; C01P2006/00; C01P2006/40; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
137 words
A nasicon compound which is rhombohedral at room temperature, having the general formula M.sub.1+x+0.02y+0.04z M'.sub.2-0.02(y+z) M".sub.0.02y M'".sub.0.02z M"".sub.x M'"".sub.3-x O.sub.12 where M is selected from the group consisting of Li, Na, K, Ag, and mixtures thereof, M' is selected from the group consisting of Zr, Ti, Hf, and mixtures thereof, M" is selected from the group consisting of 0 to 15 molar % of Y, Sc, La, and mixtures thereof, M'" is selected from the group consisting of 0 to 15 molar % of Mg, Ca, Sr, Ba, and mixtures thereof, M"" is selected from the group consisting of Si, Ge, and mixtures thereof, M'"" is selected from the group consisting of P, As, and mixtures thereof, x is about 1.9 to about 2.2, y is 0 to about 15 and z is 0 to about 15.
Claim 2
Dependent Claim
137 words
A nasicon compound which is rhombohedral at room temperature, having the general formula M.sub.1+x+0.02y+0.04z M'.sub.2-0.02(y+z) M".sub.0.02y M'".sub.0.02z M"".sub.x M'"".sub.3-x O.sub.12 where M is selected from the group consisting of Li, Na, K, Ag, and mixtures thereof, M' is selected from the group consisting of Zr, Ti, Hf, and mixtures thereof, M" is selected from the group consisting of 0 to 15 molar % of Y, Sc, La, and mixtures thereof, M'" is selected from the group consisting of 0 to 15 molar % of Mg, Ca, Sr, Ba, and mixtures thereof, M"" is selected from the group consisting of Si, Ge, and mixtures thereof, M'"" is selected from the group consisting of P, As, and mixtures thereof, x is about 1.9 to about 2.2, y is 0 to about 15 and z is 0 to about 15.
Claim 3
Dependent Claim
11 words
A nasicon compound according to claim 1 wherein M is Na.
Claim 4
Dependent Claim
11 words
A nasicon compound according to claim 1 wherein M' is Zr.
Claim 5
Dependent Claim
11 words
A nasicon compound according to claim 1 wherein M"" is Si.
Claim 6
Dependent Claim
11 words
A nasicon compound according to claim 1 wherein M'"" is P.
Claim 7
Dependent Claim
15 words
A nasicon compound according to claim 1 wherein x is about 1.9 to about 2.1.
Claim 8
Dependent Claim
14 words
A nasicon compound according to claim 1 in the form of a polycrystalline ceramic.
Claim 9
Dependent Claim
26 words
A nasicon compound which is rhombohedral at room temperature, having the general formula Na.sub.1+x Zr.sub.2 Si.sub.x P.sub.3-x O.sub.12 where x is about 1.9 to about 2.2.
Claim 10
Dependent Claim
26 words
A nasicon compound which is rhombohedral at room temperature, having the general formula Na.sub.1+x Zr.sub.2 Si.sub.x P.sub.3-x O.sub.12 where x is about 1.9 to about 2.2.
Claim 11
Dependent Claim
15 words
A nasicon compound according to claim 8 wherein x is about 1.9 to about 2.1.
Claim 12
Dependent Claim
14 words
A nasicon compound according to claim 8 in the form of a polycrystalline ceramic.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |