US4358516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sodium ion conductor, solid electrolyte strengthened with zirconia
Assignee: Boeing North American Inc
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Filing: 1981-10-16
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Granted: 1982-11-09
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Expires: 2001-10-16
Abstract
Abstract Fracture toughness and strength of β-Al 2 O 3 , β"-Al 2 O 3 , and Na 1+x Zr 2 Si x P 3-x O 12 solid electrolytes are increased by incorporating metastable grains of tetragonal ZrO 2 in the structure. The ZrO 2 occupies from 5 to 40% of the volume of the ceramic. To enable retention of the metastable tetragonal structure at room temperature, the ZrO 2 has a grain size less than about 2 μm and has dissolved in it a rare earth oxide such as Y 2 O 3 , CeO 2 , La 2 O 3 and/or Er 2 O 3 .
Inventors
- 👤 Frederick F. Lange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:51
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/36; H01M10/39; H01M10/3909; H01M10/3918; C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/113; H01M6/00; H01M6/14; H01M6/18; H01M6/185; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
143 words
A ceramic comprising: 5 to 40 v/o ZrO 2 in the form of crystalline grains having a diameter less than about 2 μm and having a substantially tetragonal structure; a rare earth oxide selected from the group consisting of Y 2 O 3 , CeO 2 , Er 2 O 3 , and La 2 O 3 , there being at least enough of said rare earth oxide to increase the amount of ZrO 2 having a tetragonal crystal structure, but not enough of said rare earth oxide to form substantial amounts of said ZrO 2 having a cubic crystal structure; and the remainder of said ceramic being substantially a sodium ion conductor solid electrolyte selected from the group consisting of β--Al 2 O 3 , β"--Al 2 O 3 , and Na 1+x Zr 2 Si x P 3-x O 12 .
Claim 2
Dependent Claim
143 words
A ceramic comprising: 5 to 40 v/o ZrO 2 in the form of crystalline grains having a diameter less than about 2 μm and having a substantially tetragonal structure; a rare earth oxide selected from the group consisting of Y 2 O 3 , CeO 2 , Er 2 O 3 , and La 2 O 3 , there being at least enough of said rare earth oxide to increase the amount of ZrO 2 having a tetragonal crystal structure, but not enough of said rare earth oxide to form substantial amounts of said ZrO 2 having a cubic crystal structure; and the remainder of said ceramic being substantially a sodium ion conductor solid electrolyte selected from the group consisting of β--Al 2 O 3 , β"--Al 2 O 3 , and Na 1+x Zr 2 Si x P 3-x O 12 .
Claim 3
Dependent Claim
20 words
The ceramic as claimed in claim 1 wherein said rare earth oxide comprises 3 to 20 m/o CeO 2 .
Claim 4
Dependent Claim
22 words
The ceramic as claimed in claim 1 wherein said rare earth oxide comprises 1 to 4 m/o Er 2 O 3 .
Claim 5
Dependent Claim
22 words
The ceramic as claimed in claim 1 wherein said rare earth oxide comprises 2 to 5 m/o La 2 O 3 .
Claim 6
Dependent Claim
28 words
The ceramic as claimed in claim 1, wherein said sodium ion conductor solid electrolyte comprises a mixture of β--Al 2 O 3 and β"--Al 2 O 3 .
Claim 7
Dependent Claim
50 words
A ceramic comprising: 5 to 40 v/o ZrO 2 in the form of crystalline grains having a diameter less than about 2 μm and having a substantially tetragonal structure; about 2.5 m/o Y 2 O 3 ; and the remainder of said ceramic being substantially β--Al 2 O 3 .
Claim 8
Dependent Claim
50 words
A ceramic comprising: 5 to 40 v/o ZrO 2 in the form of crystalline grains having a diameter less than about 2 μm and having a substantially tetragonal structure; about 2.5 m/o Y 2 O 3 ; and the remainder of said ceramic being substantially β--Al 2 O 3 .
Claim 9
Dependent Claim
50 words
A ceramic comprising: 5 to 40 v/o ZrO 2 in the form of crystalline grains having a diameter less than about 2 μm and having a substantially tetragonal structure; about 2.5 m/o Y 2 O 3 ; and the remainder of said ceramic being substantially β"--Al 2 O 3 .
Claim 10
Dependent Claim
50 words
A ceramic comprising: 5 to 40 v/o ZrO 2 in the form of crystalline grains having a diameter less than about 2 μm and having a substantially tetragonal structure; about 2.5 m/o Y 2 O 3 ; and the remainder of said ceramic being substantially β"--Al 2 O 3 .
Claim 11
Dependent Claim
56 words
A ceramic comprising: 5 to 40 v/o ZrO 2 in the form of crystalline grains having a diameter less than about 2 μm and having a substantially tetragonal structure; about 2.5 m/o Y 2 O 3 ; and the remainder of said ceramic being substantially Na 1+x Zr 2 Si x P 3-x O 12 .
Claim 12
Dependent Claim
56 words
A ceramic comprising: 5 to 40 v/o ZrO 2 in the form of crystalline grains having a diameter less than about 2 μm and having a substantially tetragonal structure; about 2.5 m/o Y 2 O 3 ; and the remainder of said ceramic being substantially Na 1+x Zr 2 Si x P 3-x O 12 .
Claim 13
Dependent Claim
29 words
The ceramic as claimed in claim 8 wherein said Na 1+x Zr 2 Si x P 3-x O 12 comprises Na 3 Zr 2 Si 2 PO 12 .
Claim 14
Dependent Claim
80 words
A ceramic comprising: 5 to 40 v/o ZrO 2 in the form of crystalline grains having a substantially tetragonal structure and having a diameter less than about 2 μm; 2 to 5.5 m/o Y 2 O 3 ; and the remainder of said ceramic being substantially a sodium ion conductor solid electrolyte selected from the group consisting of β--Al 2 O 3 , β"--Al 2 O 3 , and Na 1+x Zr 2 Si x P 3-x O 12 .
Claim 15
Dependent Claim
80 words
A ceramic comprising: 5 to 40 v/o ZrO 2 in the form of crystalline grains having a substantially tetragonal structure and having a diameter less than about 2 μm; 2 to 5.5 m/o Y 2 O 3 ; and the remainder of said ceramic being substantially a sodium ion conductor solid electrolyte selected from the group consisting of β--Al 2 O 3 , β"--Al 2 O 3 , and Na 1+x Zr 2 Si x P 3-x O 12 .
Claim 16
Dependent Claim
128 words
A two phase ceramic comprising: a first phase occupying 5 to 40 o/o of the volume of said ceramic, said first phase comprising ZrO 2 grains having a diameter less than about 2 μm with a rare earth oxide dissolved therein, said ZrO 2 having a tetragonal structure, said rare earth oxide being selected from the group consisting of Y 2 O 3 , CeO 2 , La 2 O 3 , and Er 2 O 3 ; and a second phase comprising a sodium ion conductor solid electrolyte selected from the group consisting of β--Al 2 O 3 , β"--Al 2 O 3 , and Na 1+x Zr 2 Si x P 3-x O 12 , said second phase occupying substantially all remaining volume of said ceramic.
Claim 17
Dependent Claim
128 words
A two phase ceramic comprising: a first phase occupying 5 to 40 o/o of the volume of said ceramic, said first phase comprising ZrO 2 grains having a diameter less than about 2 μm with a rare earth oxide dissolved therein, said ZrO 2 having a tetragonal structure, said rare earth oxide being selected from the group consisting of Y 2 O 3 , CeO 2 , La 2 O 3 , and Er 2 O 3 ; and a second phase comprising a sodium ion conductor solid electrolyte selected from the group consisting of β--Al 2 O 3 , β"--Al 2 O 3 , and Na 1+x Zr 2 Si x P 3-x O 12 , said second phase occupying substantially all remaining volume of said 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) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |