US4696875A
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Positive electrode for alkaline storage cells
Assignee: VARTA Batterie AG
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Filing: 1986-06-04
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Granted: 1987-09-29
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Expires: 2006-06-04
Abstract
Abstract A positive electrode for alkaline storage cells is disclosed. The active material for the positive electrode is a double hydroxide of the formula [M.sup.2+.sub.(1-x) Fe.sup.3+.sub.x (OH).sub.2 ].sup.x+ [(x/n)X n- . y H 2 O] x- wherein x is in the range 0.05≦x≦0.4, M 2+ is an oxidizable and reducible, and X n- is at least one anion. The double hydroxide has a pyroaurite-like double layer structure and is electrochemically resistant to iron poisoning. In a preferred embodiment, the double hydroxide comprises [Ni 4 Fe(OH) 10 ] 30 [NO 3 - .yH 2 O] 31 . Methods for preparing positive electrodes having the double hydroxide active material are also disclosed.
Inventors
- 👤 Oskar Glemser
- 👤 Dieter H. Buss
- 👤 Jurgen Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:39
CPC Classifications
C; C01; C01G; C01G53/00; C01G53/80; C01G53/82; C01G51/00; C01G51/80; C01G51/82; H; H01; H01M; H01M4/00; H01M4/02; H01M4/24; H01M4/26; H01M4/28; H01M4/36; C01P; C01P2002/00; C01P2002/20; C01P2002/22; C01P2002/50; C01P2002/52; C01P2002/70; C01P2002/78; C01P2006/00; C01P2006/40; C01P2006/80; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
53 words
A positive electrode for secondary cells having alkaline electrolytes, wherein the active material comprises a double hydroxide having the formula [M.sup.2+.sub.(l-x) Fe.sup.3+.sub.x (OH).sub.2 ].sup.x+ [(x/n)X.sup.n-..sub.y H.sub.2 O].sup.x- wherein x is in the range 0.05≦×≦0.4 wherein the M 2+ is an oxidizable and reducible cation, and wherein X n- is at least one anion.
Claim 2
Dependent Claim
53 words
A positive electrode for secondary cells having alkaline electrolytes, wherein the active material comprises a double hydroxide having the formula [M.sup.2+.sub.(l-x) Fe.sup.3+.sub.x (OH).sub.2 ].sup.x+ [(x/n)X.sup.n-..sub.y H.sub.2 O].sup.x- wherein x is in the range 0.05≦×≦0.4 wherein the M 2+ is an oxidizable and reducible cation, and wherein X n- is at least one anion.
Claim 3
Dependent Claim
7 words
The electrode of claim 1, wherein x=0.2.
Claim 4
Dependent Claim
15 words
The electrode of claim 1, wherein the double hydroxide has a pyroaurite-like double layer structure.
Claim 5
Dependent Claim
21 words
The electrode of claim 1 wherein M 2+ is selected from the group consisting of Ni 2+ and Co 2+ .
Claim 6
Dependent Claim
28 words
The electrode of claim 1 wherein X n- is selected from the group consisting of NO 3 - , SO 4 2- , and CO 3 2- .
Claim 7
Dependent Claim
18 words
The electrode of claim 1 further comprising support means for supporting said active material in said secondary cell.
Claim 8
Dependent Claim
70 words
A positive electrode for secondary cells having alkaline electrolytes, wherein the active material comprises a double hydroxide having the formula [M.sup.2+.sub.(l-x) Fe.sup.3+.sub.x (OH).sub.2 ].sup.x+ [(x/n)X.sup.n-..sub.y H.sub.2 O].sup.x- wherein x=0.2, wherein M 2 + is selected from the group consisting of Ni 2+ and CO 2+ , and wherein X n- is selected from the group consisting of NO 3 - , SO 4 2- , and CO 3 2- .
Claim 9
Dependent Claim
70 words
A positive electrode for secondary cells having alkaline electrolytes, wherein the active material comprises a double hydroxide having the formula [M.sup.2+.sub.(l-x) Fe.sup.3+.sub.x (OH).sub.2 ].sup.x+ [(x/n)X.sup.n-..sub.y H.sub.2 O].sup.x- wherein x=0.2, wherein M 2 + is selected from the group consisting of Ni 2+ and CO 2+ , and wherein X n- is selected from the group consisting of NO 3 - , SO 4 2- , and CO 3 2- .
Claim 10
Dependent Claim
15 words
The electrode of claim 7 wherein the double hydroxide has a pyroaurite-like double layer structure.
Claim 11
Dependent Claim
19 words
The electrode of claim 7, wherein M 2+ is Ni 2+ and X n- is NO 3 - .
Claim 12
Dependent Claim
35 words
A positive electrode for secondary cells having alkaline electrolytes, wherein the active material comprises a double hydroxide having the formula [Ni.sub.4 Fe(OH).sub.10 ].sup.+ [NO.sub.3.sup.-..sub.y H.sub.2 O].sup.-, said double hydroxide having a pyroaurite-like double layer structure.
Claim 13
Dependent Claim
35 words
A positive electrode for secondary cells having alkaline electrolytes, wherein the active material comprises a double hydroxide having the formula [Ni.sub.4 Fe(OH).sub.10 ].sup.+ [NO.sub.3.sup.-..sub.y H.sub.2 O].sup.-, said double hydroxide having a pyroaurite-like double layer structure.
Claim 14
Dependent Claim
83 words
An alkaline storage battery comprising a positive electrode, a negative electrode, and an electrolyte, said positive electrode having an active material comprising a double hydroxide of the formula [M.sup.2+.sub.(l-x) Fe.sup.3+.sub.x (OH).sub.2 ].sup.x+ [(x/n)X.sup.n-..sub.y H.sub.2 O].sup.x- wherein y is in the range of 0.05≦×≦0.4, wherein M 2+ is selected from the group consisting of Ni 2+ and Co 2+ , and wherein X n- is selected from the group consisting of NO 3 - , SO 4 2- , and CO 3 2- .
Claim 15
Dependent Claim
83 words
An alkaline storage battery comprising a positive electrode, a negative electrode, and an electrolyte, said positive electrode having an active material comprising a double hydroxide of the formula [M.sup.2+.sub.(l-x) Fe.sup.3+.sub.x (OH).sub.2 ].sup.x+ [(x/n)X.sup.n-..sub.y H.sub.2 O].sup.x- wherein y is in the range of 0.05≦×≦0.4, wherein M 2+ is selected from the group consisting of Ni 2+ and Co 2+ , and wherein X n- is selected from the group consisting of NO 3 - , SO 4 2- , and CO 3 2- .
Claim 16
Dependent Claim
24 words
The alkaline storage battery of claim 11 wherein x=0.2, M 2 + is Ni 2+ , and X n- is NO 3 - .
Claim 17
Dependent Claim
15 words
The alkaline storage battery of claim 11 wherein the negative electrode comprises Fe/Fe(OH) 2 .
Claim 18
Dependent Claim
15 words
The alkaline storage battery of claim 13 wherein the negative electrode comprises Cd/Cd(OH) 2 .
Claim 19
Dependent Claim
13 words
The alkaline storage battery of claim 13 wherein the negative electrode comprises Zn/ZnO.
Claim 20
Dependent Claim
12 words
The alkaline storage battery of claim 13 wherein the electrolyte comprises KOH.
References Cited (Backward Citations)
US4224392A
Cited
US4603094A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-28 | 1991-03-30 | 1991-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-28 | 1995-03-30 | 1995-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-28 | 1999-03-30 | 1999-09-29 | $7700.00 | Window Closed / Lapsed |