US4071664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolyte salt additive
Assignee: Duracell Inc USA
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Filing: 1977-04-01
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Granted: 1978-01-31
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Expires: 1997-04-01
Abstract
Abstract An electrochemical cell comprising an active metal anode and an electrolyte solvent/cathode depolarizer which reduces anode passivation during long time storage, even at elevated temperatures, by the inclusion of a minor proportion of an electrolyte salt additive having a clovoborate anion structure.
Inventors
- 👤 Arabinda N. Dey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:43
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
54 words
An electrochemical cell comprising an anode, a cathode depolarizer, a cathode collector, and an electrolyte comprising said depolarizer having dissolved therein a first electrolyte salt and a minor amount of a second salt having a metal cation and a clovoborate anion, said second salt being present in an amount sufficient to alleviate voltage delay.
Claim 2
Dependent Claim
54 words
An electrochemical cell comprising an anode, a cathode depolarizer, a cathode collector, and an electrolyte comprising said depolarizer having dissolved therein a first electrolyte salt and a minor amount of a second salt having a metal cation and a clovoborate anion, said second salt being present in an amount sufficient to alleviate voltage delay.
Claim 3
Dependent Claim
31 words
The electrochemical cell of claim 1 wherein the amount of said second salt with respect to said first salt is within a mole ratio of from about 0.01:1 to about 0.35:1.
Claim 4
Dependent Claim
34 words
The electrochemical cell of claim 1 wherein said anode is comprised of a metal selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba and Al or combinations thereof.
Claim 5
Dependent Claim
11 words
The electrochemical cell of claim 1, wherein said metal is Li.
Claim 6
Dependent Claim
34 words
The electrochemical cell of claim 1 wherein the cation of said second salt is selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba, and Al and combinations thereof.
Claim 7
Dependent Claim
61 words
The electrochemical cell of claim 1 wherein the clovoborate anion has a formula (B m X n ) -k wherein m, n and k are integers with m ranging from 6-20, n ranging from 6-18 and k ranging from 1-4, B is boron, and X is selected from the group consisting of H, F, Cl, Br, I, OH and combinations thereof.
Claim 8
Dependent Claim
33 words
The electrochemical cell of claim 4 wherein said cathode depolarizer comprises a material selected from the group consisting of a fluid oxyhalide, a fluid non-metallic oxide, a fluid non-metallic halide, and mixtures thereof.
Claim 9
Dependent Claim
14 words
The electrochemical cell of claim 4 wherein said cathode depolarizer is SOCl 2 .
Claim 10
Dependent Claim
54 words
The electrochemical cell of claim 4 wherein said first electrolyte salt is selected from the group consisting of lithium tetrachloroaluminate, tetrachloroborate, hexafluorophosphate, hexafluoroarsenate, hexachloroantimonate, hexachlorotitanate, hexachlorostannate, tetrachlorogallate, tetrachloroindate, tetraphenylborate, tetraalkylborate (LiB (C n H 2n+1 ) 4 wherein n is an integer from 1-5), benzene sulfonate, halides, perchlorate; and aluminum trichloride and boron trichloride.
Claim 11
Dependent Claim
63 words
The electrochemical cell of claim 7, wherein said cathode depolarizer is selected from the group consisting of SO 2 , SO 3 , VOCl 3 , CrO 2 Cl 2 , SO 2 Cl 2 , NO 2 Cl, NOCl, NO 2 , SeOCl 2 , POCl 3 , SOCl 2 , S 2 Cl 2 , and S 2 Br 2 .
Claim 12
Dependent Claim
18 words
The electrochemical cell of claim 8 wherein said second salt is Li 2 B 10 Cl 10 .
Claim 13
Dependent Claim
10 words
The electrochemical cell of claim 6 wherein X is halogen.
Claim 14
Dependent Claim
14 words
The electrochemical cell of claim 11 wherein said first electrolyte salt is lithium tetrachloroaluminate.
Claim 15
Dependent Claim
12 words
The electrochemical cell of claim 13 wherein said mole ratio is 0.1:1.
References Cited (Backward Citations)
US4012564A
Cited
US4020240A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |