US4176214A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithium-lead sulfate primary electrochemical cell
Assignee: Verizon Laboratories Inc
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Filing: 1978-12-26
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Granted: 1979-11-27
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Expires: 1998-12-26
Abstract
Abstract Disclosed is a primary electrochemical cell which employs a lithium metal anode, a lead sulfate cathode, and an electrolyte solution comprising a lithium salt in an organic solvent. The cell has an operating voltage and energy density sufficiently close to conventional 1.5 V cells to permit their direct replacement.
Inventors
- 👤 Keith A. Klinedinst
- 👤 Carl R. Schlaikjer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:28
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/58; H01M4/5825; H01M6/00; H01M6/14; H01M6/16
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
46 words
A primary electrochemical cell comprising: (a) an anode comprising lithium metal; (b) a cathode comprising lead sulfate; said anode and cathode being spaced from each other and in contact with (c) an electrolytic solution which comprises a dissociable lithium salt dissolved in a liquid organic solvent.
Claim 2
Dependent Claim
46 words
A primary electrochemical cell comprising: (a) an anode comprising lithium metal; (b) a cathode comprising lead sulfate; said anode and cathode being spaced from each other and in contact with (c) an electrolytic solution which comprises a dissociable lithium salt dissolved in a liquid organic solvent.
Claim 3
Dependent Claim
16 words
A primary electrochemical cell according to claim 1 wherein the anode consists essentially of lithium metal.
Claim 4
Dependent Claim
16 words
A primary electrochemical cell according to claim 1 wherein the cathode consists essentially of lead sulfate.
Claim 5
Dependent Claim
26 words
A primary electrochemical cell according to claim 3 wherein the cathode contains an amount of a binder material effective to provide dimensional stability to the cathode.
Claim 6
Dependent Claim
41 words
A primary electrochemical cell according to claim 3 wherein the cathode contains an amount of a material selected from the group consisting of carbon black, graphite, lead powder, and mixtures thereof, which are effective to provide electronic conductivity to the cathode.
Claim 7
Dependent Claim
15 words
A primary electrochemical cell according to claim 1 wherein the organic solvent comprises propylene carbonate.
Claim 8
Dependent Claim
37 words
A primary electrochemical cell according to claim 6 wherein the organic solvent comprises a mixture of propylene carbonate with at least one other organic liquid selected from the group consisting of dimethoxyethane, dimethyl carbonate, tetrahydrofuran and 1,4-dioxane.
Claim 9
Dependent Claim
23 words
A primary electrochemical cell according to claim 7 wherein the solvent comprises from about 20 wt.% to about 60 wt.% of propylene carbonate.
Claim 10
Dependent Claim
40 words
A primary electrochemical cell according to claim 1 wherein the dissociable lithium salt is a member selected from the group consisting of LiClO 4 , LiAsF 6 , LiPF 6 , LiAlCl 4 , LiBF 4 and mixtures of these.
Claim 11
Dependent Claim
17 words
A primary electrochemical cell according to claim 9 wherein the dissociable lithium salt comprises LiAlCl 4 .
Claim 12
Dependent Claim
25 words
A primary electrochemical cell according to claim 1 wherein the cathode further comprises a minor amount of a material less electropositive than the lead sulfate.
Claim 13
Dependent Claim
20 words
A primary electrochemical cell according to claim 11 wherein the material less electropositive than the lead sulfate, comprises lead sulfide.
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) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |