US4052540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substantially non-gassing alkali resistant battery separator and method of producing same
Assignee: McDonnell Douglas Corp
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Filing: 1970-11-16
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Granted: 1977-10-04
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Expires: 1990-11-16
Abstract
Abstract Production of inorganic porous sintered battery separator substantially eliminating formation of gas when in contact with a zinc electrode, and permitting long cycle life of a high energy density battery such as a silver-zinc battery, produced according to one embodiment by initially firing a mixture of magnesium-bearing material, e.g., MgO, zinc-bearing material, e.g., ZnO, and silica (SiO 2 ), at temperature in the range of about 1,100 to about 1,500° C, to produce a magnesium silicate-zinc silicate composition, granulating and compacting said composition into plaques, and sintering said compacted plaques at temperature ranging from about 1,000° to about 1,300° C, to produce porous sintered separator members, in the form of a sintered solid solution of magnesium silicate and zinc silicate, having good transverse strength and low resistivity.
Inventors
- 👤 Joseph S. Smatko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:00
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/489; H01M50/409; H01M50/431; H01M50/434; H01M50/491; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
63 words
A substantially non-gassing high alkali resistant battery separator when employed with a zinc electrode, and having low resistivity, and inhibiting effect on zinc dendrite formation, in the form of a porous member consisting essentially os sintered particles of a single phase solid solution of about 60 to about 99 mol percent magnesium silicate and about 1 to about 40 mol percent zinc silicate.
Claim 2
Dependent Claim
63 words
A substantially non-gassing high alkali resistant battery separator when employed with a zinc electrode, and having low resistivity, and inhibiting effect on zinc dendrite formation, in the form of a porous member consisting essentially os sintered particles of a single phase solid solution of about 60 to about 99 mol percent magnesium silicate and about 1 to about 40 mol percent zinc silicate.
Claim 3
Dependent Claim
50 words
A battery separator as defined in claim 1, said solid solution consisting essentially of about 75 to about 95 mol percent magnesium silicate and about 5 to about 25 mol percent zinc silicate, said separator having a porosity corresponding to a water absorption ranging from about 5% to about 50%.
Claim 4
Dependent Claim
34 words
A battery separator as defined in claim 1, said separator having a modulus of rupture ranging from about 8,000 to about 18,000 psi, and a resistivity ranging from about 5 to about 50 ohm-cm.
Claim 5
Dependent Claim
23 words
A flexible battery separator as defined in claim 1, said sintered composition in particulate form being distributed uniformly in a polymeric organic binder.
Claim 6
Dependent Claim
32 words
A flexible battery separator as defined in claim 2, said sintered composition in particulate form being distributed uniformly in a polymeric binder selected from the group consisting of polyphenylene oxide and polytetrafluoroethylene.
Claim 7
Dependent Claim
53 words
In a battery containing a zinc electrode, a substantially non-gassing battery separator as defined in claim 1. of a porous member comprising a sintered composition of magnesium silicate and zinc silicate, said composition containing not less than about 60 mol percent magnesium silicate and not more than about 40 mol percent zinc silicate.
Claim 8
Dependent Claim
52 words
In a battery as defined in claim 6, said solid solution consisting essentially of about 75 to about 95 mol per cent magnesium silicate and about 5 to about 75 mol per cent zinc silicate, said separator having a porosity corresponding to a water absorption ranging from about 5% to about 50%.
Claim 9
Dependent Claim
32 words
In a battery as defined in claim 6, said zinc electrode being positioned on one side of said separator and including a silver electrode positioned on the opposite side of said separator.
References Cited (Backward Citations)
US3169072A
Cited
US3446668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |