Active material electrode and cell comprising improved battery grade divalent silver oxide
Abstract
Abstract Battery grade divalent silver oxide (AgO) active material containing an additive selected from mercury, selenium, tellurium and combinations of mercury with lead or tin to provide improved electrical conductivity and/or improved stability in aqueous alkaline electrolyte, without substantially adversely affecting either property. The additive is present in the divalent silver oxide active material in amounts ranging from about 0.1 to about 5 percent by weight of silver, in both ionic and metallic form, in the active material. Instead of being incorporated into the divalent silver oxide active material, the selenium, tellurium, mercury-lead and mercury-tin additives are also effective when incorporated into the alkaline electrolyte of a battery employing divalent silver oxide positive electrodes. The preferred method for incorporating the additives into the divalent silver oxide active material is by chemical coprecipitation during its preparation, though they can also be physically admixed therewith. The divalent silver oxide active material contains at least 50 percent by weight of divalent silver oxide (AgO) with the balance of the active material comprising monovalent silver oxide (Ag2O) and metallic silver.
Inventors
- 👤 Aladar Tvarusko
Bibliographic Details
Claims Analysis
Total Claims: 10References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |