Method of manufacturing a stable divalent silver oxide depolarizer mix
US4015056A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1976 |
| Grant date | Mar 29, 1977 |
| Priority date | — |
| Expiry date | Mar 15, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01M4/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for manufacturing a stable divalent silver oxide depolarizer mix wherein the mix is treated with a mild reducing solution of a reducing agent such as methanol followed by a treatment with a strong reducing solution of a reducing agent such as hydrazine to form a layer of silver on the surface of the depolarizer mix. The depolarizer mix is specially prepared for use in a primary alkaline cell which is discharged at a single voltage plateau, and the preliminary treatment of the mix with the mild reducing solution permits the incorporation of greater amounts of divalent silver oxide in the mix, thereby increasing the electrochemical capacity while still providing a single voltage plateau discharge. The treatment with the mild reducing solution generally requires soaking the mix in a solution containing a reducing agent for up to about 10 minutes and may be carried out at either room or elevated temperature. The subsequent treatment with a strong reducing solution may also require up to about 10 minutes at either room or elevated temperature, with the purpose to provide a substantially continuous and electrolyte permeable layer of silver on the surface of the depolarizer mix. …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.