Silver oxide battery
(Redirected from Silver oxide cell)
Silver oxide batteries are primary cells. They are generally found in small sizes. They are expensive because they contain silver, but do not have toxic mercury like the cheaper mercury battery. They generate electricity by oxidation of zinc with silver(I) oxide. It has a basic electrolyte, usually potassium hydroxide or sodium hydroxide.
Chemical background
Some chemical reactions happen during discharging:
- Reduction: [math]\displaystyle{ \mathrm{Ag_2O + H_2O + 2e^{\operatorname{-}} \longrightarrow\, 2Ag + 2(OH)^{\operatorname{-}}} }[/math]
- Oxidation: [math]\displaystyle{ \mathrm{Zn + 2(OH)^{\operatorname{-}} \longrightarrow\, ZnO + H_2O + 2e^{\operatorname{-}}} }[/math]
- Redox: [math]\displaystyle{ \mathrm{2Ag^{\operatorname{+}} + Zn \longrightarrow\, 2Ag + Zn^{2\operatorname{+}}} }[/math]
- All: [math]\displaystyle{ \mathrm{Ag_2O + Zn \longrightarrow\, 2Ag + ZnO} }[/math]
Silver Oxide Battery Media
Several sizes of button and coin cells, some of which are silver oxide
Silver oxide battery used to power a quartz watch movement; battery is marked as containing no mercury
.png)
