Electropaedia logo

Battery and Energy Technologies

 

 

Spacer
End cap
Finding your Way Around
Sponsors
Free Report

Buying Batteries in China

 
End cap

Spacer

Spacer

Green cap

Woodbank does not monitor or record these emails

Green cap
Spacer
Green cap
Green cap
Spacer
End cap
More Sponsors
 
End cap

 

* * *
*
* *

Zinc/Silver Oxide Batteries

Also called Silver Zinc Batteries

Characteristics

Common low capacity primary button cell versions are typically called Silver Oxide batteries. Higher capacity versions available as secondary cells are more often referred to as Silver Zinc batteries. They have an open circuit voltage of 1.6 Volts. Two types of Silver Oxide batteries are available, one type with a sodium hydroxide (NaOH) electrolyte and the other with a potassium hydroxide (KOH) electrolyte.

Because of the high cost of sliver they are available in either very small sizes as button cells where the amount of silver used is small and not a significant contributor to the overall product costs or they are available in very large sizes for critical applications where the superior performance characteristics of the silver oxide chemistry outweigh any cost considerations.

 

Advantages

High capacity per unit weight.

Long operating life. A tiny button cell will keep a watch running 24 hours per day for 3 to 5 years!!

Low self discharge and hence long shelf life (better than zinc air)

Better low temperature performance than zinc air

Flat discharge characteristics - flatter than the Alkaline Manganese Dioxide battery.

Higher voltage than zinc mercury cells.

 

Shortcomings

Uses expensive materials.

Lower energy density than zinc air.

Poor low temperature performance.

Limited cycle life.

Suffers from dissolving of the Zinc and the formation of Zinc dendrites which pierce the separator.

 

Applications

A major contribution to miniature power sources.

As a button cell it is well suited for hearing aids, instruments, photographic applications, electronic watches and other low power devices.

Larger size Silver Zinc batteries are used in submarines, missiles, underwater and aerospace applications.

Silver Zinc secondary cells being promoted as a safer alternative to Lithium cells. Plans to mitigate the higher costs by implementing a recycling programme.

 

Costs

More expensive than zinc air

Very expensive for high power applications

 

* *
* * *
*

 

History 

Cell Chemistry Comparison Chart

 

 

 

 

 

Print This Page || Home || FAQ || Site Map || Legal || Privacy Promise || Contacts

 
 

Woodbank Communications Ltd, South Crescent Road, Chester, CH4 7AU, (United Kingdom)
Copyright © Woodbank Communications Ltd 2005

Top