On Fri, 16 Nov 2018 07:36:18 -0700, Dan Marotta wrote:

Wow!Â* Looking at the atomic mass of each, that would be about a 50%
increase (~65 for Zn and 16 or O) if all of the zinc was oxidized! Now
I'm no chemist, that that looks HUGE to me!

Yep - thats approximately a 25% weight increase. The zinc electrode will
expand too: Zinc has a density of 7.14 vs 5.6 for ZnO, which implies
something like a 28% volume increase if all the zinc in the battery of is
oxidised when fully discharged. However, 100% oxidation is rather
unlikely in any practical battery, and dealing with the volume increase
means designing the case so it doesn't split when the battery is fully
discharged.


--
Martin | martin at
Gregorie | gregorie dot org