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#19
November 16th 18, 02:54 PM
posted to rec.aviation.soaring
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Rechargeable Zinc-Air battery moves closer to commercialization
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 
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