What is the basis for Toyota's fluorine battery claims?

[theycallmevirgo]

TL;DR

Why is Toyota researching Fluorine batteries when LiIon cell potentials are higher?

Google top result says Toyota is researching Fluorine batteries that they claim will have 7x energy density of LiIon. However my textbook table of reduction potential gives lithium as higher than fluorine. Any idea what they base their claims on?

Thanks

Joe

 

[Tom.G]

That "7x energy density" describes 7x the stored electrical energy for the same weight... or equivalently, the same range with 1/7 the battery weight.

Above from:
https://www.electrive.com/2020/08/14/toyota-developing-flouride-ion-battery-with-1000-km-range/

Which was found with:
https://www.google.com/search?&q=Fluorine+batteries

Remember, 'Google is your friend'; please use it.

 

[theycallmevirgo]

I got that far. My point is how do they achieve this? Simply by virtue of fluorine being gaseous at room temp?

 

[Borek]

Fluorine batteries don't use fluorine for redox, it is just shuffled between anode and cathode.

https://en.wikipedia.org/wiki/Fluoride_battery

Besides, energy density of a battery doesn't depend just on the redox reaction involved, it also needs to take into account mass of every other substance required for a correct operation.