New sodium-ion battery skips mechanical cooling with 97.9% efficiency

I’ve been hearing about these for a few years now. Huge if they work out at a large scale.

interestingengineering.com/energy/unigrid-sodium-ion-battery-tech

Any info about energy density?

According to Wikipedia:

Looks like power to weight it much higher, while energy per volume and energy per mass is comparable to existing lithium ion batteries.

idk about that, the regularly cited reason Na-ion batteries are mainly being looked at for grid storage rather than vehicle applications is their bad Wh/l and W/kg numbers compared to Li-ion. the table in the Na-ion article seems to use “1000W/kg” without a source, and it shows lithium as being about a third of that even though the Li-ion article quotes figures up to 10kW/kg.

seems the editors of the two articles aren’t cross-checking eachother.