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> So its not even close yet

Yes, if you compare just capacity fade, that's true. But the longevity of LiFePo4 comes with a lower charge density than Li-Ion, about 170 mAh/g. This NaS battery currently has 1017 mAh/g, so almost a factor of 6. If the capacity is higher, you don't have to cycle as often, but of course, mileage depends on the use case.



That lower capacity comes at a cost cut and a huge materials advantage. LFPs are made of highly available materials. (Lithium, iron and phosphate).

The higher capacity NMC batteries are constrained on nickel production.




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