[margalabargala]

Cheaper yes. Non-aqueous sodium ion batteries (which are most of them) are more dangerous than LiFePO4 though.

[vitaminCPP]

In what way, if you don't mind me asking?

[margalabargala]

In the way that they are more likely to catch fire or explode or undergo thermal runaway.

https://advanced.onlinelibrary.wiley.com/doi/10.1002/aenm.20...

https://www.sciencedirect.com/science/article/abs/pii/S20954...