Sodium doesn't make sense for vehicles when there are safer lithium chemistries like LiFePO4 that have lower density than the combustible ones but better than s

Sodium doesn't make sense for vehicles when there are safer lithium chemistries like LiFePO4 that have lower density than the combustible ones but better than sodium. LiFePO4, and presumably sodium-ion, can burn once ignited but should be hard to get started.