Lithium is pretty much the best possible chemical to build batteries out of.
Depends on how you define “best”. Likely the highest possible short-term energy density, yes, but that isn’t the only thing we might want out of a battery. “Doesn’t catch fire” is one of the areas where the highest-energy lithium battery chemistries are far from the best, for instance.
Lithium’s energy density is largely the cause of its flammability - if you accept density and capacity comparable to another battery chemistry, you can get it down to a comparable fire risk, even if there’s not much point bothering.
Depends on how you define “best”. Likely the highest possible short-term energy density, yes, but that isn’t the only thing we might want out of a battery. “Doesn’t catch fire” is one of the areas where the highest-energy lithium battery chemistries are far from the best, for instance.
Lithium’s energy density is largely the cause of its flammability - if you accept density and capacity comparable to another battery chemistry, you can get it down to a comparable fire risk, even if there’s not much point bothering.