Do some research on "Aluminium battery technology" (also substitute aluminium for those americans who cant spell).

Lithium battery technology will always be hamstrung by the inescapable drawbacks of lithium, namely flammability. Imagine the "galaxy S7 note syndrome" if it happened in Tesla model 3's, or any other battery powered EV.

Lithium is simply the best compromise available at the moment

Aluminium is looking very promising as the next generation (pun) battery technology.

Perhaps consider this area as worthy of an investment