Somebody may come up with a new battery chemistry. There are many people trying. There are constraints other than energy density - charge rate, discharge rate, safety, lifetime, cooling, etc. Lithium-air batteries have an energy density which potentially approaches that of gasoline, but decades of work have not produced anything usable.[1]

There are, of course, small startups promising usable lithium-air batteries Real Soon Now.[2]

[1] https://en.wikipedia.org/wiki/Lithium%E2%80%93air_battery

[2] https://airenergyllc.com/