This stuff is always "poised for breakthrough". But we are still stuck on LiOn batteries, which have been around for what, 20 years? Wake me up when we have som

This stuff is always "poised for breakthrough". But we are still stuck on LiOn batteries, which have been around for what, 20 years? Wake me up when we have something that doubles the capacity of LiOn batteries in a similar form-factor and safety rating, propelling Teslas to 600km+ ranges. That would be a real "breakthrough".