> We have a different definition of "rapidly", and a different definition of need. Battery density is the single largest brake on the day-to-day usefulness of electronic devices right now. 3x is nothing. 10x is better, 100x is what we probably need.
I think we probably disagree on two points. First, it seems unlikely that it is even physically possible to beat current lithium ion energy density by 100x. That would imply batteries that are 2x as energy dense as gasoline. I think there's pretty good reason to believe that is not possible -- i.e. there is no easily reversible configuration of atoms that will yield that level of density.
Even if it were physically possible, I doubt that we'd be there today even if we had bent the entire productive capacity of the planet to this problem excluding all others for the last thirty years. You can't make a baby in a month even if you have nine willing mothers to be.
If you're inclined to strengthen the argument you're presenting here, I have one suggestion. If there is widespread underfunding of battery or precursor research, experts in the field are probably talking about this fact. You should be able to find some talk by a respected academic showing that particular worthy ideas likely to add value that aren't being researched for lack of funds. Another option would be to demonstrate that recent advances in battery technology resulted from blue-sky research in the past of the kind that 1. isn't being funded today and 2. could not reasonably have been foreseen to lead to improvements in battery energy density.
(I should also just point out that the whole thesis that we have stopped funding basic research is not even true, see here: https://www.aaas.org/sites/default/files/2020-05/FunctionNON... -- general science funding, after adjusting for inflation, has increased substantially over time.)
I also question your estimate of the importance of energy density, but that's a secondary issue, since I think your views on how fast the technology could be developed are unrealistic under any spending scenario.