batteries are extremely expensive and pollute a lot in their production

Something better should indeed be invented. The USA should invest much more money into this (energy storing) segment of the industry, instead of putting a lot of money into various wars and battles, and into other similar things.

I am sure that if they would have been put that money into researching and development over the last few decades, then we would already have a much better energy storing technology.

I give you some !PIZZA.

Have a nice day. All the best. Greetings from Hungary.