I don't know much about costs, but papers like this make me pretty giddy at the prospect of supercapacitor-only cars. https://www.ncbi.nlm.nih.gov/pmc/articles

I don't know much about costs, but papers like this make me pretty giddy at the prospect of supercapacitor-only cars. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6409971/#sec1-nanomaterials-09-00148title https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6409971/#sec1-n... That energy density is at least as high as current generation lithium ion, which is obviously already feasible for production cars.