Getting 10 times more power density than lithium-ion isn't hard. It's also not very interesting, as we have enough power density already. Now we need more energy density.
"charges 20 times faster", which is also found in the title, is a statement about power density.
My post was a reply to the post that decried nutty battery companies. I just wanted to point out that 20x power density of lithium ion is something that's actually feasible and available today. It, however, isn't all that useful and if you have to sacrifice even a single percent of energy density for it you're better off with lithium-ion batteries.
Indeed. And if you don't have enough power density to (for instance) absorb energy from regenerative braking and then accelerate out of a corner, you just add a large capacitor with a massive power density (but a low energy density).