Let's see...skippy wrote:I found a bug on the Nature website and was able to read part of the paper. It looked like their highest energy design had about 10^-2 Wh/cc. That's about two orders of magnitude lower than Li-ions. They could be nice caps for other reasons --I didn't study the paper that closely. But it doesn't look like their energy density is going to even be able to challenge existing battery chemistry (unsurprisingly).GIThruster wrote:Did they give a specific energy density as compared to LiPo's?
1 Mlb or 453 600 kg vehicle, say (747-8 equivalent),
10 minutes at (very roughly) 5 GW to reach orbit,
(10/60 h)(5 000 000 000 W) = 833 333 333 propulsive Wh required,
overall efficiency, say, 75% --> 833 333 333/0.75 = 1 111 111 110 stored Wh required,
(1 111 111 110 Wh)/(0.01 Wh/cm^3) = 111 111 111 000 cm^3 for energy storage,
(111 111 111 000 cm^3)(1 m/100 cm)^3 = 111 111 m^3,
so the capacitors needed could fit into a cube with edge length of (111 111 m^3)^(1/3) = 48 m or 158 ft.
Bigger than my backyard, just for energy storage. No beer cooler. No go.