Aeroplanes now! Well I did have one with a supercap that could carry its own weight happily around for nearly 3 minutes.....
The energy density of hydrocarbon fuels is 20-50 times higher than the most advanced Li-ion concept based electrochemical batteries.
Wake me up when it's 2-5x higher, and the battery's brisance a fair bit less than good 'ol black-powder.
Ye'd do better to use the piddling amount of very expensive renewable energy that we produce to synthesize a better grade of avtur.
And if you sit down and think about the chemistry, engineering and economics carefully enough, is the truth of the matter.
Mac
