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According to wikipedia, commercially available super-capacitors in 2010 can store 30Wh/kg, with 85Wh/kg achieved in a lab in 2011.

Have any theoretical calculations been done to show what can be achieved as an upper limit to super-capacitors?

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I can't see reasons for such limit, can you? – TMS Dec 2 '12 at 21:34
    
Unfortunately this is the kind of physics I'd have been a dab hand at school. I doubt (correction, I know) I can't work out the storage capacity of a simple capacitor. If there are no theoretical limits, what are the main limiting factors from a practical point of view? – Mozibur Ullah Dec 2 '12 at 22:37
    
From practical point of view in my opinion is how good the insulator between the plates of the capacitor, and I think (just my assumption) that nanotechnologies plays an important rule in making such new materials. – TMS Dec 2 '12 at 22:43
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en.wikipedia.org/wiki/Field_electron_emission refers to a kind of breakdown that causes electrons to move without a substrate, This presumably puts upper limits on the electric field strength for given materials, and charge density has an upper limit that clearly varies with mass (since capacitors have no net charge and the charge carriers have mass, the maximum charge separation is #e+#P). – Zackkenyon Dec 12 '15 at 21:12
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it's a pretty interesting question! I'm surprised it didn't receive much attention. I don't think my answer is very good, but I think it's a starting point. – Zackkenyon Dec 14 '15 at 11:05

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