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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
    
Nanotechnologies were on my mind when I was asking this question. Insulator=dielectric, right? –  Mozibur Ullah Dec 2 '12 at 22:46
    
Almost; dielectric are kind of Insulators, please check Wikipedia. –  TMS Dec 2 '12 at 22:48
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