From: Colin Hales (colin@versalog.com.au)
Date: Tue Mar 05 2002 - 06:30:24 MST
Michael M. Butler wrote........
> I've got a couple of sample carbon-aerogel supercapacitors right now. 10
> Farad, 2.75 volt, the size of AA cells with incredibly low ESR. Nifty. I'm
> torn between building some sort of BEAM device and using them for
spotwelding
> thermocouple junctions...
Nifty they are. I can't believe the size for the F.
In terms of Energy density, however, we really need kiloFarads to really get
things moving. (You cap: 0.5CV^2 = 37 joules in AA, Q = CV = 27.5 =
coulombs). You can get your 27500A for 1 millisecond or so though!
I just found this:
** MINI FUEL CELL POWER SOURCE COULD REPLACE EXISTING RECHARGEABLE BATTERIES
The days of fast-fading cellular phone batteries may soon be over.
Researchers at the Lawrence Livermore National Laboratory (LLNL)
recently developed a working prototype for a portable fuel cell
energy source that could power a cellular phone 300 percent longer
than existing rechargeable batteries do.
http://sciam.rsc03.net/servlet/cc?lJpDUWEJhspgFOLklHshnDJhtDHNE0EXZX
The casing of our techno toys should be the energy source. The cost/energy
density problem is holding up so many advancements it's not funny. I'm
thinking of ultra-cap batteries with inbuilt regulators/chargers that you
leave in the sun to charge up. Here's hoping someone gets their olive pits
out and get's on with it.
Colin
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