[lifesaviors] FYI -- Hydrogen-Ozone depletion 1 of 4
- From: "Lion Kuntz" <lionkuntz@xxxxxxxxx>
- To: lifesaviors@xxxxxxxxxxxxx
- Date: Sat, 28 Jun 2003 12:56:55 -0800
http://www.electricitystorage.org/tech/technologies_technologies_supercapacitor.htm
Description:
Electrochemical capacitors (EC) store electrical energy in the two series
capacitors of the electric double layer (EDL), which is formed between each of
the electrodes and the electrolyte ions. The distance over which the charge
separation occurs is just a few angstroms. The capacitance and energy density
of these devices is thousands of times larger than electrolytic capacitors.
The electrodes are often made with porous carbon material. The electrolyte is
either aqueous or organic. The aqueous capacitors have a lower energy density
due to a lower cell voltage but are less expensive and work in a wider
temperature range. The asymmetrical capacitors that use metal for one of the
electrodes have a significantly larger energy density than the symmetric ones
and have lower leakage current.
Compared to lead-acid batteries, EC capacitors have lower energy density but
they can be cycled tens of thousands of times and are much more powerful than
batteries (fast charge and discharge capability).
Deployment Status: While the small electrochemical capacitors are well
developed, the larger units with energy densities over 20 kWh/m3 are still
under development.
Developers:
SAFT
NESS
ESMA
PowerCache (Maxwell)
ELIT
PowerSystem Co.
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