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超级电容The Double Layer Capacitors developed by
WIMA are storage capacitors with highest capacitance values in the
Farad range. They are among others suited to serve as batteries, can
deliver considerably higher currents for a short time, however, and
are maintenance free.
The construction of a Double Layer
Capacitor can be described as a plate capacitor where the most
important topic is to obtain electrodes with an extremely large
surface. For this purpose activated carbon is ideally suited, as it
allows to obtain capacitance values of up to 100F/g of the active
mass of the electrode.
The electrolyte, the conductive liquid
between the electrodes, is a conducting salt dissolved in an aqueous
or organic solvent which permits to apply voltages of 2 V (in
special cases 3 V).
The actual double layer consists from
ions which attach to the electrodes - negative ions to the positive
electrode and positive ions to the negative electrode - as soon as a
voltage is applied to the cell and thus create a dielectric of a few
Angstrom only. According to the formula for the capacitor from the
dielectric constant of the double layer (approx. 10) and the
extremely thin dielectric you get an very high capacitance
value. |
