1. Electrochemical capacitors
1.1 Technologies and main families
An electrolytic capacitor (or electrochemical capacitor, or both) is made up of the following three elements:
a metal anode (positive armature) made of aluminum, tantalum or niobium, although the latter technology is rarely used;
a dielectric layer resulting from oxidation of the anode metal: aluminum oxide, tantalum oxide or niobium oxide;
the cathode, made up of the conductive electrolyte itself and the metal cathode (negative armature), which merely acts as a link between the electrolyte and the external circuit.
The capacitor thus formed is polarized: the potential of the anode must always be positive...
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Electrochemical capacitors
Film capacitors
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