The working principle and characteristics of low resistance aluminum electrolytic capacitors?

Low-resistance aluminum electrolytic capacitors are usually made of metal foil (aluminum/tantalum) as the positive electrode, and the insulating oxide layer of the metal foil (aluminum oxide/tantalum pentoxide) as the dielectric. Electrolytic capacitors are divided into aluminum electrolytic capacitors based on their positive electrodes. And tantalum electrolytic capacitors. The negative electrode of aluminum electrolytic capacitors is composed of thin paper/film or electrolytic polymer impregnated with electrolyte (liquid electrolyte); the negative electrode of tantalum electrolytic capacitors usually uses manganese dioxide. Since the electrolyte is used as the negative electrode (be careful to distinguish it from the dielectric), the electrolytic capacitor gets its name.

1. The capacitance per unit volume is very large, tens to hundreds of times larger than other types of capacitors.
2. The rated capacity can be very large, which can easily be tens of thousands of μf or even a few f (but not comparable to the electric double layer capacitance).
3. The price has an overwhelming advantage over other types, because the constituent materials of electrolytic capacitors are common industrial materials, such as aluminum. The equipment for manufacturing electrolytic capacitors is also common industrial equipment, which can be produced on a large scale with relatively low cost.