Electrolytic capacitors feature one: the capacitance per unit volume is very large, dozens to hundreds of times larger than other types of capacitors.

Electrolytic capacitor characteristics two: the rated capacity can be very large, can easily do tens of thousands of μf or even a few f (but can not be compared with the double layer capacitance).

The price of electrolytic capacitors has an overwhelming advantage over other types, because the constituent materials of electrolytic capacitors are ordinary industrial materials, such as aluminum and so on. The equipment for manufacturing aluminum electrolytic capacitors is also ordinary industrial equipment, which can be mass-produced and the cost is relatively low.

Aluminum electrolytic capacitor will be broken, it is only a matter of time. There are many reasons that affect the life of the capacitor, overvoltage, reverse voltage, high temperature, rapid charge and discharge, etc., under normal use, the biggest impact is the temperature, because the higher the temperature, the faster the evaporation loss of the electrolyte. It should be noted that the temperature here does not refer to the ambient or surface temperature, but to the working temperature of the aluminum foil. Manufacturers usually label the capacitor life and test temperature on the capacitor body.