Due to their high specific volumetric capacitance, electrolytic capacitors are used in many fields of power electronics, mainly for filtering and energy storage functions. Their characteristics change strongly with fre. ••A comprehensive review on the properties of electrolytic capacitor is presented.••Characteristics o. Capacitors are used in many fields of electronics and their main uses are the following:••. In conversion systems, electrolytic capacitors, which ensure a stable DC network, are an important part of the electrical energy conversion chain. During operation, they a. It has been seen that normal use leads to the evaporation of the electrolyte and the repair of the oxide layer. These are two causes of electrolyte disappearance, which is therefore the e. In this paper, a review of operation and properties of electrolytic capacitors is presented. A focus has been done on the respective characteristics of three different types of electrolyt.