Aluminum capacitor components consist of an anode and a cathode. The anode is a rough-surfaced piece of aluminum that is electrochemically etched to form an oxide layer. This layer is the dielectric of the capacitor. The cathode is made of 98 percent grade aluminum and is covered with a layer of dielectric material with a thickness of 40 A.

The automotive industry is a major market for aluminum capacitors. The demand for aluminum capacitors in this industry is forecast to remain strong until 2023. Large-can aluminum capacitors are key components in DC link conversions. Automotive electronics is another strong market for aluminum capacitors. The demand for these components is expected to increase to al USD 5 billion by 2023.

The production of aluminum capacitors starts with the manufacturing of the components. Then electrolytic paper is placed between the anode and cathode foils and rolled into a cylindrical shape. These two elements are then connected with terminals. Next, the aluminum box is sealed. Once the component has been assembled, the next step is to provide voltage to the sealed capacitor.

Aluminum electrolytic capacitors are relatively insensitive to transient voltages but are relatively insensitive to lower frequencies. Hence, they are used in power supplies, DC-DC converters, and industrial motor assemblies. They are also used as energy storage devices.