Aluminum capacitors are electronic components used to store energy in electronic circuits or to meet the power requirements of power supplies. Capacitors are made with a coating between electrically conductive and non-conductive materials, with a dielectric material between the two electrodes.

Aluminum capacitors are cheaper and easier to manufacture than other capacitors, but they have less energy storage capacity than others. They are generally available in small sizes and various shapes and are used in a variety of electronic devices, particularly power supplies.

Aluminum capacitors can be more sensitive to temperature, humidity and other environmental conditions and therefore have a shorter life. Instead, other types (for example, polypropylene or polyester capacitors) with a longer life and higher energy storage capacity may be preferred.