双电层电容器（EDLC）有时也称为电双层电容器，或超级电容器，是拥有高能量密度的电化学电容器，比传统的电解电容容量高上数百倍至千倍不等。

一个标准电池大小的电解电容电容为几十微法拉，但同样大小的EDLC的则可以达到几法拉，差别可达五个数量级。截至在2010年，最高商业化双电层电容器的能量密度为30 W⋅h/kg (0.1 MJ/kg)。高达85 W⋅h/kg的能量密度已在室温实验室实现，但仍然比锂电池低。

2011年，在实验室的双电层电容器的能量密度提高了一个数量级。EDLC的价格亦正在下降：在2000年成本为5000美元的3 kF电容在2011年只需50美元。

Electric double-layer capacitors (EDLC) are electrochemical capacitors which energy storage predominant is achieved by Double-layer capacitance. In the past, all electrochemical capacitors were called "double-layer capacitors". However, since some years it is known that double-layer capacitors together with pseudocapacitors are part of a new family of electrochemical capacitors called supercapacitors, also known as ultracapacitors. Supercapacitors do not have a conventional solid dielectric. See the entry on supercapacitors for an in depth treatment on the subject.