Electric Double-Layer Capacitor (EDLC) – Supercapacitor

Type: Electrochemical capacitor (Supercap)

Working Principle: Energy storage via ion adsorption at the electrode-electrolyte interface (double-layer effect), no chemical reaction.

Key Features:

• • Very high capacitance (Farads to kilo-Farads)
• • High power density
• • Long cycle life (>500,000 cycles)
• • Low ESR (Equivalent Series Resistance)
• • Voltage typically limited to 2.5V–3.0V per cell
• • Lower energy density than batteries

Common Applications:

• • Backup power systems
• • Regenerative braking in vehicles
• • Power stabilization in renewable energy
• • Short-term energy storage

Materials: Activated carbon electrodes, organic or aqueous electrolyte.

Note: Requires voltage balancing when used in series stacks.