Supercapacitor characterization by galvanostatic polarization method (DC characterizations) – Supercapacitor – Application Note 51

Abstract

The characteristics of supercapacitors can be determined using many electrochemical protocols like cyclic voltammetry, impedance spectroscopy, potentiostatic and galvanostatic methods.

This note describes how to evaluate the characteristics of a supercapacitor (capacitance, capacity, energy, internal resistance and coulombic efficiency) using the galvanostatic polarization method and the “Capacity & Energy per Cycle or Sequence” analysis tool available in EC-Lab® software.

Introduction

Supercapacitors known as Electric Double Layer Capacitors (EDLCs) are used as energy storage devices for applications requiring power for short periods of time. Typically an EDLC consists of two porous carbon-based electrodes electrically isolated by a porous separator. The separator and the electrodes are impregnated with an electrolyte, which allows the ionic current to flow between the electrodes while preventing electronic current from discharging the supercapacitor [1]

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