Phys.org May 9, 2022
Researchers in South Korea investigated the thermal properties of electric double-layer capacitors (EDLCs) for a technical foundation in thermal measurement and revealed significant information. The reversible entropy and free energy changes in the EDLCs caused dynamic changes in the effective heat capacity of the electrodes, which were monitored in real-time during charge and discharge operations. In an EDLC with a 6 M KOH electrolyte, the effective heat capacities of the positive and negative electrodes with a varying voltage from 0 to 1 V were estimated to decrease by approximately 9.14% and 3.91%, respectively. This polarization dependence may be attributed to the capacitance capability, which is determined by the size of the adsorbed hydrated ions. The maximal capacitance and change in effective heat capacity were observed in the vicinity of 8 M concentration of KOH and attributed to changes in the thermodynamic state by the capacitance effect…read more. TECHNICAL ARTICLE
Effectively managing the thermal properties of energy storage devices is the key to avoiding thermal runaway and ensuring safety… Credit: Gwangju Institute of Science and Technology (GIST)