Scientists Discover Key to Safer Energy Storage Devices


Researchers uncover vital adjustments within the thermal properties of power storage gadgets throughout operation, paving the way in which in direction of higher thermal administration.

Trendy power storage gadgets, corresponding to supercapacitors and batteries, have extremely temperature-dependent efficiency. If a tool will get too sizzling, it turns into prone to ‘thermal runaway.’ Thermal runaway—or uncontrolled overheating—can finally end in harmful explosions or fires. Adopting a well-informed thermal administration technique is required for the secure and protected operation of gadgets. To do that, it’s mandatory to perceive how sure thermal properties, like warmth capability (Cp), dynamically change throughout charging and discharging.

Just lately, researchers from the Gwangju Institute of Science and Expertise (GIST) investigated the thermal properties of electrical double-layer capacitors (EDLCs)—a sort of supercapacitor having excessive energy and lengthy life—for a technical basis in thermal measurement and revealed important info. “Using the 3ω hot-wire method, we were able to measure the change in heat capacity of EDLCs in real-time in a microscopic electrode-electrolyte volume, which is an active site for the adsorption and desorption of ions,” explains Prof. Jae Hun Seol, who led the research.

The research was made accessible on-line on February 5, 2022, and shall be printed in Quantity 188, Subject 122632 of Worldwide Journal of Warmth and Mass Switch on June 1, 2022.

Determining Dynamic Changes in the Thermal Properties of Energy Storage Devices

Successfully managing the thermal properties of power storage gadgets is the important thing to avoiding thermal runaway and making certain security. Just lately, scientists from the Gwangju Institute of Science and Expertise uncovered key adjustments to the thermal properties of electrical double-layer capacitors throughout charging and discharging, which is able to assist inform future thermal administration methods. Credit score: Gwangju Institute of Science and Expertise (GIST)

The analysis workforce performed experiments each in situ (underneath static circumstances) and operando (throughout charging). They discovered that the temperatures of the constructive and unfavourable electrodes modified by 0.92% and 0.42% throughout charging, which corresponded to 9.14% and three.91% reductions of their respective Cp. “According to thermodynamic theory, the ionic configuration entropy (a measure of randomness) of a system decreases during adsorption, i.e., charging. This also affects the free energy of the system. Together, this leads to a decrease in Cp,” explains Prof. Seol.

The workforce additionally diversified the focus of the electrolyte, potassium hydroxide, to see the way it affected EDLC efficiency. They discovered that the EDLC displayed most capacitance and Cp discount when the electrolyte focus was 8 M. They attributed this to variations within the diploma of hydration of ions and their ionic mobility.

“An important aspect of this study is that charging and discharging also alters Cp of EDLCs,” says Prof. Seol. “These findings will extend our understanding of the underlying thermal physics of EDLCs.”

Certainly, these outcomes might be thought-about a significant step in direction of future efficient thermal administration methods, which is able to create safer and extra dependable power storage gadgets.

Reference: “In situ and operando thermal characterization in aqueous electric double layer capacitors using the 3ω hot-wire method” by Yeongcheol Park, Jaehoon Kim, Changho Kim, Seung-Mo Lee, Chul Kang and Jae Hun Seol, 5 February 2022, Worldwide Journal of Warmth and Mass Switch.
DOI: 10.1016/j.ijheatmasstransfer.2022.122632





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