2024-07-18 チャルマース工科大学
＜関連情報＞
- https://news.cision.com/chalmers/r/new-findings-could-lead-to-safer–more-stable-metal-batteries,c4012497
- https://iopscience.iop.org/article/10.1149/1945-7111/ad2593
カリウムめっきと剥離の電気化学的特徴 Electrochemical Signatures of Potassium Plating and Stripping
Josef Rizell, Wojciech Chrobak, Nataliia Mozhzhukhina, Shizhao Xiong and Aleksandar Matic
Journal of The Electrochemical Society Published: 13 February 2024
DOI:10.1149/1945-7111/ad2593
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Abstract
Alkali metal anodes can enable unmatched energy densities in next generation batteries but suffer from insufficient coulombic efficiencies. To deduce details about processes taking place during galvanostatic cycling, voltage profiles are commonly analyzed, however the interpretation is not straightforward as multiple processes can occur simultaneously. Here we provide a route to disentangle and interpret features of the voltage profile in order to build a mechanistic understanding on alkali metal stripping and deposition, by investigating potassium metal deposition as a model case where processes and reactions are exaggerated due to the high reactivity of potassium. In particular, the importance of separating SEI formation and nucleation to correctly estimate the energy barrier for nucleation is demonstrated. Further, we show how the native layer formed on alkali metal foils gives rise to strong features in the voltage profile and propose forming alkali metal electrode through electrodeposition to mitigate these effects.
