Tuesday, 11 October 2022: 17:00
Room 215 (The Hilton Atlanta)
Solid-state electrochemical cells may undergo significant chemical potential changes in the electrolyte region near the electrodes, depending on operating conditions. Lithium dendrite growth, which may eventually induce mechanical stresses and short circuit in all-solid-state batteries (SSBs) in the charging process, is one of the well-known examples representing chemo-mechanical failure in solid-state electrochemical cells [1, 2]. A similar phenomenon has been observed in solid oxide cells (SOCs) operated in electrolysis mode and also in fuel cell mode with a negative voltage [3, 4]. Contrary to lithium precipitation in SSBs, high partial pressure of oxygen is developed in SOCs, resulting in electrode/electrolyte delamination. In the present study, we investigated the mechanism of delamination growth in SOCs with respect to operating conditions, based on which we determined a critical factor correlated to mechanical failure. This study provides basic understanding and critical insights into the chemo-mechanical failure mechanism of SOCs with respect to operating conditions.
References
[1] S. Ohno, R. Koerver, G. Dewald, C. Rosenbach, P. Titscher, D. Steckermeier, A. Kwade, J. Janek, W.G. Zeier, Chem. Mater., 31 (8) (2019), pp. 2930-2940
[2] M. Otoyama, M. Suyama, C. Hotehama, H. Kowada, Y. Takeda, K. Ito, A. Sakuda, M. Tatsumisago, A. Hayashi, ACS Appl. Mater. Interfaces, 13 (4) (2021), pp. 5000-5007
[3] H.-T. Lim, A.V. Virkar, J. Power Sources, 185 (2008), pp. 790-800
[4] B.-K. Park, Q. Zhang, P.W. Voorhees, S.A. Barnett, Energy Environ. Sci., 12 (2019), pp. 3053-3062