Abstract
Solid-electrolyte interphase (SEI) films forming at the surface of anode electrodes are known as one of the crucial aspects that decide battery performance in most advanced battery technologies. For these films to be effective, ion transport and electron transport need to have specific properties. However, due to the difficulties accessing the dynamic character of SEI formation and evolution, little is known about these properties. Moreover, special multimodal techniques are needed to characterize the in situ behavior. Developing and designing these multimodal techniques with acceptable levels of control and reproducibility is a challenge. Here, using theory and computation, we focus on specific aspects of ion motion and charge transfer through a 1-nm-thick Li2S crystalline SEI obtaining important new insights regarding ion transport through nascent SEIs. Our study reveals that spontaneous ion hopping is the dominant mechanism for the motion of Li ions through a thin Li2S SEI located on top of Li metal. Simultaneously, charge transfer driven by the formation of a new Li2S layer due to reduction of a Li2S8 molecule from the electrolyte phase acts as a trigger of the ion transport process. Fluctuating charge transfer evolution appears as an exchange between pairs of metal layers, with maximum amplitudes observed at interfacial charge transfer through the Li metal/SEI interface.
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Funding
This work was supported by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the US Department of Energy through the Advanced Battery Materials Research (BMR) Program (Battery500 Consortium phase 2) under DOE contract No. DE-AC05-76RL01830 from the Pacific Northwest National Laboratory (PNNL). Computational resources from the Texas A&M University High Performance Research Computing are gratefully acknowledged.
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We dedicate this paper to Prof. Doron Aurbach, for his extraordinary contributions to the understanding of battery materials and devices.
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Angarita-Gomez, S., Balbuena, P.B. Ion motion and charge transfer through a solid-electrolyte interphase: an atomistic view. J Solid State Electrochem 26, 1931–1939 (2022). https://doi.org/10.1007/s10008-022-05227-6
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DOI: https://doi.org/10.1007/s10008-022-05227-6