20.500.12556/RUL-182578 On the interpretation of the impedance response of a passivated lithium metal anode The impedance response of passivated lithium metal anodes has been the subject of numerous studies. However, the exact significance of the main contribution – the mid-frequency arc due to the formation of the solid electrolyte interphase (SEI) - has not been satisfactorily explained. In particular, many studies have pointed to the existence of two closely coupled arcs – instead of one, which further complicates the interpretation. This study systematically investigates the possible underlying processes that determine the impedance characteristics of the SEI using four electrolytes with concentrations ranging from 1 M to 10− 4 M. The experimental results show that features attributed to processes in the electrolyte phase, such as migration and diffusion, scale significantly with concentration. However, the resistance associated with the coupled mid-frequency arc (the “SEI arc”) shows a modest increase, challenging conventional hypotheses. A novel two-dimensional transmission line model is introduced to account for the heterogeneous topology of the SEI and to capture the interplay of liquid and solid phases. The model accurately describes the observed trends over the entire concentration range and reveals the crucial influence of the SEI on the overall impedance. This work provides new insights into the structure-function relationships of the SEI and highlights the need for topology-aware modeling to understand lithium metal anodes. lithium metal solid electrolyte interface impedance spectroscopy electrolyte concentration electrolyte composition 2D impedance model equivalent circuit kemijska tehnologija materiali litij kovine anode true false true Angleški jezik Slovenski jezik Članek v reviji 2026-05-18 09:18:03 2026-05-18 09:18:04 2026-05-19 04:36:15 0000-00-00 00:00:00 2025 0 0 8 str. art. 116987 Vol. 429 Oct. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 66 1872-7689 10.1016/j.ssi.2025.116987 265309699 1-s2.0-S0167273825002061-main.pdf 1-s2.0-S0167273825002061-main.pdf 1 001DCC008719C52D23D7965D243817E1 0c7d6034e0cd91343061954ab1f38966f15ef5248caf9c9055a4d79bebff1768 b703d1d0-5289-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=233957 https://www.sciencedirect.com/science/article/pii/S0167273825002061 1 66319aab-5289-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=233956 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0