20.500.12556/DiRROS-16910 Entering voltage hysteresis in phase-separating materials revealing the electrochemical signature of the intraparticle phase-separated state Hysteresis is a general phenomenon regularly observed in various materials. Usually, hysteretic behavior is an intrinsic property that cannot be circumvented in the non-equilibrium operation of the system. Herein, we show that, at least with regard to the hysteretic behavior of phase-separating battery materials, it is possible to enter (deeply) the hysteretic loop at finite battery currents. This newly observed electric response of the electrode, which is inherent to phase-separating materials, is, for the first time, related to its microscopic origin arising from a (significant) share of the active material residing in an intraparticle phase-separated state. This intriguing observation was further generalized by revealing that a phase-separating material can feature (significantly) different chemical potentials at the same bulk lithiation level and temperature when exposed to the same finite current and external voltage hysteresis. Therefore, the intraparticle phase-separated state significantly affected the DC and AC characteristics of the battery. The experimental evidence for entering the intraparticle phase-separated state is supported by thermodynamic reasoning and advanced modeling. The current findings will help advance the understanding, control, diagnostics, and monitoring of batteries composed of phase-separating materials while also providing pertinent motivation for the enhancement of battery design and performance. battery phase-separating materials Lithium iron phosphate voltage hysteresis intraparticle phase-separated materiali li-ionska baterija material s frazno separacijo vstop v napetostno histerezo frazno separirano stanje true false true Wiley-VCH Advanced Materials Angleški jezik Slovenski jezik © 2023 The Authors. Neznano 2023-09-06 08:23:14 2023-09-06 08:37:00 2023-09-07 03:36:59 0000-00-00 00:00:00 2023 0 0 Nasl. z nasl. zaslona; Opis vira z dne 5. 9. 2023; str. 1-18 iss. 31, article no. 2210937 Vol. 35 Aug. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2023-08-01 621.352 1521-4095 10.1002/adma.202210937 151199235 https://onlinelibrary.wiley.com/doi/10.1002/adma.202210937 1 06236353-4c6d-11ee-8cc8-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=22986 RAZ_Katrasnik_Tomaz_2023.pdf RAZ_Katrasnik_Tomaz_2023.pdf 1 D89094565C1A7EE8FD24019928EB67E7 e30cb602fb6079593ef5e2c6a37b2b708872c6ee2989b8e156f3c0d4cd639aee b4fefdef-4c6e-11ee-8cc8-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=22987 Kemijski inštitut 0 0 0