20.500.12556/RUL-156288 Enhanced performance of lithium metal batteries via cyclic fluorinated ether based electrolytes To address the challenges associated with applying high-voltage cathodes in lithium metal batteries (LMBs) there is a need for new electrolytes enabling stable interphases at both electrodes. Here we attack this by using a dioxolane-derived cyclic fluorinated ether, 2,2-bis(trifluoromethyl)-1,3-dioxolane (BTFD), as a fluorinated diluent to a 1,2-dimethoxyethane (DME) based electrolyte. The cells using the resulting BTFD-based electrolytes exhibit higher Coulombic efficiencies for lithium stripping and plating as compared to those using the non-fluorinated ether-based electrolyte. This originates from the reduced formation of ‘dead Li’ at the anode, as shown by using electrochemical impedance spectroscopy (EIS). In practice, the BTFD-based electrolytes are shown to improve the performance of Li||NMC cells, which is due to the formation of a predominantly inorganic cathode electrolyte interphase (CEI) that suppresses the cathode degradation during cycling. We used X-ray photoelectron spectroscopy (XPS) and scanning transmission electron microscopy (STEM) to characterize the CEIs’ overall composition and structure. To obtain more details on the CEI speciation, Raman and nuclear magnetic resonance (NMR) spectroscopies were employed, assisted by molecular level computations. Overall, we demonstrate how the very design of the electrolyte composition influences the performance of LMBs. lithium metal batteries high-voltage cathode fluorinated electrolyte locally highly concentrated electrolyte solvation structure elektrokemija akumulatorji baterije elektroliti fluoridi true false true Angleški jezik Slovenski jezik Članek v reviji 2024-05-17 10:06:33 2024-05-17 10:06:34 2024-05-18 04:07:15 0000-00-00 00:00:00 2024 0 0 10 str. Vol. 69, art. 103375 May 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544.5/.6 2405-8289 10.1016/j.ensm.2024.103375 193555203 1-s2.0-S2405829724002022-main.pdf 1-s2.0-S2405829724002022-main.pdf 1 19AF085482AFF17F20C8D414C731A246 d8cb1488dad0fa8a90740bcb4a1b837da3d2439c5e371a7a948fd9ea7a5b2fa7 d0a749d0-1424-11ef-832b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183672 https://www.sciencedirect.com/science/article/pii/S2405829724002022 1 60757726-1424-11ef-832b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=183671 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0