biostudies-literatureWygant BRU.S. Department of Energy's National Nuclear Security AdministrationUnited States GovernmentSandia National LaboratoriesNational Technology and Engineering Solutions of SandiaHoneywell International, Inc.e2105803https://www.ebi.ac.uk/biostudies/studies/S-EPMC9036002biostudies-literatureUnknown9(12)FeF₃ conversion cathodes, paired with Li metal, are promising for use in next-generation secondary batteries and offer a remarkable theoretical energy density of 1947 Wh kg^-1 compared to 690 Wh kg^-1 for LiNi_0.5 Mn_1.5 O₄ ; however, many successful studies on FeF₃ cathodes are performed in cells with a large (>90-fold) excess of Li that disguises the effects of tested variables on the anode and decreases the practical energy density of the battery. Herein, it is demonstrated that for full-cell compatibility, the electrolyte must produce both a protective solid-electrolyte interphase and cathode-electrolyte interphase and that an electrolyte composed of 1:1.3:3 (m/m) LiFSI, 1,2-dimethoxyethane, and 1,1,2,2-tetrafluorAdvanced science (Weinheim, Baden-Wurttemberg, Germany)The Role of Electrolyte Composition in Enabling Li Metal-Iron Fluoride Full-Cell Batteries.PMC9036002DE-NA-0003525Harrison KLWygant BRMerrill LCTalin AALambert TNAshby DSfalseThe Role of Electrolyte Composition in Enabling Li Metal-Iron Fluoride Full-Cell Batteries.FeF₃ conversion cathodes, paired with Li metal, are promising for use in next-generation secondary batteries and offer a remarkable theoretical energy density of 1947 Wh kg^-1 compared to 690 Wh kg^-1 for LiNi_0.5 Mn_1.5 O₄ ; however, many successful studies on FeF₃ cathodes are performed in cells with a large (>90-fold) excess of Li that disguises the effects of tested variables on the anode and decreases the practical energy density of the battery. Herein, it is demonstrated that for full-cell compatibility, the electrolyte must produce both a protective solid-electrolyte interphase and cathode-electrolyte interphase and that an electrolyte composed of 1:1.3:3 (m/m) LiFSI, 1,2-dimethoxyethane, and 1,1,2,2-tetrafluor2022-01-01T00:00:00Z2022 Apr2025-04-04T22:17:07.974Z2025-04-04T22:17:07.974ZS-EPMC90360023519995310.1002/advs.202105803