Revealing an Intercalation Nature of High-Capacity Conversion Cathode Materials for Fluoride-Ion Batteries by Operando Studies.

ABSTRACT: To improve the performance of high-energy-density electrode materials for all-solid-state fluoride-ion batteries (ASSFIBs), it is important to understand the structure and phase evolution during operation, which is closely correlated to capacity fading. In this study, an operando cell is designed compatible with laboratory X-ray diffraction (XRD) to monitor real-time structural changes of bismuth trifluoride (BiF₃) cathodes and degradation of the ionic conductor BaSnF₄ under negative potentials at 100 °C. Supported by ex-situ XRD, our results reveal a multi-step defluorination of BiF₃: from orthorhombic (o-BiF₃) to cubic (c-BiF₃), then to distorted orthorhombic (o'-BiF₃), and finally to metallic bismuth (Bi), indicating part

SUBMITTER: Chen H 

PROVIDER: S-EPMC12391626 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature