Alkaline Earth Bismuth Fluorides as Fluoride-Ion Battery Electrolytes
Fluoride-ion batteries have several potential advantages over lithium-ion batteries. Materials development is still needed, however, to realize electrolytes with sufficiently high anion conductivity and compatibility with anode and cathode layers. Fluoride compounds are difficult to synthesize directly as single crystals but can be realized from oxide film precursors via topotactic chemistry techniques. Here, we create crystalline alkaline earth bismuth fluoride films BaBiF<sub>5</sub> and SrBiF<sub>5</sub> through oxide molecular beam epitaxy and topotactic fluorination. We characterize their ionic conductivities and demonstrate their potential as electrolytes. Finally, we realize epitaxial synthesis of BaBiF<sub>5</sub> on BaF<sub>2</sub> substrates, providing a route to thin film fluoride-ion battery devices.
Authors
- Spencer Doyle (ORCID: https://orcid.org/0000-0002-6596-8683)
- Julia A. Mundy (ORCID: https://orcid.org/0000-0001-8454-0124)
- Peichao Zou (ORCID: https://orcid.org/0000-0003-0148-7482)
- Ari B. Turkiewicz (ORCID: https://orcid.org/0000-0001-5729-0289)
- Huolin L. Xin (ORCID: https://orcid.org/0000-0002-6521-868X)
- Charles M. Brooks (ORCID: https://orcid.org/0000-0001-9087-7321)
- Yang Zhang (ORCID: https://orcid.org/0000-0002-5634-4297)
- Edvin Tewolde Berhane
- Ismail El Baggari
Institutions
- Harvard University (US)
- University of California, Irvine (US)
- Harvard University Press (US)
Publication Details
- Journal
- ACS Omega
- Published
- 2024-09-02
- DOI
- https://doi.org/10.1021/acsomega.4c05872
- Citations
- 2
- Primary Topic
- Inorganic Fluorides and Related Compounds
- Type
- article
- Field-Weighted Citation Impact
- 0.32
Funders
- National Science Foundation
- David and Lucile Packard Foundation
- Gordon and Betty Moore Foundation
- Harvard University
- University of California, Irvine
- Division of Materials Research
- Division of Graduate Education
- Division of Electrical, Communications and Cyber Systems