Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 1, Pages 406-412Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta08824b
Keywords
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Funding
- JST-Mirai Program, Japan [JPMJMI18E2]
- China Scholarship Council (CSC) [20180637020]
- Kyoto University
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This study investigates the properties of 3d transition metals on LaF3 substrates using thin-film cells, discovering the highly reversible (de)fluorinations of Cu, Co, and Ni at different temperatures and achieving high capacity utilizations at 150 degrees C. By combining XAS and electrochemical characterization results, the electrochemical behaviors of Cu, Co, and Ni, as well as the two-phase transition mechanism during the M/MF2 reaction, are reported for the first time, providing new insights for future cathode designs for use in all-solid-state FIBs.
Fluoride ion batteries (FIBs) are regarded as promising energy storage devices, and it is important and urgent to develop cathode materials with high energy densities for use in FIBs. However, systematic investigations of 3d transition metal/metal fluorides have been rarely reported thus far because of the restricted reversibility and unfavorable interfacial compatibility of 3d transition metal/metal fluorides with solid-state electrolytes. Herein, 3d transition metals are investigated by utilizing thin-film cells with LaF3 substrates. The highly reversible (de)fluorinations of Cu, Co, and Ni are validated at various temperatures. High capacity utilizations of 79.5%, 100%, and 90.5% are obtained during the initial cycle at 150 degrees C. By combining results from X-ray absorption spectroscopy (XAS) and electrochemical characterization, the electrochemical behaviors of Cu, Co, and Ni, as well as experimental evidence of the two-phase transition mechanism during the M/MF2 reaction are reported for the first time. This provides new insights required for future cathode designs for use in all-solid-state FIBs.
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