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Electrochemical properties of chromium oxyfluoride CrO2−xFx with 0 ≤ x ≤ 0.3

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Abstract

To overcome the limitations of graphite as a negative electrode material for lithium-ion batteries (LIBs), transition metal oxyfluorides are under active development. In this study, chromium oxyfluorides CrO2−xFx with 0 ≤ x ≤ 0.3 were synthesized under a high-pressure/high-temperature (HP/HT) environment, and their electrochemical properties were examined in a nonaqueous lithium cell. The HP/HT-treated CrO2 maintained a rutile structure and exhibited a rechargeable capacity (Qrecha) of over 400 mA h g−1 at 298 K. The replacement of O2− ions with F ions in CrO2 was confirmed by linear changes in the tetragonal lattice parameters, weaker ferromagnetic interactions between Cr4+ ions, and elemental mappings of F ions. The Qrecha values of the x > 0 samples at 298 K decreased to 150–300 mA h g−1 because of low electric conductivity in CrO2−xFx. However, the Qrecha values at 318 K increased to 600–700 mA h g−1, and the cycle performance over 30 cycles was better than that of the HP/HT-treated CrO2 sample with no F substitution. Hence, CrO2−xFx was found to be a promising negative electrode material for LIBs, although its cycle stability should be further improved.

Graphical abstract: Electrochemical properties of chromium oxyfluoride CrO2−xFx with 0 ≤ x ≤ 0.3

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Publication details

The article was received on 24 Jun 2019, accepted on 25 Sep 2019 and first published on 26 Sep 2019


Article type: Research Article
DOI: 10.1039/C9QI00765B
Inorg. Chem. Front., 2019, Advance Article
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    Electrochemical properties of chromium oxyfluoride CrO2−xFx with 0 ≤ x ≤ 0.3

    K. Mukai, T. Uyama and I. Yamada, Inorg. Chem. Front., 2019, Advance Article , DOI: 10.1039/C9QI00765B

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