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Reversible Delithiation of Disordered Rock Salt LiVO 2
Author(s) -
Baur Christian,
Chable Johann,
Klein Franziska,
Chakravadhanula Venkata Sai Kiran,
Fichtner Maximilian
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201800189
Subject(s) - selected area diffraction , electrochemistry , materials science , salt (chemistry) , rietveld refinement , cathode , crystallography , diffraction , crystal structure , molten salt , diffusion , lattice (music) , chemistry , nanotechnology , electrode , metallurgy , thermodynamics , physics , optics , transmission electron microscopy , acoustics
A rigid crystal lattice, in which cations occupy specific positions, is generally regarded as a critical requirement to enable Li + diffusion in the bulk of conventional cathode materials, whereas disorder is generally considered as detrimental. Herein, we demonstrate that facile and reversible insertion and extraction of Li + is possible with LiVO 2 , a new cation‐disordered rock salt compound (space group: Fm 3 ‾ m ), which is, to the best of our knowledge, described for the first time. This new polymorph of LiVO 2 is synthesized by mechanical alloying. Rietveld refinements of the X‐ray diffractions patterns and SAED (selected‐area electron diffraction) patterns attested the formation of the disordered LiVO 2 rock salt phase. Galvanostatic cycling experiments were employed to characterize the electrochemical performance of the material, demonstrating that reversible cycling over 100 cycles with a discharge capacity around 100 mAh g −1 is possible.