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Issue 26, 2015
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Li+ intercalation in isostructural Li2VO3 and Li2VO2F with O2− and mixed O2−/F anions

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Abstract

Mixed-anion materials for Li-ion batteries have been attracting attention in view of their tunable electrochemical properties. Herein, we compare two isostructural (Fm[3 with combining macron]m) model intercalation materials Li2VO3 and Li2VO2F with O2− and mixed O2−/F anions, respectively. Synchrotron X-ray diffraction and pair distribution function data confirm large structural similarity over long-range and at the atomic scale for these materials. However, they show distinct electrochemical properties and kinetic behaviour arising from the different anion environments and the consequent difference in cationic electrostatic repulsion. In comparison with Li2VO3 with an active V4+/5+ redox reaction, the material Li2VO2F with oxofluoro anions and the partial activity of V3+/5+ redox reaction favor higher theoretical capacity (460 mA h g−1vs. 230 mA h g−1), higher voltage (2.5 V vs. 2.2 V), lower polarization (0.1 V vs. 0.3 V) and faster Li+ chemical diffusion (∼10−9 cm2 s−1vs. ∼10−11 cm2 s−1). This work not only provides insights into the understanding of anion chemistry, but also suggests the rational design of new mixed-anion battery materials.

Graphical abstract: Li+ intercalation in isostructural Li2VO3 and Li2VO2F with O2− and mixed O2−/F− anions

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Supplementary files

Article information


Submitted
29 Apr 2015
Accepted
08 Jun 2015
First published
08 Jun 2015

This article is Open Access

Phys. Chem. Chem. Phys., 2015,17, 17288-17295
Article type
Paper
Author version available

Li+ intercalation in isostructural Li2VO3 and Li2VO2F with O2− and mixed O2−/F anions

R. Chen, S. Ren, M. Yavuz, A. A. Guda, V. Shapovalov, R. Witter, M. Fichtner and H. Hahn, Phys. Chem. Chem. Phys., 2015, 17, 17288
DOI: 10.1039/C5CP02505B

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