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Operando Investigations of Lithiation and Delithiation Processes in the BiVO4 Anode Material

Abstract

BiVO4 undergoes a series of conversion and alloying reactions as anode material in lithium ion batteries. The current work demonstrates a charge capacity of 485 mAh g-1 after 50 cycles in a voltage range of 0 – 2 V (graphite 372 mAh g-1 theoretically). An exceptionally high volumetric capacity makes BiVO4 suitable for compact applications (volumetric capacity of 3984 mAh cm-3 for BiVO4 in comparison to 756 mAh cm-3 for graphite theoretically). Reaction steps and electronic transformations have been identified by operando quasi simultaneous synchrotron x-ray diffraction and absorption spectroscopy studies. An irreversible reaction step occurs for the Bi3+/Bi0 redox pair, whereas reversible mechanisms are found for V5+/V3+ and Bi0/Bi3- redox pairs. The proposed mechanisms are supported by density functional theory (DFT) calculations.

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Publication details

The article was received on 21 Aug 2018, accepted on 09 Nov 2018 and first published on 09 Nov 2018


Article type: Paper
DOI: 10.1039/C8CP05330H
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Operando Investigations of Lithiation and Delithiation Processes in the BiVO4 Anode Material

    A. Ruud, J. Sottmann, P. Vajeeston and H. Fjellvåg, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP05330H

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