Operando investigations of lithiation and delithiation processes in a BiVO4 anode material

BiVO4 undergoes a series of conversion and alloying reactions as an anode material in lithium ion batteries. The current work demonstrates a charge capacity of 485 mA h g−1 after 50 cycles in a voltage range of 0–2.00 V (graphite has a capacity of 372 mA h g−1 theoretically). An exceptionally high v...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2018, Vol.20 (47), p.29798-29803
Main Authors: Ruud, Amund, Sottmann, Jonas, Ponniah Vajeeston, Helmer Fjellvåg
Format: Article
Language:English
Subjects:
Anodes
Bismuth oxides
Density functional theory
Electrode materials
Graphite
Lithium
Lithium-ion batteries
Rechargeable batteries
Synchrotron radiation
Vanadates
X ray spectra
X-ray diffraction
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Summary:BiVO4 undergoes a series of conversion and alloying reactions as an anode material in lithium ion batteries. The current work demonstrates a charge capacity of 485 mA h g−1 after 50 cycles in a voltage range of 0–2.00 V (graphite has a capacity of 372 mA h g−1 theoretically). An exceptionally high volumetric capacity makes BiVO4 suitable for compact applications (volumetric capacity of 3984 mA h cm−3 for BiVO4 in comparison to 756 mA h 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 the V5+/V3+ and Bi0/Bi3− redox pairs. The proposed mechanisms are supported by density functional theory (DFT) calculations.
ISSN:1463-9076
1463-9084
DOI:10.1039/c8cp05330h