Brownrigg, Alexander W., Mountjoy, Gavin, Chadwick, Alan V., Alfredsson, Maria, Bras, Wim, Billaud, Juliette, Armstrong, A. Robert, Bruce, Peter G., Dominko, Robert, Kelder, Erik M. and others. (2015) In situ Fe K-edge X-ray absorption spectroscopy study during cycling of Li\(_2\)FeSiO\(_4\) and Li\(_{2.2}\)Fe\(_{0.9}\)SiO\(_4\) Li ion battery materials. Journal of Materials Chemistry A, 3 (14). pp. 7314-7322. ISSN 2050-7488. E-ISSN 2050-7496. (doi:10.1039/c4ta06305h) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:49974)
The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. | |
Official URL: http://www.dx.doi.org/10.1039/c4ta06305h |
Abstract
In situ X-ray Absorption Spectroscopy (XAS) results are presented for Li\(_2\)FeSiO\(_4\) and Li\(_{2.2}\)Fe\(_{0.9}\)SiO\(_4\), promising cathode materials for lithium-ion batteries. The aims are to establish the valence and local structure of Fe during charge and discharge to understand if the Fe\(^{3+}\)/Fe\(^{4+}\) redox pair can be reached in the current battery design. It is found that the valence state changes between Fe\(^{2+}\) and Fe\(^{3+}\), with no evidence of Fe\(^{4+}\) before the onset of electrolyte degradation. There is a reversible contraction and extension of the Fe–O bond lengths during cycling while the Fe–Si distance remains constant, which underlines the stability of the Li\(_2\)FeSiO\(_4\) material. The same observations apply to Li\(_{2.2}\)Fe\(_{0.9}\)SiO4 cathode material indicating that changing the stoichiometry does not provide any additional structural stability.
Item Type: | Article |
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DOI/Identification number: | 10.1039/c4ta06305h |
Uncontrolled keywords: | Bond length, Cathodes, Electric batteries, Electrodes, Lithium, Lithium alloys, Lithium compounds, Secondary batteries, Stability, X ray absorption spectroscopy, Battery design, Cath-ode materials, Charge and discharge, Electrolyte degradations, In-situ X-ray absorption spectroscopy, Li-ion batteries, Local structure, Structural stabilities, Lithium-ion batteries |
Subjects: | Q Science > QD Chemistry > QD478 Solid State Chemistry |
Divisions: | Divisions > Division of Natural Sciences > Physics and Astronomy |
Depositing User: | Giles Tarver |
Date Deposited: | 03 Aug 2015 10:18 UTC |
Last Modified: | 17 Aug 2022 10:59 UTC |
Resource URI: | https://kar.kent.ac.uk/id/eprint/49974 (The current URI for this page, for reference purposes) |
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