Observation of Preferential Cation Doping on the Surface of LiFePO4Particles and Its Effect on Properties
Description
<p>This study investigates a series of cation dopants for LiFePO4 that are reported to be beneficial for rate performance. A solid-state synthesis has been used to be consistent with a common processing method used in prior doping investigations and in commercial processes for this compound. Increased ratios of Fe3+/Fe2+ oxidation on the particle surfaces have been determined using X-ray photoelectron spectroscopy (XPS) and soft X-ray absorption spectroscopy (sXAS) for the doped LiFePO4, for all chosen dopants and valences (<, = or >2+), while the cores remain much closer to the characteristics of the pristine (undoped) material. These results indicate that the dopants are predominantly pushed to the particle surfaces during phase formation, even when the dopants are added at the initial fine mixing of precursors. The differential distribution of dopants between the cores and surface layers of the particles results in conductivity improvements and reduction of polarizations in electrochemical impedance spectroscopy measurements of the doped LiFePO4. </p>
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| ID Code: | 208679 | ||||
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| Item Type: | Contribution to Journal (Journal Article) | ||||
| Refereed: | Yes | ||||
| ORCID iD: |
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| Additional Information: | Funding Information: Y.Z. acknowledges CSIRO for the studentship, and the involvement of CRRC and the Rail Manufacturing Cooperative Research Center (funded jointly by participating rail organizations and the Australian Federal Government’s Cooperative Research Centers Program). The experimental data reported in this paper were obtained from the Central Analytical Research Facility operated by the Institute for Future Environments, Queensland University of Technology (QUT), Brisbane, Australia. The authors acknowledge Mr. Michael Jones, QUT, for the assistance with the proposal for Australian Synchrotron beamline application and the Australian Synchrotron for the awarded beamtime. Critical reading of the manuscript by Prof. Ian Mackinnon is gratefully acknowledged. | ||||
| Measurements or Duration: | 10 pages | ||||
| Keywords: | density functional theory, doping, electrochemical impedance spectroscopy, lithium iron phosphate, soft X-ray absorption spectroscopy, surface characterization | ||||
| DOI: | 10.1021/acsaem.0c01536 | ||||
| ISSN: | 2574-0962 | ||||
| Pure ID: | 75952581 | ||||
| Divisions: | Current > Research Centres > Centre for Materials Science Current > Research Centres > Centre for Clean Energy Technologies & Practices Past > Institutes > Institute for Future Environments Past > QUT Faculties & Divisions > Science & Engineering Faculty Current > QUT Faculties and Divisions > Faculty of Science Current > Schools > School of Chemistry & Physics |
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| Funding Information: | Y.Z. acknowledges CSIRO for the studentship, and the involvement of CRRC and the Rail Manufacturing Cooperative Research Center (funded jointly by participating rail organizations and the Australian Federal Government’s Cooperative Research Centers Program). The experimental data reported in this paper were obtained from the Central Analytical Research Facility operated by the Institute for Future Environments, Queensland University of Technology (QUT), Brisbane, Australia. The authors acknowledge Mr. Michael Jones, QUT, for the assistance with the proposal for Australian Synchrotron beamline application and the Australian Synchrotron for the awarded beamtime. Critical reading of the manuscript by Prof. Ian Mackinnon is gratefully acknowledged. | ||||
| Copyright Owner: | 2020 American Chemical Society | ||||
| Copyright Statement: | This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au | ||||
| Deposited On: | 10 Mar 2021 01:08 | ||||
| Last Modified: | 16 Jun 2024 21:37 |
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