Nanoscale characteristics of practical LiFePO4 materials - Effects on electrical, magnetic and electrochemical properties
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49074449. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. |
Description
LiFePO4 (LFP) is one of the important commercial battery materials, as such, many efforts have been made to understand its electrical and ionic conductivities and electrochemical properties. In this study, we have investigated electrochemical, electrical and magnetic properties of carbon coated LFP down to cryogenic temperatures. The fact that the practical material really consists of a core-shell structure with a shell of delithiated material and carbon coating determines the measured properties, which are often mistakenly attributed to pure LFP core behaviour. An electronic resistivity drop (11 ± 0.5% based on the resistivity at room temperature), preceded by a gradual increase feature between 100 and 30 K, was observed when the temperature was below the Néel temperature at low applied currents, indicating a likely interaction between the magnetic configuration of the core LFP and electronic transport mechanisms. Metallic Fe3P was precipitated on the samples surfaces after annealing at high temperature in Argon. The existence of Fe3P was found to significantly improve the electronic conductivity but it took a toll on the electrochemical performance.
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ID Code: | 198098 | ||||
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Item Type: | Contribution to Journal (Journal Article) | ||||
Refereed: | Yes | ||||
ORCID iD: |
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Measurements or Duration: | 10 pages | ||||
Keywords: | Electronic conductivity, Lithium iron phosphate, Magnetic property, Surface characterization | ||||
DOI: | 10.1016/j.matchar.2020.110171 | ||||
ISSN: | 1044-5803 | ||||
Pure ID: | 49074449 | ||||
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 Current > Research Centres > Centre for Tropical Crops and Biocommodities |
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Funding Information: | Yin Zhang would like to acknowledge CSIRO for the studentship, and the involvement of CRRC and the Rail Manufacturing Cooperative Research Centre (funded jointly by participating rail organisations and the Australian Federal Government's Cooperative Research Centres Program). The experimental data reported in this paper were obtained at the Central Analytical Research Facility operated by the Institute for Future Environments, Queensland University of Technology (QUT), Brisbane, Australia. Computational resources and services used in this work were provided by the HPC and Research Support Group, QUT. The authors would like to acknowledge Mr. Llew Rintoul, QUT, for the assistance with Raman spectroscopy, and Dr. Mahboobeh Shahbazi, QUT, for the assistance with the magnetic property measurements. | ||||
Copyright Owner: | 2020 Published by Elsevier Inc. | ||||
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: | 27 Mar 2020 01:11 | ||||
Last Modified: | 15 Jul 2024 08:16 |
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