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Detecting voltage shifts and charge storage anomalies by iron nanoparticles in three-electrode cells based on converted iron oxide and lithium iron phosphate
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0001-7286-1211
Number of Authors: 42023 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 440, article id 141747Article in journal (Refereed) Published
Abstract [en]

Noticeable voltage shifts have been observed in the charge/discharge profiles of a three-electrode cell with a lithium metal reference electrode and having a deeply lithiated iron oxide (Fe/Li2O) negative electrode galvanostatically cycled in a limited potential range against a positive LiFePO4 counterpart. The origin of such shifts has been attributed to charge storage anomalies in the Fe/Li2O nanocomposite due to characteristic reduced Fe nanoparticle sizes. These shifts also affected the extreme points of the voltage profiles of the positive electrode, which was also independently monitored. A combined evaluation of voltage profile slippages with possible changes in internal resistance and/or Li+ inventory loss, including an aimed analysis of current interruptions at the end of each lithiation/de-lithiation half-cycle to monitor the internal resistance and diffusion resistance coefficient of the Fe/Li2O electrode, has enabled a clarification of its altered charge storage. An asymmetric behaviour of the Fe/Li2O electrode during Li+ uptake/release has been revealed, highlighting a progressive, diffusion-controlled-type voltage drift at low potentials vs. Li+/Li, and an unusual tendency to slight oxidation with capacitive variations during the reverse electrochemical processes at higher voltages, instead.

Place, publisher, year, edition, pages
2023. Vol. 440, article id 141747
Keywords [en]
Conversion reactions, Metal nanoparticles, Capacitance, Size effects, Li-ion batteries
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-214857DOI: 10.1016/j.electacta.2022.141747ISI: 000916016500001Scopus ID: 2-s2.0-85144604440OAI: oai:DiVA.org:su-214857DiVA, id: diva2:1741503
Available from: 2023-03-06 Created: 2023-03-06 Last updated: 2023-03-06Bibliographically approved

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Tai, Cheuk-Wai

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