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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
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).ORCID-id: 0000-0001-7286-1211
Rekke forfattare: 42023 (engelsk)Inngår i: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 440, artikkel-id 141747Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2023. Vol. 440, artikkel-id 141747
Emneord [en]
Conversion reactions, Metal nanoparticles, Capacitance, Size effects, Li-ion batteries
HSV kategori
Identifikatorer
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
Tilgjengelig fra: 2023-03-06 Laget: 2023-03-06 Sist oppdatert: 2023-03-06bibliografisk kontrollert

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Tai, Cheuk-Wai

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