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Detecting voltage s...
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Valvo, MarioUppsala universitet,Strukturkemi
(författare)
Detecting voltage shifts and charge storage anomalies by iron nanoparticles in three-electrode cells based on converted iron oxide and lithium iron phosphate
- Artikel/kapitelEngelska2023
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Elsevier BV,2023
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printrdacarrier
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LIBRIS-ID:oai:DiVA.org:su-214857
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-214857URI
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https://doi.org/10.1016/j.electacta.2022.141747DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-496256URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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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.
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Chien, Yu-Chuan,1990-Uppsala universitet,Strukturkemi(Swepub:uu)yucch451
(författare)
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Liivat, AntiUppsala universitet,Strukturkemi(Swepub:uu)anlii367
(författare)
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Tai, Cheuk-Wai,1973-Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm Univ, Dept Mat & Environm Chem, Arrhenius Lab, SE-10691 Stockholm, Sweden.(Swepub:su)ctai
(författare)
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Uppsala universitetStrukturkemi
(creator_code:org_t)
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Ingår i:Electrochimica Acta: Elsevier BV4400013-46861873-3859
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