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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

Valvo, Mario (author)
Uppsala universitet,Strukturkemi
Chien, Yu-Chuan, 1990- (author)
Uppsala universitet,Strukturkemi
Liivat, Anti (author)
Uppsala universitet,Strukturkemi
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Tai, Cheuk-Wai, 1973- (author)
Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm Univ, Dept Mat & Environm Chem, Arrhenius Lab, SE-10691 Stockholm, Sweden.
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 (creator_code:org_t)
Elsevier BV, 2023
2023
English.
In: Electrochimica Acta. - : Elsevier BV. - 0013-4686 .- 1873-3859. ; 440
  • Journal article (peer-reviewed)
Abstract Subject headings
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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.

Subject headings

NATURVETENSKAP  -- Kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences (hsv//eng)
NATURVETENSKAP  -- Kemi -- Materialkemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Materials Chemistry (hsv//eng)

Keyword

Conversion reactions
Metal nanoparticles
Capacitance
Size effects
Li-ion batteries

Publication and Content Type

ref (subject category)
art (subject category)

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