Dynamic impedance spectroscopy of LiMn2O4 thin films made by multi-layer pulsed laser deposition
Veröffentlichungsdatum
2020-01-20
Zusammenfassung
The kinetics of the reversible insertion of lithium ions assisted by aqueous environment into thin film fabricated by multi-layer pulsed laser deposition is studied using dynamic multi-frequency analysis (DMFA). This method allowed us to acquire time resolved impedance spectra in the range of 210 kHz to 11.5 Hz during cyclic voltammetry. The impedance spectra obtained comprises of two RC time constants (semi-circles) indicating that the reversible insertion process of lithium ions in thin films in aqueous media follows a two-stage intercalation process with the first stage as the (de)solvation step of the lithium ions and the second stage as a (de)insertion process with a concurrent change in the oxidation state of manganese. The temporal development of the kinetic parameters with the state of charge during the voltage sweep was investigated and reported in this work.
Schlagwörter
LiMn2O4 thin films
;
Interfacial lithium ion transfer
;
Multi-layer pulse laser deposition
;
Multi-frequency analysis
;
Dynamic impedance spectroscopy
Institution
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Heft
331
Startseite
1
Endseite
16
Seitenzahl
16
Zweitveröffentlichung
Ja
Lizenz
Sprache
Englisch
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LMO.pdf
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1.68 MB
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Adobe PDF
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