Dynamic impedance spectroscopy of LiMn2O4 thin films made by multi-layer pulsed laser deposition
The kinetics of the reversible insertion of lithium ions assisted by aqueous environment into LiMn2O4 thin film fabricated by multi-layer pulsed laser deposition is studied using dynamic multi-frequencyanalysis (DMFA). This method allowed us to acquire time resolved impedance spectra in the range of...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/231391 |
| Acceso en línea: | http://hdl.handle.net/10261/231391 |
| Access Level: | acceso abierto |
| Palabra clave: | LiMn2O4 thin films Interfacial lithium ion transfer Multi-layer pulse laser deposition Multi-frequency analysis Dynamic impedance spectroscopy |
| Sumario: | The kinetics of the reversible insertion of lithium ions assisted by aqueous environment into LiMn2O4 thin film fabricated by multi-layer pulsed laser deposition is studied using dynamic multi-frequencyanalysis (DMFA). This method allowed us to acquire time resolved impedance spectra in the range of210 kHz to 11.5 Hz during cyclic voltammetry. The impedance spectra obtained comprises of two RC timeconstants (semi-circles) indicating that the reversible insertion process of lithium ions in LiMn2O4 thinfilms in aqueous media follows a two-stage intercalation process with the first stage as the (de)solvationstep of the lithium ions and the second stage as a (de)insertion process with a concurrent change in theoxidation state of manganese. The temporal development of the kinetic parameters with the state ofcharge during the voltage sweep was investigated and reported in this work. |
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