Improved Compatibility of α-NaMnO 2 Cathodes at the Interface with Ionic Liquid Electrolytes.

Autor: Maresca G; TERIN-DEC-ACEL Technical Unit, ENEA, Via Anguillarese 301, 00123, Rome, Italy.; Department of Basic and Applied Sciences of Engineering, La Sapienza University of Rome, Piazzale Aldo Moro 5, 00185, Rome, Italy., Ottaviani M; Department of Chemical Sciences and Bernal Institute, University of Limerick, V94 T9PX, Limerick, Ireland.; Department of Physics, University of Limerick, V94 T9PX, Limerick, Ireland., Ryan KM; Department of Chemical Sciences and Bernal Institute, University of Limerick, V94 T9PX, Limerick, Ireland., Brutti S; Department of Chemistry, La Sapienza University of Rome, Piazzale Aldo Moro 5, 00185, Rome, Italy., Appetecchi GB; TERIN-DEC-ACEL Technical Unit, ENEA, Via Anguillarese 301, 00123, Rome, Italy.
Jazyk: angličtina
Zdroj: ChemSusChem [ChemSusChem] 2024 Nov 11; Vol. 17 (21), pp. e202400514. Date of Electronic Publication: 2024 Jun 10.
DOI: 10.1002/cssc.202400514
Abstrakt: The behaviour and compatibility of monoclinic sodium manganite, α-NaMnO 2 , cathodes at the interface with electrolytes based on the 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMIFSI) and N-trimethyl-N-butylammonium bis(fluorosulfonyl)imide (N 1114 FSI) ionic liquids is presented and discussed. The Na + insertion process was analysed through cyclic voltammetry tests combined with impedance spectroscopy measurements and the cell performance was tested by charge-discharge cycles. XPS and FIB-SEM measurements allowed analysis of the surface composition and the morphology of post-mortem cathodes. Overall, the α-NaMnO 2 cathode showed high reversibility in N 1114 FSI-based electrolyte, delivering 60 % of the initial capacity after 1200 cycles in conjunction with a Coulombic efficiency above 99 %. To our knowledge, these very promising results are the best result obtained till now for monolithic α-NaMnO 2 cathodes, are ascribable to the formation of a stable passive layer onto the electrode surface, as confirmed by spectroscopic analysis.
(© 2024 Wiley-VCH GmbH.)
Databáze: MEDLINE
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