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Influence of Vacancies in Manganese Hexacyanoferrate Cathode for Organic Na‐Ion Batteries: A Structural Perspective

Li, Min; Gaboardi, Mattia; Mullaliu, Angelo 1; Maisuradze, Mariam; Xue, Xilai 1; Aquilanti, Giuliana; Rikkert Plaisier, Jasper; Passerini, Stefano 1; Giorgetti, Marco
1 Helmholtz-Institut Ulm (HIU), Karlsruher Institut für Technologie (KIT)

Abstract:

Manganese hexacyanoferrates (MnHCF) are promising positive electrode materials for non-aqueous batteries, including Na-ion batteries, due to their large specific capacity (>130 mAh g$^{–1}$), high discharge potential and sustainability. Typically, the electrochemical reaction of MnHCF associates with phase and structural changes, due to the Jahn-Teller (JT) distortion of Mn sites upon the charge process. To understand the effect of the MnHCF structure on its electrochemical performance, two MnHCF materials with different vacancies content are investigated herein. The electrochemical results show that the sample with lower vacancy content (4 %) exhibits relatively higher capacity retention of 99.1 % and 92.6 % at 2$^{nd}$ and 10$^{th}$ cycles, respectively, with respect to 97.4 % and 79.3 % in sample with higher vacancy content (11 %). Ex-situ X-ray absorption spectroscopy (XAS) and ex situ X-ray diffraction (XRD) characterization results show that a weaker cooperative JT-distortion effect and relatively smaller crystal structure modification occurred for the material with lower vacancies, which explains the better electrochemical performance in cycled electrodes.


Verlagsausgabe §
DOI: 10.5445/IR/1000158499
Veröffentlicht am 10.05.2023
Originalveröffentlichung
DOI: 10.1002/cssc.202300201
Scopus
Zitationen: 3
Web of Science
Zitationen: 3
Dimensions
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 1864-5631, 1864-564X
KITopen-ID: 1000158499
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in ChemSusChem
Verlag Wiley-VCH Verlag
Band 16
Heft 12
Seiten Art.-Nr.: e202300201
Vorab online veröffentlicht am 19.04.2023
Nachgewiesen in Scopus
Dimensions
Web of Science
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