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Layered P2-Na$_x$Mn$_{3/4}$Ni$_{1/4}$O$_2$ Cathode Materials For Sodium-Ion Batteries: Synthesis, Electrochemistry and Influence of Ambient Storage

Pfeiffer, Lukas Fridolin; Jobst, Nicola; Gauckler, Cornelius; Lindén, Mika; Marinaro, Mario; Passerini, Stefano 1; Wohlfahrt-Mehrens, Margret; Axmann, Peter
1 Helmholtz-Institut Ulm (HIU), Karlsruher Institut für Technologie (KIT)


Sodium-ion batteries promise efficient, affordable and sustainable electrical energy storage that avoids critical raw materials such as lithium, cobalt and copper. In this work, a manganese-based, cobalt-free, layered Na$_x$Mn$_{3/4}$Ni$_{1/4}$O$_2$ cathode active material for sodium-ion batteries is developed. A synthesis phase diagram was developed by varying the sodium content x and the calcination temperature. The calcination process towards a phase pure P2-Na$_{2/3}$Mn$_{3/4}$Ni$_{1/4}$O$_2$ material was investigated in detail using in-situ XRD and TGA-DSC-MS. The resulting material was characterized with ICP-OES, XRD and SEM. A stacking fault model to account for anisotropic broadening of (10l) reflexes in XRD is presented and discussed with respect to the synthesis process. In electrochemical half-cells, P2-Na$_{2/3}$Mn$_{3/4}$Ni$_{1/4}$O$_2$ delivers an attractive initial specific discharge capacity beyond 200 mAh g−1, when cycled between 4.3 and 1.5 V. The structural transformation during cycling was studied using operando XRD to gain deeper insights into the reaction mechanism. The influence of storage under humid conditions on the crystal structure, particle surface and electrochemistry was investigated using model experiments. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000148679
Veröffentlicht am 14.07.2022
DOI: 10.3389/fenrg.2022.910842
Zitationen: 13
Zitationen: 14
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Post Lithium Storage (POLiS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2296-598X
KITopen-ID: 1000148679
HGF-Programm 38.02.03 (POF IV, LK 01) Batteries in Application
Erschienen in Frontiers in Energy Research
Verlag Frontiers Media SA
Band 10
Seiten Art.-Nr.: 910842
Vorab online veröffentlicht am 24.05.2022
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