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Preparation of intergrown P/O-type biphasic layered oxides as high-performance cathodes for sodium ion batteries

Wang, K. 1; Wu, Z.-G.; Melinte, G. 2; Yang, Z.-G.; Sarkar, A. 1; Hua, W. 1; Mu, X. 1; Yin, Z.-W.; Li, J.-T.; Guo, X.-D.; Zhong, B.-H.; Kübel, C. ORCID iD icon 2,3
1 Karlsruher Institut für Technologie (KIT)
2 Helmholtz-Institut Ulm (HIU), Karlsruher Institut für Technologie (KIT)
3 Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)


This study reports on the solid-state synthesis and characterization of novel quaternary P/O intergrown biphasic Na$_{0.8}$MnyNi$_{0.8-y}$Fe$_{0.1}$Ti$_{0.1}$O$_{2}$ (y = 0.6, 0.55, 0.5, 0.45) cathode materials. Electrochemical tests reveal superior performance of the P/O biphasic materials in a sodium ion battery compared to the single P2 or O3 phases, proving the beneficial effect of the intergrowth of P2 and O3 materials. The nature of the P/O interface was studied by transmission electron microscopy. The analysis shows a semi-coherent interface grown along the a/b and c axes with local differences in the transition metal concentration along the interface between the two phases. EDX and EELS characterization revealed a charge compensation mechanism across the phase boundary based on variation of the transition element distribution, balancing the different sodium contents in the P and O phases. The results reported in this study provide a better understanding of P/O biphasic materials.

Verlagsausgabe §
DOI: 10.5445/IR/1000134270
Veröffentlicht am 26.06.2021
DOI: 10.1039/d1ta00627d
Zitationen: 26
Web of Science
Zitationen: 20
Zitationen: 24
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Karlsruhe Nano Micro Facility (KNMF)
Post Lithium Storage (POLiS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2050-7488, 2050-7496
KITopen-ID: 1000134270
HGF-Programm 43.31.01 (POF IV, LK 01) Multifunctionality Molecular Design & Material Architecture
Erschienen in Journal of Materials Chemistry A
Verlag Royal Society of Chemistry (RSC)
Band 9
Heft 22
Seiten 13151-13160
Nachgewiesen in Web of Science
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