Issue 22, 2021

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

Abstract

This study reports on the solid-state synthesis and characterization of novel quaternary P/O intergrown biphasic Na0.8MnyNi0.8−yFe0.1Ti0.1O2 (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.

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

Supplementary files

Article information

Article type
Paper
Submitted
22 Jan 2021
Accepted
22 Apr 2021
First published
05 May 2021
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. A, 2021,9, 13151-13160

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

K. Wang, Z. Wu, G. Melinte, Z. Yang, A. Sarkar, W. Hua, X. Mu, Z. Yin, J. Li, X. Guo, B. Zhong and C. Kübel, J. Mater. Chem. A, 2021, 9, 13151 DOI: 10.1039/D1TA00627D

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