Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 22, Pages 13151-13160Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta00627d
Keywords
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Funding
- National Natural Science Foundation of China [21878195, 21805198]
- Distinguished Young Scholars of Sichuan University [2017SCU04A08]
- Research Foundation for the Postdoctoral Program of Sichuan University [2017SCU12018, 2018SCU12045]
- Karlsruhe Nano Micro Facility (KNMF)
- Chinese Scholarship Council [201706240159]
- German Research Foundation (DFG) [390874152]
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This study reports on the synthesis and characterization of novel quaternary P/O intergrown cathode materials and reveals their superior performance in a sodium ion battery. The nature of the P/O interface was studied by transmission electron microscopy, showing a semi-coherent interface grown along the a/b and c axes with local differences in transition metal concentration. EDX and EELS characterization revealed a charge compensation mechanism based on variation of transition element distribution across the phase boundary.
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.
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