Issue 21, 2022

High rate capability achieved by reducing the miscibility gap of Na4−xMnV(PO4)3

Abstract

NASICON structured Na4MnV(PO4)3 has attracted great interest as a promising cathode for sodium-ion batteries due to its high theoretical capacity and working potential. However, it suffers from poor cycling stability and rate capability that originate from multi-phase transformations during sodiation/desodiation. In this work, the effect of synthesis conditions on the structural evolution, the reaction mechanism and the phase evolution of such electrode materials during sodiation/desodiation was investigated. The results indicate that the reaction mechanism depends on the grain size of Na4MnV(PO4)3. Specifically, reducing the grain size allows for an expanded solid solution region, which considerably improves the cycling stability and rate capability. Tuning the grain size can therefore improve the structural stability and kinetics of Na4MnV(PO4)3.

Graphical abstract: High rate capability achieved by reducing the miscibility gap of Na4−xMnV(PO4)3

Supplementary files

Article information

Article type
Research Article
Submitted
20 Qad 2022
Accepted
26 Leq 2022
First published
26 Leq 2022

Inorg. Chem. Front., 2022,9, 5454-5462

High rate capability achieved by reducing the miscibility gap of Na4−xMnV(PO4)3

A. Tang, W. Lin, D. Xiao, C. Shang, M. Yan, Z. Zhang, K. Aifantis and P. Hu, Inorg. Chem. Front., 2022, 9, 5454 DOI: 10.1039/D2QI01568D

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