Issue 13, 2023

Unlocking fast and highly reversible sodium storage in Fe-based mixed polyanion cathodes for low-cost and high-performance sodium-ion batteries

Abstract

The iron-based polyanionic material Na3Fe2(PO4)P2O7 is regarded as an excellent cathode due to its outstanding thermal stability and the three-dimensional (3D) open framework structure with facile sodium-ion transport. However, its inferior electronic conductivity and limited diffusion kinetics deteriorate its rate performance and cyclability. Herein, a rationally designed Ni doping strategy in Na3Fe2(PO4)P2O7 is developed to stabilize the crystal structure and to expand the migration path of Na+. The as-prepared cathode can exhibit a discharge capacity reaching 100.7 mA h g−1 at 0.1C and excellent cycling stability throughout 5000 cycles at 10C. Moreover, it maintains impressive high-temperature sodium storage behavior with negligible capacity degradation after 200 cycles at 1C and 60 °C. A highly reversible single-phase structural evolution is disclosed by in situ X-ray diffraction. Furthermore, the fast ionic/electronic diffusion kinetics is revealed through various electrochemical measurements and density functional theory calculations.

Graphical abstract: Unlocking fast and highly reversible sodium storage in Fe-based mixed polyanion cathodes for low-cost and high-performance sodium-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
02 Jan 2023
Accepted
13 Feb 2023
First published
14 Feb 2023

J. Mater. Chem. A, 2023,11, 6978-6985

Unlocking fast and highly reversible sodium storage in Fe-based mixed polyanion cathodes for low-cost and high-performance sodium-ion batteries

X. Wang, H. Li, W. Zhang, X. Ge, L. He, L. Zhang, S. Li, N. Wen, J. Guo, Y. Lai, S. Li and Z. Zhang, J. Mater. Chem. A, 2023, 11, 6978 DOI: 10.1039/D3TA00014A

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