Issue 35, 2023

An in situ dual-modification strategy for O3-NaNi1/3Fe1/3Mn1/3O2 towards high-performance sodium-ion batteries

Abstract

O3-type NaNi1/3Fe1/3Mn1/3O2 (NFM) is one of the most representative cathode materials with low cost and high capacity advantages. However, the sluggish diffusion kinetics and severe cathode–electrolyte interfacial reaction are serious roadblocks to commercialization. Hereby, a novel method of in situ V-modification is well-designed to play dual roles in reconstructing the crystal lattice and interface structure. Notably, the broadened layer spacing of O–Na–O and shortened TM–O bond are attributed to successful doping of V5+ into the bulk, accelerating the transmission of sodium ions and improving the structure stability. Concomitantly, the construction of a thin surface coating layer is beneficial for mitigating volume expansion and inhibiting structural degradation, which is validated by in situ X-ray diffraction coupled with the synchrotron X-ray absorption spectroscopy. Consequently, the rationally designed V-modified NFM cathode exhibits excellent cycling performances, exhibiting great capacity retention of 75.8% after 500 cycles at 2C in a half cell, and 85.6% capacity retention is observed after 150 cycles at 1C in the full cell. This work provides new insights into the development of O3-type layered oxide cathodes toward long-cycle life applications for large-scale energy storage systems.

Graphical abstract: An in situ dual-modification strategy for O3-NaNi1/3Fe1/3Mn1/3O2 towards high-performance sodium-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
21 Jun 2023
Accepted
09 Aug 2023
First published
22 Aug 2023

J. Mater. Chem. A, 2023,11, 18872-18880

An in situ dual-modification strategy for O3-NaNi1/3Fe1/3Mn1/3O2 towards high-performance sodium-ion batteries

N. Hong, J. Li, S. Guo, H. Han, H. Wang, X. Hu, J. Huang, B. Zhang, F. Hua, B. Song, N. Bugday, S. Yasar, S. Altin, W. Deng, G. Zou, H. Hou, Z. Long and X. Ji, J. Mater. Chem. A, 2023, 11, 18872 DOI: 10.1039/D3TA03640E

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