All-climate and air-stable NASICON-Na2TiV(PO4)3 cathode with three-electron reaction toward high-performance sodium-ion batteries
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Article number | 133542 |
Journal / Publication | Chemical Engineering Journal |
Volume | 433 |
Issue number | Part 2 |
Online published | 13 Nov 2021 |
Publication status | Published - 1 Apr 2022 |
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Abstract
Developing all-climate and air-stable cathode with multi-electron redox reaction is intriguing and challenging for sodium-ion batteries (SIBs). Herein, we synthesize a NASICON (Na super-ionic conductor)-type Na2TiV(PO4)3 with an elaborately-engineered architecture, which shows ultrastable (1000 cycles at 40C) and ultrafast (up to 40C) three-sodium storage performances with an ultrahigh capacity of 187 mA h g−1 (equals to theoretical value) at 0.1C. Also, it displays good air-stability and high/low-temperature properties. A series of stepwise solid-solution, two-phase, solid-solution and two-phase mechanisms are involved and a small volume change of 4.9% is identified according to the operando X-ray diffraction results. Ex situ X-ray photoelectron spectroscopy reveals that V4+/V3+, Ti4+/Ti3+ and V3+/V2+ redox reactions are accompanied with three-sodium storage processes. The small band gap of 1.48 eV and fast 3D Na+ diffusion pathways with low energy barrier of 0.2 eV calculated through first-principles calculations are responsible for the superior electrochemical performances. Our work prepares Na2TiV(PO4)3 with three-electron redox and high performance for future practical SIBs applications.
Research Area(s)
- Air-stable, All-climate, Na2TiV(PO4)3, NASICON, Sodium-ion batteries
Citation Format(s)
All-climate and air-stable NASICON-Na2TiV(PO4)3 cathode with three-electron reaction toward high-performance sodium-ion batteries. / Zhang, Wei; Xu, Zhenming; Li, Huangxu et al.
In: Chemical Engineering Journal, Vol. 433, No. Part 2, 133542, 01.04.2022.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review