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 journalpeer-review

View graph of relations

Author(s)

  • Wei Zhang
  • Zhenming Xu
  • Ming Xu
  • Sha Wang
  • Zheng Li
  • Aonan Wang
  • Liuyun Zhang
  • Liang He
  • Shihao Li
  • Bin Zhu
  • Zhian Zhang
  • Yanqing Lai

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number133542
Journal / PublicationChemical Engineering Journal
Online published13 Nov 2021
Publication statusOnline published - 13 Nov 2021

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; Xu, Ming; Wang, Sha; Li, Zheng; Wang, Aonan; Zhang, Liuyun; He, Liang; Li, Shihao; Zhu, Bin; Zhang, Zhian; Lai, Yanqing.

In: Chemical Engineering Journal, 13.11.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review