High-Performance NaVOwith Mixed Cationic and Anionic Redox Reactions for Na-Ion Battery Applications

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

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Author(s)

  • Shuilin Wu
  • Hanqin Liang
  • Junnan Liu
  • Damian Goonetilleke
  • Neeraj Sharma

Detail(s)

Original languageEnglish
Pages (from-to)8836–8844
Journal / PublicationChemistry of Materials
Volume32
Issue number20
Online published15 Oct 2020
Publication statusPublished - 27 Oct 2020

Abstract

Sodium-ion batteries (NIBs) are a potential low-cost alternative to lithium-ion batteries for large-scale energy storage, but many high-capacity NIB cathode materials undergo irreversible structural changes during charge and discharge, leading to fast capacity fading. Herein, monoclinic NaVOexhibits good cycle performance with high capacity as a cathode material for NIBs. In situ synchrotron X-ray diffraction studies show that the material structure is virtually invariant during Na+ (de- )intercalation, with the a and b lattice parameters changing only by 0.13 and 0.19%, respectively. The material undergoes an oxygen redox reaction during initial charge while delivering a remarkable specific capacity of 245 mAh g-1 (1.2-4.7 V) with contributions from cationic (V4+/V5+) and anionic (O2-/O-) redox couples during discharge. The stable VO4 tetrahedral framework also enables the material to give superior rate and cycle capabilities, with a capacity of 164 mAh g-1 (67% utilization) at a current of 1000 mA g-1 (about 5C) and a capacity retention of 90% after 50 cycles. Density functional theory calculations further verify the stability of the material and the charge-discharge mechanism. This work can broaden the horizon for designing high-energy cathode materials with enhanced structural stability for sodium-ion batteries.

Citation Format(s)

High-Performance NaVOwith Mixed Cationic and Anionic Redox Reactions for Na-Ion Battery Applications. / Su, Bizhe; Wu, Shuilin; Liang, Hanqin; Zhou, Wenchong; Liu, Junnan; Goonetilleke, Damian; Sharma, Neeraj; Sit, Patrick H.-L.; Zhang, Wenjun; Yu, Denis Y.W.

In: Chemistry of Materials, Vol. 32, No. 20, 27.10.2020, p. 8836–8844.

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