Insights into Reversible Sodium Intercalation in a Novel Sodium-Deficient NASICON-Type Structure:Na3.400.60Co0.5Fe0.5V(PO4)3

Jingrong Hou, Mohammed Hadouchi*, Lijun Sui, Jie Liu, Mingxue Tang, Zhiwei Hu, Hong Ji Lin, Chang Yang Kuo, Chien Te Chen, Chih Wen Pao, Yunhui Huang, Jiwei Ma*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The rational design of novel high-performance cathode materials for sodium-ion batteries is a challenge for the development of the renewable energy sector. Here, a new sodium-deficient NASICON phosphate, namely Na3.400.60Co0.5Fe0.5V(PO4)3, demonstrating the excellent electrochemical performance is reported. The presence of Co allows a third Na+ to participate in the reaction thus exhibiting a high reversible capacity of ≈155 mAh g−1 in the voltage range of 2.0–4.0 V versus Na+/Na with a reversible single-phase mechanism and a small volume shrinkage of ≈5.97% at 4.0 V. 23Na solid-state nuclear magnetic resonance (NMR) combined with ex situ X-ray diffraction (XRD) refinements provide evidence for a preferential Na+ insertion within the Na2 site. Furthermore, the enhanced sodium kinetics ascribed to Co-substitution is also confirmed in combination with electrochemical impedance spectroscopy (EIS), galvanostatic intermittent titration technique (GITT), and theoretical calculation.

Original languageEnglish
Article number2302726
JournalSmall
Volume19
Issue number46
DOIs
StatePublished - 15 Nov 2023

Keywords

  • NASICON-type structures
  • operando X-ray diffraction
  • single-phase reaction mechanism
  • sodium intercalation
  • sodium-deficient

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