Revealing the Fast and Durable Na+Insertion Reactions in a Layered Na3Fe3(PO4)4Anode for Aqueous Na-Ion Batteries

Shen Qiu, Marcos Lucero, Xianyong Wu, Qi Wang, Maoyu Wang, Yan Wang, Widitha S. Samarakoon, Meilani R. Bolding, Zhenzhen Yang, Yaqin Huang, Zhichuan J. Xu, Meng Gu, Zhenxing Feng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Aqueous sodium-ion batteries represent a promising approach for stationary energy storage; however, the lack of appropriate anode materials has substantially retarded their development. Herein, we demonstrated an iron-based phosphate material of Na3Fe3(PO4)4 as an inexpensive and efficacious anode alternative. While the Fe3+/Fe2+ redox couple renders a two-Na-insertion reaction with desirable potentials, its unique layered structure further facilitates the Na-insertion kinetics and reversibility. Consequently, this electrode exhibits an appealing Na-insertion performance, with a reversible capacity of ∼83 mAh g-1, suitable anode potential of -0.4 V vs Ag/AgCl, excellent rate capability of 200 C, and outstanding cycling of 6000 cycles. Utilizing operando synchrotron X-ray diffraction and X-ray absorption spectroscopy, we revealed the structural evolution of the Na3Fe3(PO4)4 anode during the two-electron reaction, where the extremely small volume expansion (∼3%) enables its fast-charging and long-cycling capability. Our work suggests new considerations of developing versatile iron phosphate compounds as appealing anode materials for energy storage in aqueous electrolytes.

Original languageEnglish
Pages (from-to)63-71
Number of pages9
JournalACS Materials Au
Volume2
Issue number1
DOIs
Publication statusPublished - Jan 12 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society.

ASJC Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Polymers and Plastics
  • Materials Chemistry

Keywords

  • anode
  • aqueous sodium ion batteries
  • fast charging
  • layered structure
  • sodium iron phosphate

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