All-iron sodium-ion full-cells assembled via stable porous goethite nanorods with low strain and fast kinetics

Yongxin Huang, Man Xie, Ziheng Wang, Ying Jiang, Qianming Huang, Xuedong Bai, Li Li, Feng Wu, Renjie Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Iron-based hydroxyl oxides can be regarded as feasible electrodes for sodium-ion batteries due to the simple preparation and rich resources. Goethite nanorod clusters that are wrapped by multi-walled carbon nanotubes with an open tunnel structure exhibit a considerable capacity, a favourable durability and an excellent rate capability within loose working conditions. The structural and electrochemical stability of this anode can be maintained when exposed at ambient environment after 30 days. Moreover, this anode coupled with high-quality Prussian blue cathode delivers feasible energy density of 60 W h kg −1 calculated on the basis of the pouch cell. Abundant voids formed by Kirkendall effect in nanorods allow for the simultaneous promotion of electrolyte infiltration, ion transfer and the pseudocapacitive effect. According to a series of ex situ and in situ measurements, the intercalation and conversion reactions for sodium storage have been revealed and low-volume deformation was observed during the sodiated/desodiated process. In particular, the existence of Na x FeOOH, Fe, NaOH and Na 2 O species at fully discharged state indicates an incomplete conversion reaction, resulting in steerable volume expansion and high ionic/electrical conductivity. The advanced sodium storage kinetics can be attributed to the moderate diffusion barrier and remarkable pseudocapacitive effect.

Original languageEnglish
Pages (from-to)294-304
Number of pages11
JournalNano Energy
Volume60
DOIs
Publication statusPublished - Jun 2019

Keywords

  • Anodes
  • FeOOH
  • Incomplete conversion reaction
  • Low-strain
  • Sodium-ion batteries

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Huang, Y., Xie, M., Wang, Z., Jiang, Y., Huang, Q., Bai, X., Li, L., Wu, F., & Chen, R. (2019). All-iron sodium-ion full-cells assembled via stable porous goethite nanorods with low strain and fast kinetics. Nano Energy, 60, 294-304. https://doi.org/10.1016/j.nanoen.2019.03.058