Highly crystalline sodium manganese ferrocyanide microcubes for advanced sodium ion battery cathodes

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

21 Scopus Citations
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Author(s)

  • Fangwei Peng
  • Lei Yu
  • Pengyue Gao
  • Xiao-Zhen Liao
  • Jianguo Wen
  • Yu-Shi He
  • Guoqiang Tan
  • Zi-Feng Ma

Detail(s)

Original languageEnglish
Pages (from-to)22248-22256
Journal / PublicationJournal of Materials Chemistry A
Volume7
Issue number39
Online published19 Sep 2019
Publication statusPublished - 21 Oct 2019
Externally publishedYes

Abstract

The microstructure and morphology of the crystal play an important role in the physical and electrochemical properties of electrode materials. Here we report a highly crystalline microcube structure of Na-rich Prussian white Na1.92Mn[Fe(CN)6]0.98 for sodium ion battery cathodes. The obtained structure features high crystallinity of the monoclinic structure with an average cubic size of 3-5 μm. Because of the improvement on microstructural and electrical properties, the cathode design enables promising electrochemical performance. The electrode exhibits an outstanding rate performance with reversible capacities of 152.8 mA h g-1 (10 mA g-1), 128.1 mA h g-1 (100 mA g-1), 118.7 mA h g-1 (500 mA g-1) and 110.3 mA h g-1 (1000 mA g-1). It also exhibits a good cycling performance with a capacity retention of 82% after 500 cycles at 100 mA g-1. More importantly, the XRD analysis reveals a highly reversible monoclinic-cubic-monoclinic structural evolution of the cathode upon Na+ extraction/insertion. The good rate and cycling performance can be attributed to the robust crystal structure with few defects and fast Na+ transfer kinetics. The high purity single crystal morphology can also reduce the side reactions on the electrode/electrolyte interface.

Citation Format(s)

Highly crystalline sodium manganese ferrocyanide microcubes for advanced sodium ion battery cathodes. / Peng, Fangwei; Yu, Lei; Gao, Pengyue; Liao, Xiao-Zhen; Wen, Jianguo; He, Yu-Shi; Tan, Guoqiang; Ren, Yang; Ma, Zi-Feng.

In: Journal of Materials Chemistry A, Vol. 7, No. 39, 21.10.2019, p. 22248-22256.

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