Water-mediated cation intercalation of open-framework indium hexacyanoferrate with high voltage and fast kinetics

Liang Chen (), Hezhu Shao, Xufeng Zhou, Guoqiang Liu, Jun Jiang and Zhaoping Liu ()
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Liang Chen: Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences
Hezhu Shao: Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences
Xufeng Zhou: Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences
Guoqiang Liu: Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences
Jun Jiang: Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences
Zhaoping Liu: Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences

Nature Communications, 2016, vol. 7, issue 1, 1-10

Abstract: Abstract Rechargeable aqueous metal-ion batteries made from non-flammable and low-cost materials offer promising opportunities in large-scale utility grid applications, yet low voltage and energy output, as well as limited cycle life remain critical drawbacks in their electrochemical operation. Here we develop a series of high-voltage aqueous metal-ion batteries based on ‘M+/N+-dual shuttles’ to overcome these drawbacks. They utilize open-framework indium hexacyanoferrates as cathode materials, and TiP2O7 and NaTi2(PO4)3 as anode materials, respectively. All of them possess strong rate capability as ultra-capacitors. Through multiple characterization techniques combined with ab initio calculations, water-mediated cation intercalation of indium hexacyanoferrate is unveiled. Water is supposed to be co-inserted with Li+ or Na+, which evidently raises the intercalation voltage and reduces diffusion kinetics. As for K+, water is not involved in the intercalation because of the channel space limitation.

Date: 2016
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DOI: 10.1038/ncomms11982

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