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Enhanced sodium ion storage in Prussian blue cathode material through nickel doping

Abstract

Prussian blue (PB) is an promising and cost-effective materials for sodium ion batteries (SIBs) because it possesses fast diffusion channels for Na ion migration and features a two-electron redox reaction mechanism that offers a high theoretical capacity of 170 mAh/g. However, it is difficult to attain the full discharge capacity of PB in SIBs by the low-spin Fe2+/Fe3+ redox couple. In the present study, we found that doping PB with Ni ions (1-10%) resulted in enhanced electrochemical storage capacity and facilitated fast Na ion diffusion during discharge. Specifically, PB doped with 3% Ni ions showed a discharge capacity of 117 mAh/g, within which approximately 50 mAh/g was attributed to the low-spin Fe2+C6/Fe3+C6 redox couples. Despite that a gap remains to attain the full storage capacity of PB, this research sheds light on how substituting transition metal ions affects its electrochemical performance.

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Publication details

The article was received on 05 Jan 2017, accepted on 18 Apr 2017 and first published on 18 Apr 2017


Article type: Paper
DOI: 10.1039/C7TA00132K
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Enhanced sodium ion storage in Prussian blue cathode material through nickel doping

    H. Fu, C. Liu, C. Zhang, W. Ma, K. Wang, Z. Li, X. Lu and G. Cao, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA00132K

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