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Issue 12, 2019
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Structural impact of Zn-insertion into monoclinic V2(PO4)3: implications for Zn-ion batteries

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Abstract

The zinc-ion battery (ZIB) has been a system of particular interest in the research community as a possible alternative to lithium-ion batteries (LIB), and much work has been devoted to finding a suitable host material. In this article, monoclinic V2(PO4)3 is investigated as a host material for reversible insertion of Zn2+. Initial chemical assessment via a facile microwave-assisted chemical insertion method indicates the possibility of Zn2+ insertion into the host. Electrochemical assessment, however, exhibits a significant capacity fade. In-depth analysis on the average and local structure of Li3V2(PO4)3, the empty host V2(PO4)3, and the Zn-inserted V2(PO4)3 reveals that heavy distortion is induced upon Zn2+ insertion into the V2(PO4)3 framework, which is believed to be a result of a strong host–guest interaction jeopardizing the structural integrity. This is further supported by the dissolution of most of the material during the chemical oxidation of the Zn-inserted V2(PO4)3. The underlying structural inadequacy poses difficulties for monoclinic V2(PO4)3 to be a viable reversible host for Zn-ion batteries. This work suggests that not only the electrostatic repulsions of multivalent ions in a structure during diffusion, but also the structural stability of the host upon insertion of multivalent ions, must be considered for a better design of suitable host materials for multivalent-ion batteries.

Graphical abstract: Structural impact of Zn-insertion into monoclinic V2(PO4)3: implications for Zn-ion batteries

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Publication details

The article was received on 20 Jan 2019, accepted on 22 Feb 2019 and first published on 22 Feb 2019


Article type: Paper
DOI: 10.1039/C9TA00716D
J. Mater. Chem. A, 2019,7, 7159-7167

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    Structural impact of Zn-insertion into monoclinic V2(PO4)3: implications for Zn-ion batteries

    M. J. Park, H. Yaghoobnejad Asl, S. Therese and A. Manthiram, J. Mater. Chem. A, 2019, 7, 7159
    DOI: 10.1039/C9TA00716D

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