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Issue 91, 2019
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Stabilization of a 4.5 V Cr4+/Cr3+ redox reaction in NASICON-type Na3Cr2(PO4)3 by Ti substitution

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Abstract

The development of high-voltage cathode materials composed of abundant metals for rechargeable batteries is a crucial task to realize higher energy density in large-scale electrical energy storage systems. Here we report a reversible Cr4+/Cr3+ redox reaction at 4.5 V vs. Na/Na+ in NASICON-type Na2CrTi(PO4)3 (NCTP). An unstable Cr4+/Cr3+ redox in Na3Cr2(PO4)3 is successfully stabilized by the substitution of Ti with Cr. The charge/discharge mechanism of NCTP was studied by powder X-ray diffraction and soft X-ray absorption spectroscopy.

Graphical abstract: Stabilization of a 4.5 V Cr4+/Cr3+ redox reaction in NASICON-type Na3Cr2(PO4)3 by Ti substitution

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Publication details

The article was received on 25 Jun 2019, accepted on 10 Sep 2019 and first published on 11 Sep 2019


Article type: Communication
DOI: 10.1039/C9CC04860J
Chem. Commun., 2019,55, 13717-13720

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    Stabilization of a 4.5 V Cr4+/Cr3+ redox reaction in NASICON-type Na3Cr2(PO4)3 by Ti substitution

    K. Kawai, D. Asakura, S. Nishimura and A. Yamada, Chem. Commun., 2019, 55, 13717
    DOI: 10.1039/C9CC04860J

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