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

Abstract

Development of high-voltage cathode materials composed of abundant metals for rechargeable batteries is a crucial task to realize higher energy density in the large-scale electrical energy storages. Here we report a durable 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 Ti substitution to Cr. Charge/discharge mechanism of NCTP was studied by powder X-ray diffraction and soft X-ray absorption spectroscopy.

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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, Accepted Manuscript

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    Stabilization of 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, Accepted Manuscript , DOI: 10.1039/C9CC04860J

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