Issue 91, 2019
From the journal:

Chemical Communications

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

Kosuke Kawai, ORCID logo a   Daisuke Asakura, ORCID logo b   Shin-ichi Nishimura ORCID logo ac  and  Atsuo Yamada ORCID logo *ac  

* Corresponding authors

a Department of Chemical System Engineering, School of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan
E-mail: yamada@chemsys.t.-tokyo.ac.jp

b Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8564, Japan

c Elemental Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan

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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Article information

DOI
https://doi.org/10.1039/C9CC04860J
Article type
Communication
Submitted
25 Jun 2019
Accepted
10 Sep 2019
First published
11 Sep 2019

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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