Controlled hydroxy-fluorination reaction of anatase to promote Mg2+ mobility in rechargeable magnesium batteries

Jiwei Ma; Toshinari Koketsu; Benjamin. J. Morgan; Christophe Legein; Monique Body; Peter Strasser; Damien Dambournet

doi:10.1039/C8CC04136A

Controlled hydroxy-fluorination reaction of anatase to promote Mg²⁺ mobility in rechargeable magnesium batteries†‡

Jiwei Ma,

§^ab Toshinari Koketsu,§^c Benjamin. J. Morgan,

^de Christophe Legein,

^f Monique Body,

^f Peter Strasser

^c and Damien Dambournet

*^ag

Author affiliations

* Corresponding authors

^a Sorbonne Université, CNRS, Physico-chimie des électrolytes et nano-systèmes interfaciaux, PHENIX, Paris F-75005, France
E-mail: damien.dambournet@sorbonne-universite.fr

^b Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China

^c The Electrochemical Energy, Catalysis, and Materials Science Laboratory, Department of Chemistry, Technical University Berlin, Berlin 10623, Germany

^d Department of Chemistry, University of Bath, Bath BA2 7AY, UK

^e The Faraday Institution, Quad One, Harwell Science and Innovation Campus, Didcot, UK

^f Institut des Molécules et Matériaux du Mans (IMMM) – UMR 6283 CNRS, Le Mans Université, Avenue Olivier Messiaen, Le Mans 72085, Cedex 9, France

^g Réseau sur le Stockage Electrochimique de l’Energie (RS2E), FR CNRS 3459, Amiens 80039, France

Abstract

In anatase TiO₂, substituting oxide anions with singly charged (F,OH) anions allows the controlled formation of cation vacancies, which act as reversible intercalation sites for Mg²⁺. We show that ion-transport (diffusion coefficients) and intercalation (reversible capacity) properties are controlled by two critical parameters: the vacancy concentration and the local anionic environment. Our results emphasise the complexity of this behaviour, and highlight the potential benefits of chemically controlling cationic-defects in electrode materials for rechargeable multivalent-ion batteries.

This article is part of the themed collection: Fluorine Chemistry

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Article information

DOI: https://doi.org/10.1039/C8CC04136A
Article type: Communication
Submitted: 24 Mai 2018
Accepted: 13 Aug 2018
First published: 13 Aug 2018

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Chem. Commun., 2018,54, 10080-10083

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Controlled hydroxy-fluorination reaction of anatase to promote Mg²⁺ mobility in rechargeable magnesium batteries

J. Ma, T. Koketsu, Benjamin. J. Morgan, C. Legein, M. Body, P. Strasser and D. Dambournet, Chem. Commun., 2018, 54, 10080 DOI: 10.1039/C8CC04136A

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