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Controlled hydroxy-fluorination reaction of anatase to promote Mg²⁺ mobility in rechargeable magnesium batteries
- MaThese authors contributed equally to the work., Jiwei, Koketsu, Toshinari, Morgan, Benjamin. J., Legein, Christophe, Body, Monique, Strasser, Peter, Dambournet, Damien
- Chemical communications 2018 v.54 no.72 pp. 10080-10083
- anions, batteries, cations, chemical reactions, diffusivity, electrodes, magnesium, titanium dioxide
- 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.