Reversible magnesium and aluminium ions insertion in cation-deficient anatase TiO2

Toshinari Koketsu, Jiwei Ma, Benjamin Morgan, Monique Body, Christophe Legein, Walid Dachraoui, Matthia Giannini, Arnaud Demortiere, Mathieu Salanne, François Dardoize, Henri Groult, Olaf Borkiewicz, Karena Chapman, Peter Strasser, Damien Dambournet

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In contrast to monovalent lithium or sodium ions, the reversible insertion of multivalent ions such as Mg2+ and Al3+ into electrode materials remains an elusive goal. Here, we demonstrate a new strategy to achieve reversible Mg2+ and Al3+ insertion in anatase TiO2, achieved through aliovalent doping, to introduce a large number of titanium vacancies that act as intercalation sites. We present a broad range of experimental and theoretical characterizations that show a preferential insertion of multivalent ions into titanium vacancies, allowing a much greater capacity to be obtained compared to pure TiO2. This result provides a new strategy for the chemical design of materials for practical multivalent batteries.
Original languageEnglish
Pages (from-to)1142-1148
Number of pages7
JournalNature Materials
Early online date18 Sept 2017
Publication statusPublished - 1 Nov 2017


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