Details

Autor(en) / Beteiligte

• Koketsu, Toshinari
• Ma, Jiwei
• Morgan, Benjamin J.
• Body, Monique
• Legein, Christophe
• Dachraoui, Walid
• Giannini, Mattia
• Demortière, Arnaud
• Salanne, Mathieu
• Dardoize, François
• Groult, Henri
• Borkiewicz, Olaf J.
• Chapman, Karena W.
• Strasser, Peter
• Dambournet, Damien

Titel

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

Ist Teil von

• Nature materials, 2017-11, Vol.16 (11), p.1142-1148

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 highlights the possibility to use the chemistry of defects to unlock the electrochemical activity of known materials, providing a new strategy for the chemical design of materials for practical multivalent batteries.