Hierarchically structured lithium titanate for ultrafast charging in long-life high capacity batteries

Mateusz Odziomek, Frédéric Chaput (), Anna Rutkowska, Konrad Świerczek, Danuta Olszewska, Maciej Sitarz, Frédéric Lerouge and Stephane Parola
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Mateusz Odziomek: Université de Lyon, Ecole Normale Supérieure de Lyon, CNRS UMR 5182, Université Lyon 1, Laboratoire de Chimie
Frédéric Chaput: Université de Lyon, Ecole Normale Supérieure de Lyon, CNRS UMR 5182, Université Lyon 1, Laboratoire de Chimie
Anna Rutkowska: Faculty of Energy and Fuels, AGH University of Science and Technology
Konrad Świerczek: Faculty of Energy and Fuels, AGH University of Science and Technology
Danuta Olszewska: Faculty of Energy and Fuels, AGH University of Science and Technology
Maciej Sitarz: Faculty of Materials Science and Ceramics, AGH University of Science and Technology
Frédéric Lerouge: Université de Lyon, Ecole Normale Supérieure de Lyon, CNRS UMR 5182, Université Lyon 1, Laboratoire de Chimie
Stephane Parola: Université de Lyon, Ecole Normale Supérieure de Lyon, CNRS UMR 5182, Université Lyon 1, Laboratoire de Chimie

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract High-performance Li-ion batteries require materials with well-designed and controlled structures on nanometre and micrometre scales. Electrochemical properties can be enhanced by reducing crystallite size and by manipulating structure and morphology. Here we show a method for preparing hierarchically structured Li4Ti5O12 yielding nano- and microstructure well-suited for use in lithium-ion batteries. Scalable glycothermal synthesis yields well-crystallized primary 4–8 nm nanoparticles, assembled into porous secondary particles. X-ray photoelectron spectroscopy reveals presence of Ti+4 only; combined with chemical analysis showing lithium deficiency, this suggests oxygen non-stoichiometry. Electron microscopy confirms hierarchical morphology of the obtained material. Extended cycling tests in half cells demonstrates capacity of 170 mAh g−1 and no sign of capacity fading after 1,000 cycles at 50C rate (charging completed in 72 s). The particular combination of nanostructure, microstructure and non-stoichiometry for the prepared lithium titanate is believed to underlie the observed electrochemical performance of material.

Date: 2017
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DOI: 10.1038/ncomms15636

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