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

Author(s) Odziomek, M.; Chaput, F.; Rutkowska, A.; Świerczek, K.; Olszewska, D.; Sitarz, M.; Lerouge, F.; Parola, S.
Journal Nat Commun
Date Published 2017 May 26
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.

DOI 10.1038/ncomms15636
ISSN 2041-1723
Citation Odziomek M, Chaput F, Rutkowska A, Świerczek K, Olszewska D, Sitarz M, et al. Hierarchically structured lithium titanate for ultrafast charging in long-life high capacity batteries. Nat Commun. 2017;8:15636.

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