In-Depth Study of Li4 Ti5 O12 Performing Beyond Conventional Operating Conditions

ACS Applied Materials & Interfaces
Martin UhlemannDaria Mikhailova

Abstract

Lithium ion batteries (LIBs) are nowadays widely used in many energy storage devices, which have certain requirements on size, weight and performance. State-of-the-art LIBs operate very reliably and with good performance under restricted and controlled conditions, but lack in efficiency and safety when these conditions are exceeded. In this work, the influence of outranging conditions in terms of charging rate and operating temperature on electrochemical characteristics was studied on the example of lithium titanate (Li4Ti5O12, LTO) electrodes. Structural processes in the electrode, cycled with ultrafast charge and discharge, were evaluated by operando synchrotron powder diffraction and ex situ X-ray absorption spectroscopy. Based on the Rietveld refinement, it was shown, that the electrochemical storage mechanism is based on the Li-intercalation process at least up to current rates of 5C, meaning full battery charge within 12 min. For applications at temperatures between -30 and 60 °C, four carbonate-based electrolyte systems with different additives were tested for cycling performance in half-cells with LTO and metallic lithium as electrodes. It was shown, that the addition of 30 wt.% [PYR14][PF6] to the conventional LP30 ele...Continue Reading

References

Jul 25, 2009·Nature Materials·Michel ArmandBruno Scrosati
Nov 19, 2009·Journal of the American Chemical Society·W J H BorgholsF M Mulder
Nov 25, 2011·Chemistry : a European Journal·Vanchiappan AravindanHua-Kun Liu
Dec 5, 2012·Scientific Reports·Yan-Bing HeFeiyu Kang
Jun 16, 2015·ChemSusChem·Julian KalhoffStefano Passerini

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