Synthesis of nano-Li4Ti5O12 decorated by silver nanoparticles as an anode material for lithium ion batteries

Monika Michalska 1Michał Krajewski 2Dominika Ziółkowska 3Bartosz Hamankiewicz 2Jacek Jasiński 4Ludwika Lipińska 1Andrzej Czerwiński 2

1. Institute of Electronic Materials Technology (ITME), Wólczyńska, Warsaw 01-919, Poland
2. Warsaw University, Faculty of Chemistry, Pasteura 1, Warszawa 02-093, Poland
3. Warsaw University, Institute of Experimental Physics (IEP UW), Hoża 69, Warszawa 00-681, Poland
4. Conn Center for Renewable Energy Research, University of Louisville, Louisville KY 40292, United States

Abstract

Lithium-titanium oxide Li4Ti5O12 of spinel structure is one of the promising negative electrode (anode) material to replace a costly and unsafe graphite. Li4Ti5O12 (LTO) is cheaper and more safe compared to graphite, due to high potential of 1.55 V versus Li/Li+ which prevent metallic lithium plating on negative electrode during overcharge. Owing to no structural change during lithiation and delithiation processes („zero-strain” electrode) the material shows excellent cyclability. However, Li4Ti5O12 suffers from lower theoretical specific capacity compared to graphite, which is 175 mAh/g and its insulating character, which prevents using it in high current applications. The conductivity of LTO spinel can be greatly improved by various surface modifications, cation doping or preparing this material in the nanocrystalline form.

In this context, we have prepared nanocrystalline lithium-titanium oxide (Li4Ti5O12) and modified its surface using silver metalic nanoparticles. Also our studies demonstrate, that highly dispersed Ag nanoparticles on the surface of Li4Ti5O12 grains, greatly improve their high-rate capability and cyclability.

All the obtained powders have been characterized by a numbers of methods: X-ray powder diffraction (XRD), Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM). Also the electrochemical tests were performed.

References: 

M. Krajewski, M. Michalska, B. Hamankiewicz, D. Ziolkowska, K. P. Korona, J. B. Jasinski, M. Kaminska, L. Lipinska, A. Czerwinski: Li4Ti5O12 modified with Ag nanoparticles as an advanced anode material in lithium-ion batteries, Journal of Power Sources 245, (2014), 764-771.

Acknowledgments:

This work was supported by The National Science Centre through the research grant DEC-2011/03/N/ST5/04389. M. Michalska would like to thank for the scholarship awarded by the Mazovia Voivodeship Office through the Scientific Potential for the Economy of Mazovia PhD Program, co-funded by the European Social Fund.

 

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Presentation: Poster at Nano and Advanced Materials Workshop and Fair, by Monika Michalska
See On-line Journal of Nano and Advanced Materials Workshop and Fair

Submitted: 2013-07-14 15:01
Revised:   2013-08-17 11:12