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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/25945

Title: Low-temperature synthesized Li4Ti5O12 powder for lithium ion battery anodes via combustion synthesis
Authors: De Sloovere, Dries
Ulu Okudur, Fulya
Vranken, Thomas
Van Bael, Marlies K.
Hardy, An
Issue Date: 2017
Citation: II INTERNATIONAL CONFERENCE OF YOUNG SCIENTISTS ON TOPICAL PROBLEMS OF MODERN ELECTROCHEMISTRY AND ELECTROCHEMICAL MATERIALS SCIENCE, Serpukhov, Moscow Region, Russia, 17-20/09/2017
Abstract: As portable electronic consumer devices and electric vehicles become more widespread, there is an increasing requirement for electrochemical storage devices which are efficient and inexpensive. Since their commercialization by Sony in the 1990’s, lithium ion batteries have become the most common electrochemical storage device for portable electronics. Therefore, the development and improvement of lithium ion batteries is of major importance for our current day society. Due to its high stability (and therefore inherent safety), Li4Ti5O12 can be a valuable alternative for graphite as the anode material in lithium ion batteries. Unfortunately, the manufacturing of this material typically requires severe synthesis conditions, such as a high temperature (~800 °C) and a long reaction time (up to 24 hours). Thus, the eco-friendliness of batteries containing Li4Ti5O12 is limited by the synthesis conditions and could be improved by using a less energy-consuming synthesis method. The processing conditions for the synthesis of Li4Ti5O12 were reduced to 300 °C and seconds, respectively, by use of combustion synthesis. This synthesis method relies on the self-heating during decomposition of the precursor when a relatively low external temperature for the formation of oxides is applied. The synthesized samples could provide a capacity and stability comparable to high temperature synthesized Li4Ti5O12 (164 mAh g-1 at 0.1C). Increasing the current twentyfold resulted in a limited capacity decrease (Figure 1). This good rate capability could be explained by the morphology of the powder, since analysis with scanning electron microscopy (SEM) and transmission electron microscopy (TEM) proved that the sample consisted of agglomerated nanosized particles, which resulted in a rough surface morphology. X-ray diffraction (XRD) showed that the sample mainly consisted of Li4Ti5O12, although also a minor amount of impurities was present, of which the only electrochemically active phase was anatase TiO2. Its contribution to the total capacity of the sample was clear during the galvanostatic cycling of the sample at low C-rates. This work was published as “Combustion synthesis as a low temperature route to Li4Ti5O12 based powders for lithium ion battery anodes” (RSC Adv., 2017). DOI: 10.1039/C7RA02503C. This work was supported by the FWO, the Research Foundation Flanders [project G041913N]. This project received the support of the European Union, the European Regional Development Fund ERDF, Flanders Innovation & Entrepreneurship and the Province of Limburg.
URI: http://hdl.handle.net/1942/25945
Category: C2
Type: Conference Material
Appears in Collections: Research publications

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