Poster (Scientific congresses and symposiums)
TiO2 POROUS MESOCRYSTALS AND Li4Ti5O12 SPINEL AS NEGATIVE ELECTRODES FOR LITHIUM-ION BATTERIES
Amarilla, José Amarilla; Tartaj, Pedro; Mahmoud, Abdelfattah et al.
2013International Battery Association Meeting: IBA 2013
 

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Keywords :
Li-ion batteries; nanoprarticles; anode material; TiO2; Li4Ti5O12
Abstract :
[en] Lithium-ion batteries (LIBs) have been chosen for most of the automakers to power their hybrid and electrical vehicles (EVs). The long-size LIBs for EVs must to combine high energy and power with elevated safety and low cost. One of the most following ways to improve the safety is to substitute the carbonaceous compounds of the actual LIBs for active materials working at safe voltages (~1.5V). Among the anode materials under study, single and mixed titanium oxides are the one of the most promising [1]. In this work we report on the most relevant results of our researches on TiO2 porous mesocrystals and Li4Ti5O12 (LTO) spinel. Mesocrystals are colloidal crystals whose elemental units are nanocrystals that all grow oriented in the same crystallographic direction. They can have a behavior similar to single crystals while preserving nanoscale capabilities. By using an original methodology based on the thermally driven self-assembly of inverse nanomicelles we have been able to synthesize porous anatase mesocrystals [2]. Control of the synthesis conditions has allowed us to tailor both the primary (4-10 nm) and secondary (25-60 nm) particle sizes in these unique nanostructures. Among all the synthesized samples those with the smallest secondary sizes (25 nm) containing primary crystallite sizes of about 7 nm exhibit the better electrochemical performance. Particularly, they can deliver 260 mAh/g at 0.4C and 120 mAh/g at a the fast rate of 10C. These values are within the margin of the best reported for anatase based-anodes. The Li4Ti5O12 spinel, which is able to reversibly inserted/extracted Li+ at 1.5V without change of the cell volume (zero-strain electrode), is nowadays one of the most promising anode materials for safety LIBs. The main objective of our researches on LTO has been the systematic study of the influence of synthesis method on theirs electrochemical performances. To reach this goal LTO-samples were prepared by three different synthesis procedures (sol-gel, self-combustion and solid-state). The use of the same Ti-source (TiCl4) and strictly the same experimental conditions allowed performing a meaningful comparison analysis. Experimental results have permitted us to demonstrate the strong influence of the synthesis method on the capacity, cycleability and rate capability of the Li4Ti5O12 spinel in Li half-cell and Li-ion full-cell. Acknowledgements Financial support from the projects MAT2011-22969, MAT2011-25198, INNPACTO IPT-370000-2010-27 (MINECO) and MATERYENER P2009/PPQ-1626 (CAM) is acknowledged. References: [1] G-N Zhu, Y-G Wang, Y-Y Xia, Energy Environ. Sci., 5 (2012) 6652. [2] P. Tartaj, J.M. Amarilla, Advanced Materials. 23 (2011) 4904.
Disciplines :
Chemistry
Author, co-author :
Amarilla, José Amarilla
Tartaj, Pedro
Mahmoud, Abdelfattah  ;  Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Morales, Eduardo
Saadoune, Ismael
Language :
English
Title :
TiO2 POROUS MESOCRYSTALS AND Li4Ti5O12 SPINEL AS NEGATIVE ELECTRODES FOR LITHIUM-ION BATTERIES
Publication date :
11 March 2013
Event name :
International Battery Association Meeting: IBA 2013
Event place :
Barcalone, Spain
Event date :
du 11 au 15 Mars 2012
Audience :
International
Available on ORBi :
since 10 January 2018

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