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Fabrication of Li4Ti5O12 Spinel Thin Films for Li Mirobattery Applications
Wednesday, 8 October 2014
Expo Center, 1st Floor, Center and Right Foyers (Moon Palace Resort)
K. Z. Fung (Research Center for Energy Technology and Strategy, National Cheng Kung University, Research Center for Energy Technology and Strategy, Dept. of Materials Science and Engineering, National Cheng Kung University, Taiwan), S. Y. Tsai (Dept. of Materials Science and Engineering, National Cheng Kung University, Taiwan), C. T. Ni (Dept. of Materials Science and Engineering, National Cheng Kung University), A. F. Orliukas (Faculty of Physics, Vilnius University, Lithuania), G. Bajars (Institute of Solid State Physics, University of Latvia, Riga), and M. H. Chen (Dept. of Materials Science and Engineering, National Cheng Kung University, Taiwan)
Lithium titanium oxide spinel Li
4Ti
5O
12 has been reported to be a zero-strain lithium insertion host material because it exhibits extremely small variations of the lattice parameters during the charge and discharge processes. In general, Poor adhesion between thin-film electrode and substrates is the common cause for performance degradation of thin-film electrode during repeated charge/discharge tests. Thus, Li4Ti5O12 spinel may be the ideal candidate for the anode of thin-film Li ion battery for long cycle applications.
However, different electrochemical behaviors will be expected when Li4Ti5O12 spinel is prepared in thin-film compared to that in power forms. Therefore, the objective of this work is (1) to fabricate thin film of Li4Ti5O12 spinel by using RF-sputtering technique, (2) to investigate the effect of annealing temperature/atmospheres on the electrical/electrochemical properties of thin film Li4Ti5O12, (3) to evaluate the feasibility of using thin film of Li4Ti5O12 as anode for Li microbattery applications.
In this study, the Li4Ti5O12 thin film was deposited on either the Si substrate or glass substrate by sputtering technique. The crystallization of deposited Li4Ti5O12 thin film will be enhanced by annealing at various atmospheres and temperatures. The single phase Li4Ti5O12 was finally obtained after co-sputtering of Li-containg and Ti-containing targets. The crystal structure and crystallization will be examined by glancing XRD. The resistivity of Li4Ti5O12 thin film will be evaluated by four probe technique and our novel micromeaurement system. The capacity of Li4Ti5O12 thin film will be evaluated from charge/discharge tests.
