4.8 Article

Lithium diffusion in sputter-deposited Li4Ti5O12 thin films

Journal

JOURNAL OF POWER SOURCES
Volume 215, Issue -, Pages 109-115

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2012.04.102

Keywords

Ion beam sputtering; Lithium ion batteries; Lithium titanium oxide; Chemical diffusion coefficient; GITT

Funding

  1. German Federal Ministry of Education and Research (BMBF)

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Li4Ti5O12 (LTO) thin films are deposited by dc-ion beam sputtering at different oxygen partial pressures and different substrate temperatures. In order to investigate, how these two parameters influence the atomic structure, the specimens are characterized by X-ray diffraction and transmission electron microscopy. Electrochemical characterization of the films is done by cyclic voltammetry and chronopotentiometry. To determine an averaged chemical diffusion coefficient of lithium, a method is developed, evaluating c-rate tests. The results obtained by this method are compared to results obtained by the well established galvanostatic intermittent titration technique (GITT), which is used to determine a concentration dependent diffusion coefficient of lithium in LTO. (C) 2012 Elsevier B.V. All rights reserved.

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