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Transport of External Lithium Along Phase Boundary in LiF-Ti Nanocomposite Thin Films

Hong Li, Hao Zheng, Jieyun Zheng, Jian Gao, Rui Wang

Abstract


The electronic and ionic conductivity of the LiF-Ti nanocomposite films prepared by the co-sputtering have been investigated by the methods of impedance spectrum (IS), current-voltage curves (IV) and isothermal transient ionic current (ITIC) measurements. It is found that the ionic conductivity of the LiF-Ti nanocomposite film is very low. After electrochemical and chemical lithiation, ionic conductivities of the lithiated LiF-Ti composite films are increased to be 10-3 and 10-4 S/cm separately. This phenomenon indicates that the phase boundary between LiF and Ti should be the ionic conducting channels for external lithium in the LiF-Ti nanocomposite. Our results suggest a new strategy to design ionic or mixed ionic conductor.


Keywords


LiF-Ti nanocomposite; thin film; lithiation; external lithium; ionic conductivity; phase boundary

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DOI: http://dx.doi.org/10.17344/acsi.2016.2346

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Copyright (c) 2016 Hong Li, Hao Zheng, Jieyun Zheng, Jian Gao, Rui Wang

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