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

Authors

  • Hong Li Institute of Physics, Chinese Academy of Sciences
  • Hao Zheng Institute of Physics, CAS
  • Jieyun Zheng Institute of Physics, CAS
  • Jian Gao Institute of Physics, CAS
  • Rui Wang

DOI:

https://doi.org/10.17344/acsi.2016.2346

Keywords:

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

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.

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Published

18.04.2016

Issue

Vol. 63 No. 3 (2016)

Section

Physical chemistry

License

Except where otherwise noted, articles in this journal are published under the Creative Commons Attribution 4.0 International License