4.6 Article

Li-ion diffusion in amorphous Si films prepared by RF magnetron sputtering: A comparison of using liquid and polymer electrolytes

Journal

MATERIALS CHEMISTRY AND PHYSICS
Volume 120, Issue 2-3, Pages 421-425

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2009.11.031

Keywords

Amorphous Si film; Chemical diffusion coefficient; Potentiostatic intermittent titration technique; Electrochemical impedance spectroscopy

Funding

  1. Mie University
  2. Genesis Research Institute, Nagoya, Japan

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Amorphous Si films were prepared by radio frequency magnetron sputtering on Cu substrates and were characterized by X-ray diffraction and scanning electron microscopy. The potential dependence of Li-ion chemical diffusion coefficients, (D) over tilde (Li), in the films was determined by electrochemical impedance spectroscopy (EIS) and potentiostatic intermittent titration technique (PITT) using liquid and polymer electrolytes. The (D) over tilde (Li) values obtained using the polymer electrolyte were lower than those using the liquid electrolyte. It was found. that the (D) over tilde (Li) values of the Si film measured by PITT and EIS using the polymer electrolyte were in the range of 4 x 10(-13)-2 x 10(-13) cm(2) s(-1) and 4 x 10(-13)-10(-14) cm(2) s-i respectively, at 50 degrees C. (C) 2009 Elsevier B.V. All rights reserved.

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