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, DLi, in the films was determined by electrochemical impedance spectroscopy and potentiostatic intermittent titration technique using liquid and polymer electrolytes. The DLi values obtained using the polymer electrolyte were lower than those using the liquid electrolyte. It was found that the DLi values of the Si film measured by potentiostatic intermittent titration technique and electrochemical impedance spectroscopy using the polymer electrolyte were in the range of 4 x 10−13 to 2 x 10−13cm2/s and 4 x 10−13 to 10−14cm2/s, respectively, at 50C.

Li-Ion Diffusion in Amorphous Si Films Prepared by RF Magnetron Sputtering: a Comparison of using Liquid and Polymer Electrolytes. J.Xie, N.Imanishi, T.Zhang, A.Hirano, Y.Takeda, O.Yamamoto: Materials Chemistry and Physics, 2010, 120[2-3], 421-5