Journal
THIN SOLID FILMS
Volume 517, Issue 17, Pages 4767-4771Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2009.03.007
Keywords
Nanosized Si; Titanium carbide; Nanocomposite film; Lithium ion battery
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A Si/TiC nanocomposite film was synthesized by a surface sol-gel method in combination with a following heat-treatment process. The electrochemical properties of the film anode for lithium ion batteries were investigated by galvanostatic charge-discharge tests, cyclic voltammetry (CV) and electrochemical impedance spectrum (EIS). Because of the homogeneous distribution of Si active particles in TiC matrix, the Si/TiC composite showed reversible lithium storage capacities of about 1000 and 1300 mAh g(-1) at 160 and 80 mA g(-1) even after 80 cycles, respectively. Using two-parallel diffusion path model, the reactive mechanisms of Li with Si/TiC composite film were interpreted. The chemical diffusion coefficients of the Si/TiC nanocomposite film at different electrode potentials were also discussed. (C) 2009 Elsevier B.V. All rights reserved.
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