期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 616, 期 1-2, 页码 7-13出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2007.12.017
关键词
Si/LiTi2O4; nanocompositc film; sol-gel; anode; Li ion batteries
Si/LiTi2O4 nanocomposite film was synthesized by a sol-gel method in combination with a following heat-treatment process. Through this process, the nanosized Si particles were homogeneously distributed in the porous composite. The electrochemically less active LiTi2O4 working as a buffer matrix successfully prevented Si from cracking/crumbling during the charging/discharging process. The Si/LiTi2O4 nanocomposite exhibited a reversible lithium storage capacity of about 1100 mA h g(-1) with good cyclability, suggesting its promising nature in anode materials for Li ion batteries. A two-parallel diffusion path model fitted well with the impedance data of porous Si/LiTi2O4 composite at different potentials. The impedance in the low-frequency region was directly related to the diffusion of Li ions, and the Li ion diffusivity was on the order of 10(-13) cm(2) s(-1) based on the semi-infinite diffusion model. (c) 2008 Elsevier B.V. All rights reserved.
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