Electrochemical properties of Si/LiTi2O4 nanocomposite as anode materials for Li-ion secondary batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)7-13
Journal / PublicationJournal of Electroanalytical Chemistry
Volume616
Issue number1-2
Online published11 Jan 2008
Publication statusPublished - 1 May 2008
Externally publishedYes

Abstract

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 cm2 s−1 based on the semi-infinite diffusion model.

Research Area(s)

  • Si/LiTi2O4, Nanocomposite film, Sol–gel, Anode, Li ion batteries