期刊论文

Xia, Mao;Zhou, Zhi

英文

Applied Surface Science

0169-4332

2020

500

144026

10.1016/j.apsusc.2019.144026

The structure and composition of the materials are measured by XRD and Raman spectrometer (see Fig. 2). The XRD pattern of Si@TiO2-B/CNTs is exhibited in the Fig. 2a. And the illustration is the XRD patterns of Si, Si/CNTs and Si@TiO2-B/CNTs samples. Obviously, all samples show the major identified peaks at 2 thetas = 28.3°, 47.3°, 56.0°, 69.1° and 76.3°. It proves that the crystal of nano Si (JCPDS no. 27-1402) have not been destroyed after hydrothermal and thermal treatment process [33].

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As an anode with ultrahigh capacity (4200 mAh g−1), silicon (Si) has inherent defects, such as drastic volume change (~300%) and poor conductivity. To cope with these problems, constructing a rigid shell (e.g. TiO2) on the surface of Si particles is an effective method. Typically, monoclinic titanium dioxide (TiO2-B) has the more excellent electrochemical performance among the various crystalline of TiO2 (anatase, rutile, etc.) for its open channel and characteristic pseudocapacitive effect. In addition, carbon nanotubes (CNTs) are good conduc...