Rational design of void-involved Si@TiO2 nanospheres as high-performance anode material for lithium-ion batteries

Shan Fang, Laifa Shen, Guiyin Xu, Ping Nie, Jie Wang, Hui Dou, Xiaogang Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

95 Citations (Scopus)

Abstract

A unique core-shell structure of silicon@titania (Si@TiO2) composite with silicon nanoparticles encapsulated in TiO2 hollow spheres is synthesized by a simple hydrolysis method combined with magnesiothermic reduction method. It is found that the TiO2 shell is effective for improving the electrical conductivity and structural stability. More importantly, the well-designed nanostructure with enough empty space would accommodate the volume change of silicon during the cycling. Reversible capacities of 1911.1 and 795 mAh g-1 can be obtained at 0.05 C and a high current rate of 1 C, respectively. After 100 cycles at 0.1 C, the composite electrode still maintains a high capacity of 804 mAh g-1. This excellent cycling stability and high-rate capability can be ascribed to the unique core-shell nanostructure and the synergistic effect between Si and TiO2.

Original languageEnglish
Pages (from-to)6497-6503
Number of pages7
JournalACS Applied Materials and Interfaces
Volume6
Issue number9
DOIs
Publication statusPublished - 2014 May 14
Externally publishedYes

Keywords

  • anode
  • core-shell structure
  • Li-ion batteries
  • silicon
  • titanium dioxide

ASJC Scopus subject areas

  • Materials Science(all)

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