期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 9, 页码 6497-6503出版社
AMER CHEMICAL SOC
DOI: 10.1021/am500066j
关键词
silicon; titanium dioxide; core-shell structure; Li-ion batteries; anode
资金
- National Basic Research Program of China (973 Program) [2014CB239701]
- National Natural Science Foundation of China [21103091, 21173120, 51372116]
- Natural Science Foundation of Jiangsu Province [BK2011030]
- Fundamental Research Funds for the Central Universities [NP2014403]
- Fundation of Graduate Innovation Center in NUAA [kfjj130124]
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) 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.
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