期刊
APPLIED SURFACE SCIENCE
卷 598, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2022.153790
关键词
Silicon; Titanium dioxide; Spray drying; Bilayer modification; Lithium-ion battery
类别
资金
- National Key R & D Program of China [2021YFB2400200]
- Natural Science Foundation of Shandong Province [ZR2020ME057, ZR202102190181]
The newly designed Si@TiO2@rGO pomegranate-shaped microspheres exhibit high strength and superior reversible capacity, showing excellent cycling stability under high current density conditions.
Pomegranate shaped microspheres consisting of Si nanoparticles coated with a TiO2 shell and wrapped with reduced graphene oxide sheets (Si@TiO2@rGO) have been designed and fabricated. A sol-gel method is applied to coat the Si nanoparticles with a TiO2 shell. An electrostatic interaction assisted spray drying process combined with a calcination step have been explored to achieve the wrapping of graphene and the formation of the pomegranate shaped microspheres. The layer of anatase phase TiO2 shows a higher strength to withstand the structural deformation of Si. The new phase derived from the TiO2 layer after the lithium embedding can acted as high-speed diffusion channels for lithium ions. The formation of the porous microspheres provided adaptive space for volume expansion of Si, while the wrapping of the Si@TiO(2)nanoparticles with flexible graphene relieves the internal stress and further improves the conductivity of the Si electrode. The synergistic effects of the bilayer endow the Si@TiO2@rGO composite a superior reversible capacity of 1228.7 mAh g(-1) after 400 cycles at a current density of 0.5 A g(-1) and an excellent cycling stability of 776 mAh g(-1) after 1000 cycles at a high current density of 1 A g(-1).
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