4.7 Article

Microspheres comprise Si nanoparticles modified with TiO2 and wrapped by graphene as high-performance anode for lithium-ion batteries

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

资金

  1. National Key R & D Program of China [2021YFB2400200]
  2. Natural Science Foundation of Shandong Province [ZR2020ME057, ZR202102190181]

向作者/读者索取更多资源

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).

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据