We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Electrochemical properties of core-shell nano-Si@carbon composites as superior anode materials for high-performance Li-ion batteries.
- Authors
Chen, Hedong; Hou, Xianhua; Qu, Lina; Ru, Qiang; Huang, Yuan; Hu, Shejun; Qin, Haiqing; Lam, Kwok-ho
- Abstract
Si@carbon composites have been successfully prepared via spray drying and subsequent calcination using PSA microspheres, nano-silicon and natural graphite as raw materials. Nano-silicon with a 20-100 nm particle size is prepared by radio-frequency electromagnetic induction. Such small nano-silicon particles can effectively accommodate the volume expansion of the Si@carbon anode. Additionally, the unique core-shell structure of Si@carbon composites can effectively alleviate the agglomeration of nano-silicon particles. Electrochemical tests show that the Si/carbon electrode delivers a high initial discharge capacity of approximately 1404.27 mAh g with an initial coulombic efficiency of 82.4 %. The discharge specific capacity remains as high as 73.6 % after 100 charging-discharging cycles, demonstrating the electrode material's good cycle stability. In addition, the corresponding specific capacity of the Si@carbon composites electrode remains at around 1150 mAh g at a current density of 1 A g. And when the current density is 0.1 A g, its specific capacity can still remain at around 920 mAh g, indicating excellent capacity reversibility. Therefore, Si@carbon composites are superior anode materials for high-performance Li-ion batteries.
- Subjects
ELECTROCHEMISTRY; CARBON composites; SILICON compounds; LITHIUM-ion batteries; MICROSPHERES
- Publication
Journal of Materials Science: Materials in Electronics, 2017, Vol 28, Issue 1, p250
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-016-5518-x