Pulse microwave deposition of cobalt oxide nanoparticles on graphene nanosheets as anode materials for lithium ion batteries

Chien Te Hsieh, Jiun Sheng Lin, Yu Fu Chen, Hsisheng Teng

研究成果: Article同行評審

6 引文 斯高帕斯(Scopus)

摘要

We report the high capacity, superior rate capability, and excellent cyclic stability of graphene nanosheets (GNs) decorated with Co 3O 4 nanoparticles as anodes in Li-ion batteries. A pulse microwave-assisted (MA) polyol method (total period: 30 min) is adopted to deposit cobalt oxides onto the GNs in water and ethylene glycol (EG), forming two types of Co 3O 4@GN hybrids. The selection of solvent in the MA process plays a central role in affecting the crystallinity, dispersion, and particle size of cobalt oxide particles. The resulting Co 3O 4@GN hybrid, prepared by the MA method in EG, shows a homogeneous dispersion of Co 3O 4 nanocrystals with an average size of 10 nm. The Co 3O 4@GN hybrid displays advantages of high reversible capacity, excellent cycleability, and high rate capability. This improved cyclic performance can be attributed to the formation of a three-dimensional GN framework decorated with Co 3O 4 nanocrystals, leading to fast diffusion of Li ions (diffusion coefficient: 5.82 × 10 -12 cm 2 s -1) and low internal resistance (equivalent series resistance: 92.2 Ω) determined by electrochemical impedance spectroscopy. With its ease of MA fabrication and good performance, the Co 3O 4@GN hybrid will hold promise in practical Li-ion batteries.

原文English
頁(從 - 到)15221-15228
頁數8
期刊Journal of Physical Chemistry C
116
發行號29
出版狀態Published - 2012 7月 26

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 能源(全部)
  • 物理與理論化學
  • 表面、塗料和薄膜

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