Journal of Inorganic Materials ›› 2018, Vol. 33 ›› Issue (3): 313-319.doi: 10.15541/jim20170145

• Orginal Article • Previous Articles     Next Articles

Preparation and Electrochemical Performance of Ordered Mesoporous Si/C Composite for Anode Material

Jing WANG1(), Zhi-Ning CHENG1, Yu-Zhong GUO1(), Rui-An HUANG2(), Jian-Hua WANG1   

  1. 1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
    2. National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China;
  • Received:2017-03-30 Revised:2017-06-14 Online:2018-03-20 Published:2018-03-12
  • About author:WANG Jing. E-mail: 1456429099@qq.com
  • Supported by:
    National Natural Science Foundation of China (51464025)

Abstract:

Using SBA-15 of SiO2 template as precursor, a bundle-shaped ordered mesoporous nanoarchitecture Si/C composite (OMP-Si/C) was successfully assembled 2D-directionally by a magnesiothermic reduction reaction (MRR) route and the ensuing carbon-coating modification processing, and the MRR process of the SBA-15 was investigated in depth, the electrochemical performance of as-prepared OMP-Si/C composites was tested. Analysis based on XRD data reveals the presence of a reaction path of Mg2Si intermediate phase in MRR process, on which a T-t (reaction temperature-reaction time) phase transition diagram is proposed. DSC/TG analysis shows that Mg particles may melt below its melting point (648℃) upon reaction, and in liquid-solid reaction pattern react with SiO2 via melting-reaction teamwork. Observed from FE-SEM, SBA-15 column units are validated to assemble into a lotus-root-chain-bundle shaped nanoarchitecture of ordered mesoporous silicon, which can effectively offset the drastic volume change of Si material inherent in the charge/discharge process, and exhibit excellent cycling stability and rate capability. Based on the micro-fluid field assembling mechanism, the two-dimensional directional assembly process can be reasonably interpreted.

Key words: Li-ion battery, ordered mesoporous Si architecture, magnesiothermic reduction reaction, intermediate phase of Mg2Si, micro fluid field assembly

CLC Number: 

  • O646