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

Special Issue: 离子电池材料

• Orginal Article • Previous Articles     Next Articles

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

WANG Jing1, CHENG Zhi-Ning1, GUO Yu-Zhong1, HUANG Rui-An2, WANG Jian-Hua1   

  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: