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

【Author】

WANG Jing;CHEN Zhi-Ning;GUO Yu-Zhong;HUANG Rui-An;WANG Jian-Hua

【Institution】

Faculty of Materials Science and Engineering, Kunming University of Science and Technology;Faculty of Materials Science and Engineering, Kunming University of Science and Technology;Faculty of Materials Science and Engineering, Kunming University of Science and Technology;National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology;Faculty of Materials Science and Engineering, Kunming University of Science and Technology

【Abstract】

Using SBA-15 of SiO 2 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. The MRR process of the SBA-15 was investigated in depth, and 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 Mg 2Si intermediate phase in MRR process, based 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 °C) upon reaction, and in liquid–solid reaction pattern react with SiO 2 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.

【Keywords】

Li-ion battery;ordered mesoporous Si architecture;magnesiothermic reduction reaction;intermediate phase of Mg- 2Si;micro-fluid field assembly

References

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Total: 33 articles

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