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

doi:10.15541/jim20170145

Abstract

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

WANG Jing, CHENG Zhi-Ning, GUO Yu-Zhong, HUANG Rui-An, WANG Jian-Hua. Preparation and Electrochemical Performance of Ordered Mesoporous Si/C Composite for Anode Material[J]. Journal of Inorganic Materials, 2018, 33(3): 313-319.

Figures/Tables 8

Fig. 1 XRD patterns of the samples prepared by magnesiothermic reduction routes(a) Reaction at 400, 500, 600 and 660℃for 5 h, OMP-Si and OMP-Si/C; (b) Reaction at 560℃for 5, 10, 15 and 20 h

Fig. 2 Temperature-time graph reaction transformation of SBA-15 via magnesiothermic reduction routes (T-t graph)

Fig. 3 FESEM images of porous Si synthesized under different conditions(a, b) SBA-15; (c, d) Without acid etching, 400℃, 20 h; (e, f) Without acid etching, 500℃, 20 h; (g, h) Without acid etching, 600℃, 5 h; (i, j) Without acid etching, 660℃, 5 h; (k, l) Hydrochloric acid treatment OMP-Si, 660℃, 5 h

Fig. 4 DSC/TG analyzing curves of SBA-15/Mg powdery admixture sample with weight ratio of 1∶1 at temperature rise rate of 10℃/min

Fig. 5 Schematic illustration of the mechanism of SBA-15 magnesiothermic reduction

Fig. 6 N2 adsorption and desorption isotherms with inset showing the pore size distribution curve for synthesized samples

Fig. 7 (a) Charge/discharge curves of OMP-Si/C sample and (b) the specific capacity and columbic efficiency versus cycle number for as-prepared samples

Fig. 8 Rate performance of (a) OMP-Si and (b) OMP-Si/C

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