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Mesoporous Si/C composite anode material: experiments and first-principles calculations

  • Zhongliang Xiao
  • Ni Xia
  • Liubin SongEmail author
  • Zhong Cao
  • Huali Zhu
Original Paper
  • 68 Downloads

Abstract

Carbon-coated and doped mesoporous silicon/carbon (m-Si/C) composites were successfully prepared via carbon coating and molten magnesiothermic reduction by using mesoporous silica (SBA-15) and dopamine as raw materials. Experimental results were theoretically verified by first-principles calculation. The obtained m-Si/C composites exhibited a high initial Coulombic efficiency of 73% at 0.1 A g−1 and an excellent cycling stability with 617.5 mAh g−1 capacity after 100 cycles at 0.1 A g−1. This excellent performance was attributed to the combination of carbon and the mesoporous structure of SBA-15 to form a mesoporous carbon framework which could improve the stability and conductivity of the material. The oxygen defects that formed after molten magnesiothermic reduction could effectively alleviate the change in the volume of the Si core and shorten the diffusion path of Li+ in the Si core. Graphene layers could effectively reduce the energy of the system and the band gap, the embedding of Li+ would lead to the expansion and distortion of Si, and the carbon layer with elasticity and hardness could buffer the volume expansion of m-Si/C composites. Consistent with experimental results, theoretical results demonstrated that graphene-coated composites positively affected the Li storage of Si.

Keywords

Lithium-ion battery Silicon-based anode material Mesoporous structure First-principles calculation 

Notes

Funding information

This work was financially supported by the National Natural Science Foundation of China (Nos. 21501015, 51604042, 31527803, 51774051, and 21545010).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Zhongliang Xiao
    • 1
  • Ni Xia
    • 1
  • Liubin Song
    • 1
    Email author
  • Zhong Cao
    • 1
  • Huali Zhu
    • 2
  1. 1.Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Food EngineeringChangsha University of Science and TechnologyChangshaChina
  2. 2.School of Physics and Electronic ScienceChangsha University of Science and TechnologyChangshaChina

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