Tailored silicon hollow spheres with Micrococcus for Li ion battery electrodes

Yeongjae Yi, Gwang Hee Lee, Jae Chan Kim, Hyun Woo Shim, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


The porous Si hollow spheres (p-Si HSs), which feature interconnected Si nanostructures decorated with spherical-type Micrococcus bacteria, were synthesized by a combination of magnesiothermic reduction and byproduct removal and were subsequently studied as an anode material for lithium-ion batteries (LIBs). The p-Si HSs offer a high lithium-ion storage capacity because of their numerous active sites and large electrolyte contact area stemming from their large specific surface area (∼313.7 m2 g−1); in addition, their large pore volume (∼0.927 cm3 g−1) buffers large volume changes during the lithiation/delithiation processes, which is important for improving the cycle stability of anode materials. Furthermore, carbon coating resulted in the formation of a stable solid electrolyte interface through minimization of the Si/electrolyte contact area and also offered an efficient electronic conduction pathway, corresponding with improved lithium reactivity of the active Si materials. The lithium-ion diffusion coefficient of the non-clogging carbon-coated p-Si HSs was approximately five times greater than that of the p-Si HSs. As a result, the designed composite nanostructured electrodes demonstrated excellent cycle stability and superior rate capability.

Original languageEnglish
Pages (from-to)297-306
Number of pages10
JournalChemical Engineering Journal
Publication statusPublished - 2017

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science, ICT, and Future Planning (Nos. 2016R1A2B2012728 and 2016M3A7B4909318).

Publisher Copyright:
© 2017 Elsevier B.V.


  • Hollow sphere
  • Li ion battery
  • Magnesiothermic
  • Micrococcus
  • Silicon

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


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