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 journalArticle

21 Citations (Scopus)

Abstract

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
Volume327
DOIs
Publication statusPublished - 2017 Nov 1

Keywords

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

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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