Highly porous carbon-coated silicon nanoparticles with canyon-like surfaces as a high-performance anode material for Li-ion batteries

Bokyung Kim, Jihoon Ahn, Yunjung Oh, Jeiwan Tan, Daehee Lee, Jin Kyu Lee, Jooho Moon

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

This paper reports unique highly porous carbon-coated Si nanoparticles with canyon-like surfaces (cpSi@C) prepared by pseudomorphic transformation of wrinkled silica nanoparticles (WSNs) via magnesiothermic reduction and subsequent pyrolytic deposition of carbon. The pseudomorphic transformation of soft-template-based WSNs with large pore dimensions provides Si nanoparticles with additional porosity owing to their unique canyon-like surface structure. This degree of porosity is not achievable using conventional soft-template-derived porous SiO2 materials owing to their smaller pore dimensions. The free volume space in the cpSi@C particles is 419% of their Si volume, which is sufficient to fully accommodate Si volume expansion during cycling. Furthermore, the conformal carbon coating allows cpSi@C to enhance its electrical conductivity. cpSi@C exhibits a high specific charge capacity of 822 mA h g-1 after 200 cycles at a current density of 0.5 A g-1, which is 59.1% of the initial charge capacity. A comparative study with respect to other porous Si-based materials clearly revealed that the unique canyon-like structure synthesized in this study, with its additional pore volume and smaller Si dimensions, exhibits enhanced electrochemical performance.

Original languageEnglish
Pages (from-to)3028-3037
Number of pages10
JournalJournal of Materials Chemistry A
Volume6
Issue number7
DOIs
Publication statusPublished - 2018 Jan 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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