Nanocaging Silicon Nanoparticles into a Porous Carbon Framework toward Enhanced Lithium-Ion Storage

Zhidong Hou, Huanyan Liu, Panpan Chen, Jian Gan Wang

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Silicon (Si) shows overwhelming promise as the high-capacity anode material of Li-ion batteries with high energy density. However, Si-based anodes are subjected to a limited electrochemical cycling lifetime due to their large volume change. Herein, a honeycomb-like biomass-derived carbon nanosheet framework is reported to encapsulate Si nanoparticles via a facile molten salt templating method. The carbon framework provides sufficient void space for effectively accommodating the large volume expansion of Si upon Li+ insertion. Moreover, the interconnected carbon skeletons afford fast electron/ion transport pathways for improving the reaction kinetics. Consequently, the porous Si/carbon composite could exhibit a high and stable Li storage capacity of 1022 mAh g−1 at 0.2 A g−1 over 100 cycles along with superior rate capability (555 mAh g−1 at 5 A g−1). This study demonstrates an effective structural design strategy for Si-based anodes toward stable lithium energy storage.

Original languageEnglish
Article number2100107
JournalParticle and Particle Systems Characterization
Volume38
Issue number9
DOIs
StatePublished - Sep 2021

Keywords

  • anodes
  • Li-ion batteries
  • long lifetime
  • molten salt templating
  • Si/carbon

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