Vertically aligned Si@reduced graphene oxide frameworks for binder-free high-areal-capacity Li-ion battery anodes

Sung Woo Park, Hyun Jung Shin, Young Jin Heo, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, lamellar-structured, vertically aligned silicon@reduced graphene oxide frameworks (VA-Si@rGO) are developed for binder-free, high-areal-capacity lithium ion battery (LiB) anodes. First, SiO2/rGO frameworks with unidirectional pores are constructed via the gelation of SiO2/graphene oxide sol and subsequent freeze-casting. Afterwards, the sturdy constructed frameworks are maintained during a series of processes, namely magnesiothermic reduction, acid etching, and thermal carbon coating, which result in carbon-coated VA-Si@rGO. The electrode exhibits a high specific capacity, reversibility, and cycle stability, which are attributed to its unique inner porous structure, high Si yield, and uniform carbon layers. A high areal capacity of approximately 9 mAh cm−2 could be achieved by increasing the initial sol concentration up to 23.5 wt%. Furthermore, even at a high current density of 3 mA cm−2, the electrode delivered a high areal capacity of approximately 6 mAh cm−2 and exhibited excellent stability with a high capacity retention of 68% after the 150th cycle.

Original languageEnglish
JournalInternational Journal of Energy Research
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • binder-free anode
  • high areal capacity
  • lithium-ion battery
  • reduced graphene oxide
  • silicon

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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