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

4 Citations (Scopus)

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
Pages (from-to)9704-9712
Number of pages9
JournalInternational Journal of Energy Research
Volume45
Issue number6
DOIs
Publication statusPublished - 2021 May

Bibliographical note

Funding Information:
National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT, Grant/Award Numbers: 2019R1A2B5B02070203, 2018M3D1A1058744; Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Grant/Award Number: 2020R1A6A3A13070199 Funding information

Funding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2020R1A6A3A13070199), and the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT (2019R1A2B5B02070203, 2018M3D1A1058744).

Publisher Copyright:
© 2021 John Wiley & Sons Ltd

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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