Carbon-nickel core-shell nanofibers decorated with bimetallic nickel-gallium chalcogenide nanosheets as flexible, binder-free lithium-ion-battery anodes

Yongil Kim, Edmund Samuel, Jungwoo Huh, Seongpil An, Hae Seok Lee, Sam S. Yoon

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We fabricated ultrathin nanosheets of bimetallic chalcogenides (NiGa2S4) using a hydrothermal process, which significantly reduced the number of Li+ diffusion pathways and promoted rapid electron transport. Flexible carbon nanofibers (CNFs) were prepared by electrospinning and post-annealing. These CNFs were electroplated with nickel and decorated with gallium, which has a relatively high theoretical capacity and low volume-expansion rate during lithiation. The gallium concentration was optimized to obtain the thinnest and most uniform NiGa2S4 nanosheets. The optimal anode exhibited a reversible specific capacity of 1349 mAh·g−1 at a current density of 62.5 mA·g−1 in the first cycle. Furthermore, the NiGa2S4 anode was used to power a light-emitting-diode under severe bending conditions, demonstrating its superior mechanical durability.

Original languageEnglish
Pages (from-to)21797-21811
Number of pages15
JournalInternational Journal of Energy Research
Volume46
Issue number15
DOIs
Publication statusPublished - 2022 Dec

Bibliographical note

Publisher Copyright:
© 2022 John Wiley & Sons Ltd.

Keywords

  • bimetallic-chalcogenides (NiGaS) nanosheet
  • carbon nanofiber
  • electroplating
  • electrospinning
  • lithium-ion batteries

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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