Hierarchically designed ZIF-8-derived Ni@ZnO/carbon nanofiber freestanding composite for stable Li storage

Bhavana Joshi, Edmund Samuel, Yong Il Kim, Min Woo Kim, Hong Seok Jo, Mark T. Swihart, Woo Young Yoon, Sam S. Yoon

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)


We present a uniform rhombohedral Ni@ZnO bimetallic oxide host over carbon nanofibers (CNF) as an anode material for Li-ion batteries. Ni@ZnO was produced by annealing a Ni@zeolitic imidazolate framework (ZIF-8) hierarchically decorated over CNFs. The rationally-designed freestanding composite exhibited promising stability in electrochemical performance. A first reversible capacity of 1051 mA·h·g−1 was measured at a current density of 100 mA·g−1, and 88% of this capacity was retained after 100 cycles. We attribute this high capacity retention to the hierarchical structure of the Ni@ZnO-enwrapped carbon framework encapsulating the conductive CNFs, as demonstrated by scanning and transmission electron microscopy. The composite electrode also showed a high specific capacity of ∼497 mA·h·g−1 in high-rate testing at 1000 mA·g−1, because the cage-like framework of the material allowed rapid charge transfer and Li-ion diffusion in the anode.

Original languageEnglish
Pages (from-to)127-134
Number of pages8
JournalChemical Engineering Journal
Publication statusPublished - 2018 Nov 1


  • Anode
  • Lithium ion battery
  • MOF
  • Nanofiber
  • Ni@ZIF-8

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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