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

    65 Citations (Scopus)

    Abstract

    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
    Volume351
    DOIs
    Publication statusPublished - 2018 Nov 1

    Bibliographical note

    Publisher Copyright:
    © 2018 Elsevier B.V.

    Keywords

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

    ASJC Scopus subject areas

    • General Chemistry
    • Environmental Chemistry
    • General Chemical Engineering
    • Industrial and Manufacturing Engineering

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