Bimetallic zeolitic imidazolate framework-derived substrate-free anode with superior cyclability for high-capacity lithium-ion batteries

Bhavana Joshi, Edmund Samuel, Yong il Kim, Govindasami Periyasami, Mostafizur Rahaman, Sam S. Yoon

Research output: Contribution to journalArticlepeer-review

Abstract

Freestanding carbon nanofibers loaded with bimetallic hollow nanocage structures were synthesized. The nanocages inherited the rhombic dodecahedral morphology of the zeolitic imidazolate framework (ZIF) precursors, ZIF-8 and ZIF-67. As anode materials for lithium-ion batteries (LIBs), the bimetallic nanocage-loaded freestanding carbon nanofibers effectively buffered volume expansions and alleviated pulverization through their different reduction and oxidation potentials. The higher capacities of the composite anodes arose via the formation of the LixZn alloy and Li2O by Zn and Co ions, respectively, and the enhanced conductivity conferred by the carbon nanofibers. A synergistic effect of the composite components toward the strong electrochemical performance (688 mA h·g−1 at 1200 mA·g−1) of the bimetallic nanocage-loaded fibers was demonstrated through the superior long-term stability of the anode (1048 mA h·g−1 after 300 cycles at 100 mA·g−1), suggesting that the fabricated anode can be a promising material for use in portable LIBs.

Original languageEnglish
Pages (from-to)116-126
Number of pages11
JournalJournal of Materials Science and Technology
Volume67
DOIs
Publication statusPublished - 2021 Mar 20

Keywords

  • Carbon nanofiber
  • Composite anode
  • Nanostructure
  • Zeolitic imidazolate framework

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Polymers and Plastics
  • Metals and Alloys
  • Materials Chemistry

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