Superior electrochemical properties of micron-sized aggregates of (Co0.5Fe0.5)3O4 hollow nanospheres and graphitic carbon

Young Jun Hong, Seung Keun Park, Kwang Chul Roh, Jung Kul Lee, Yun Chan Kang

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    Morphology-controlled micron-sized aggregates consisted of hollow nanospheres and graphitic carbon are considered to be efficient electrode materials for lithium-ion batteries because the advantages of hollow nanospheres are combined with those of micron-size powders with easy processability. In this study, carbon microspheres with extremely large surface area of 3350 m2 g−1 are successfully used as templates to synthesize (Co0.5Fe0.5)3O4-graphitic carbon (CoFeO-GC) composite microspheres, which in turn, are composed of hollow nanospheres. The CoFe alloy nanospheres act as catalyst in formation of graphitic carbon during reduction process and transform into metal oxide hollow nanospheres after oxidation by nanoscale Kirkendall diffusion. Owing to their unique structure, CoFeO-GC composite microspheres show lithium-ion storage performances superior to those of the CoFeO-amorphous carbon composites with ultrafine nanocrystals and dense structure. The CoFeO-GC composite microspheres have extremely high capacities of 1072 and 681 mA h g−1 at current densities of 1 and 3 A g−1, respectively, after 350 cycles. This hybrid structure employs synergistic effect of the hollow nanosphere aggregate and high content of graphitic carbon with high electrical conductivity, resulting in superior cycling and rate performances, when tested as anode materials for lithium-ion batteries.

    Original languageEnglish
    Pages (from-to)351-360
    Number of pages10
    JournalChemical Engineering Journal
    Volume346
    DOIs
    Publication statusPublished - 2018 Aug 15

    Bibliographical note

    Funding Information:
    This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIP) (No. 2017R1A2B2008592). This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2017R1A4A1014806), This work was supported by the Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (20153030091450).

    Funding Information:
    This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIP) (No. 2017R1A2B2008592 ). This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning ( NRF-2017R1A4A1014806 ), This work was supported by the Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy , Republic of Korea ( 20153030091450 ).

    Publisher Copyright:
    © 2018 Elsevier B.V.

    Keywords

    • Carbon composite
    • Carbonaceous microspheres
    • Kirkendall diffusion
    • Lithium-ion batteries
    • Nanostructured material

    ASJC Scopus subject areas

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

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