Activated lithium-metal-oxides as catalytic electrodes for Li-O 2 cells

L. Trahey, C. S. Johnson, J. T. Vaughey, S. H. Kang, L. J. Hardwick, S. A. Freunberger, P. G. Bruce, M. M. Thackeray

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Lithium-metal oxides with a high formal Li 2 O content, such as Li 5 FeO 4 (5Li 2 OFe 2 O 3 ) and a Li 2 MnO 3 LiFeO 2 composite (Li 2 OMnO 2 Li 2 OFe 2 O 3 ) have been explored as electrocatalysts for primary and rechargeable Li-O 2 cells. Activation occurs predominantly by Li 2 O removal, either electrochemically or chemically by acid-treatment. Superior electrochemical behavior is obtained if activation occurs by acid-treatment; Li 2 MnO 3 LiFeO 2 catalysts provide 2516 mAh/g (carbon) corresponding to 931 mAh/g (electrocatalyst carbon) during the initial discharge. The reaction is reasonably reversible during the early cycles. The approach has implications for designing electrocatalysts that participate through electrochemical Li 2 O extraction/reformation reactions, offering exceptionally high capacities.

    Original languageEnglish
    JournalElectrochemical and solid-state letters
    Volume14
    Issue number5
    DOIs
    Publication statusPublished - 16 Mar 2011

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    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Materials Science(all)
    • Physical and Theoretical Chemistry
    • Electrochemistry
    • Electrical and Electronic Engineering

    Fields of Expertise

    • Advanced Materials Science

    Cite this

    Trahey, L., Johnson, C. S., Vaughey, J. T., Kang, S. H., Hardwick, L. J., Freunberger, S. A., ... Thackeray, M. M. (2011). Activated lithium-metal-oxides as catalytic electrodes for Li-O 2 cells. Electrochemical and solid-state letters, 14(5). https://doi.org/10.1149/1.3555366