Contribution of randomly oriented Li2WO4 with tetragonal symmetry to Li+ ion transfer resistance reduction in lithium-ion batteries

Tetsutaro Hayashi, Eiji Toda, Ryuichi Kuzuo, Yasutaka Matsuda, Naoaki Kuwata, Junichi Kawamura

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    In this study, we used pulsed laser deposition to fabricate a thin-film electrode of LiCoO2 (LCO) modified with lithium tungsten oxide (LWO). Then, to investigate the mechanisms underlying the low interfacial resistance of the modified electrode, we determined the diffusion coefficients of the Li+ ions in the bare and LWO-modified LCO and the three-dimensional structure of the LWO. Using electrochemical impedance spectroscopy, we determined that the LWO modification of the LCO enhanced the diffusion coefficient of the Li+ ions. XRD analysis showed that the LWO adopted a randomly oriented Li2WO4 structure with tetragonal symmetry displaying multiple Li+ ion diffusion paths, which contributed to enhancing the diffusion of Li+ ions between the positive electrode surface and liquid electrolyte, resulting in reduction of resistance to interfacial Li+ ion transfer.

    Original languageEnglish
    Pages (from-to)8150-8157
    Number of pages8
    JournalInternational Journal of Electrochemical Science
    Volume10
    Issue number10
    Publication statusPublished - 2015 Jan 1

    Keywords

    • Lithium tungsten oxide
    • Lithium-ion battery
    • Low resistance
    • Positive electrode
    • Surface modification

    ASJC Scopus subject areas

    • Electrochemistry

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