Orientation alignment of epitaxial LiCoO2 thin films on vicinal SrTiO3 (100) substrates

Kazunori Nishio, Tsuyoshi Ohnishi, Kazutaka Mitsuishi, Narumi Ohta, Ken Watanabe, Kazunori Takada

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    LiCoO2 is epitaxially grown on SrTiO3 (100) substrates with (104) orientation. Because the LiCoO2 film is grown with its c-axis parallel to four equivalent 〈111〉 axes of the SrTiO3, the (104)-oriented film exhibits four-domain structure on the SrTiO3 (100) substrate. Introducing off-cut angle to the substrate surface breaks the equivalency between the four 〈111〉 axes of the SrTiO3 substrate to induce preferential growth of specific orientation with the c-axis in a descending direction of off-cut surface. Increasing off-cut angle and lowering deposition rate promote the preferential growth, because they facilitate step-flow growth mode, and finally align the c-axes in the domains completely into one 〈111〉 direction of the SrTiO3 substrate. The LiCoO2 film delivers a discharge capacity of 90 mAh g−1 at a low discharge rate of 0.01 C, and 25% of capacity is kept even at a high rate of discharge with 100 C.

    Original languageEnglish
    Pages (from-to)306-310
    Number of pages5
    JournalJournal of Power Sources
    Volume325
    DOIs
    Publication statusPublished - 2016 Sep 1

    Keywords

    • Epitaxial film
    • Lithium cobalt oxide
    • Pulsed laser deposition
    • Thin-film battery
    • Vicinal substrate

    ASJC Scopus subject areas

    • Renewable Energy, Sustainability and the Environment
    • Energy Engineering and Power Technology
    • Physical and Theoretical Chemistry
    • Electrical and Electronic Engineering

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