Dependence of Al2O3 coating thickness and annealing conditions on microstructural and electrochemical properties of LiCoO 2 film

Sun Gyu Park, Seong Rae Lee, Won Il Cho, Byung Won Cho

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    Porous Y-doped (Ba,Sr)TiO3 ceramics were prepared by the spark plasma sintering of (Ba,Sr)TiO3 powders with different amounts of carbon black, and by subsequently burning out the carbon black acting as a pore precursor. The microstructure, PTCR and gas-sensing characteristics for porous Y-doped (Ba,Sr)TiO3 ceramics were investigated. Spark plasma sintered (Ba,Sr)TiO3 ceramics revealed a very fine microstructure containing submicron-sized grains with a cubic phase and revealed an increased porosity after the carbon black was burned out. As a result of reoxidation treatment, the grain size of the (Ba,Sr)TiO3 ceramics increased to a few and mu;m and the cubic phase transformed into a tetragonal phase. The phase transformation of (Ba,Sr)TiO3 ceramics was affected by grain size. The PTCR jump in the (Ba,Sr)TiO3 ceramics prepared by adding 40 vol.% carbon black showed an excellent value of 4.72 and times; 10 6 , which was ten times higher than the PTCR jump in (Ba,Sr)TiO3 ceramics. The electrical resistivity of the porous (Ba,Sr)TiO3 ceramics was recovered as the atmosphere changed from a reducing gas (N2) to an oxidizing gas (O2) under consecutive heating and cooling cycles.

    Original languageEnglish
    Pages (from-to)93-98
    Number of pages6
    JournalMetals and Materials International
    Volume16
    Issue number1
    DOIs
    Publication statusPublished - 2010 Feb

    Bibliographical note

    Funding Information:
    This work was financially supported by the program Development of Basic Technology for Next Generation Li-Composite Secondary Batteries of KIST.

    Keywords

    • Electrical properties
    • Grain boundary
    • Grain growth
    • Microstructure
    • Sintering

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys
    • Materials Chemistry

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