Electrochemical characteristics of copper silicide-coated graphite as an anode material of lithium secondary batteries

In Chul Kim, Dongjin Byun, Sangwha Lee, Joong Kee Lee

    Research output: Contribution to journalArticlepeer-review

    22 Citations (Scopus)

    Abstract

    Copper silicide-coated graphite as an anode material was prepared by the sequential employments of plasma enhanced chemical vapor deposition (PECVD) and radio frequency magnetron sputtering (RFMS) method at 300 °C. The silicon-coated graphite exhibited an initial discharge capacity of 540 mAh/g with 76% coulomb efficiency, and the discharge capacity was sharply decreased down to 50% of initial capacity after 30 cycles, probably due to large volume changes during the charge-discharge cycling. Copper silicide-coated graphite, however, exhibited an initial discharge capacity of 480 mAh/g with higher retention capacity of 87% even after 30 cycles, probably due to the enhanced interfacial conductivity. The copper silicide film on the graphite surface played as the active anode material of lithium secondary batteries via the reduction of interfacial resistance and mitigation of volume changes during repeated cycles.

    Original languageEnglish
    Pages (from-to)1532-1537
    Number of pages6
    JournalElectrochimica Acta
    Volume52
    Issue number4
    DOIs
    Publication statusPublished - 2006 Dec 1

    Keywords

    • Anode active material
    • Copper silicide
    • Lithium secondary batteries
    • PECVD
    • rf-Magnetron sputtering

    ASJC Scopus subject areas

    • General Chemical Engineering
    • Electrochemistry

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