Surface coating layer on li metal for increased cycle stability of Li-O2 batteries

Il Chan Jang, Shintaro Ida, Tatsumi Ishihara

    Research output: Contribution to journalArticlepeer-review

    23 Citations (Scopus)

    Abstract

    The effects of polymer coating on the cycle stability of Li-O2 batteries were investigated. Capacity fading is much higher with increasing Li utilization; however, it was found that coating the Li metal with poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) highly and effectively increased the cycle stability of a Li-O2 battery. This indicates that the coating may prevent shape changes of the metal during discharge and charge cycles. Impedance analysis suggested that the interfacial resistance on the anode compartment explained the low cycle stability in cells containing pristine Li. The PVdF-HFP coating suppressed this interfacial resistance during discharge-charge cycles performed at current densities exceeding 0.1 mA/cm2. Microscopy studies showed that lithium morphology deposited on the polymer coated electrode showed suppressed needle-like dendrite formation explaining the increase in the cycle stability of Li-O2 batteries.

    Original languageEnglish
    JournalJournal of the Electrochemical Society
    Volume161
    Issue number5
    DOIs
    Publication statusPublished - 2014

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Renewable Energy, Sustainability and the Environment
    • Condensed Matter Physics
    • Surfaces, Coatings and Films
    • Materials Chemistry
    • Electrochemistry

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