Quasi-solid-state lithium-sulfur battery using room temperature ionic liquid-li-salt-fumed silica nanoparticle composites as electrolytes

Hideyuki Ogawa, Atsushi Unemoto, Itaru Honma

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)

    Abstract

    A quasi-solid-state composite electrolyte, consisting of N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoromethanesulfonyl) amide (DEME-TFSA)-lithium bis(trifluoromethanesulfonyl)amide (Li-TFSA)-fumed silica nanoparticles, has been prepared for use in the electrolyte of a lithium-sulfur battery. Regardless of the solid-state like appearance, the quasi-solid-state electrolyte exhibited a high liquid-like apparent conductivity of 1.2 × 10-4 S cm-1 at 308 K when the volume ratio of DEME-TFSA-Li-TFSA is 75% in the quasi-solid-state composite. By using the quasi-solid-state electrolyte, a quasi-solid-state lithium-sulfur battery was developed and the cell performance was evaluated. The cell has successfully exhibited initial discharge capacities of 1370 mAh g-1 at 308 K with a 0.05 C via the conversion reaction of sulfur and lithium. During 10 charge-discharge cycles, the discharge capacity decreased to 600 mAh g -1 due to the lower utilization ratio of sulfur by agglomeration of Li2S at the electrode/electrolyte interface.

    Original languageEnglish
    Pages (from-to)765-767
    Number of pages3
    JournalElectrochemistry
    Volume80
    Issue number10
    DOIs
    Publication statusPublished - 2012 Oct

    Keywords

    • Quasi-solid-state electrolyte
    • Quasi-solid-state lithium-sulfur battery
    • Room temperature ionic liquid

    ASJC Scopus subject areas

    • Electrochemistry

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