Experimental and computational studies of electrochemical anion intercalation into graphite from target-oriented designed borate-based ionic liquid electrolytes

Kolja Beltrop, Jose Carlos Madrid Madrid, Paul Meister, Andreas Heckmann, Martin Winter, Taner Akbay, Tatsumi Ishihara, Tobias Placke

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    Here, we report on the fundamental experimental and computational analyses of target-oriented designed ionic liquid (IL) electrolytes composed of small and (electro)chemically stable borate-based anions with respect to their anion intercalation/de-intercalation behavior in graphite positive electrodes for dual-ion batteries (DIBs). Due to their relatively small size, borate-based anions (e.g., BF4ˉ) and electrolytes are of high interest for DIB cells in order to achieve a high specific capacity, which can, however, be impeded by electrolyte solvation effects. In order to exclude solvent effects, we develop and synthesize novel room-temperature IL electrolytes (RTILs), i.e., Pyr1101BF4/LiBF4 and Pyr1101CF3BF3/LiCF3BF3, which are characterized with respect to stability and anion intercalation behavior. These studies are combined with computational studies to gain fundamental insights into the electronic structures of the BF4ˉ and CF3BF3ˉ acceptor-type graphite intercalation compounds (GICs), staging stoichiometries, theoretical capacities and anion transport properties.

    Original languageEnglish
    Article number228397
    JournalJournal of Power Sources
    Volume469
    DOIs
    Publication statusPublished - Sep 1 2020

    All Science Journal Classification (ASJC) codes

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

    Fingerprint Dive into the research topics of 'Experimental and computational studies of electrochemical anion intercalation into graphite from target-oriented designed borate-based ionic liquid electrolytes'. Together they form a unique fingerprint.

    Cite this