Sulfur-containing soft Lewis base polymers for improved lithium-ion conductivity under polymer-in-salt conditions

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  • Akinari Chiba
    Department of Applied Chemistry, and Research Institute for Science and Engineering, Waseda University, 3-chōme-4-1 Ōkubo, Shinjuku City, Tokyo 169-8555, Japan
  • Kan Hatakeyama-Sato
    Department of Applied Chemistry, and Research Institute for Science and Engineering, Waseda University, 3-chōme-4-1 Ōkubo, Shinjuku City, Tokyo 169-8555, Japan
  • Kenichi Oyaizu
    Department of Applied Chemistry, and Research Institute for Science and Engineering, Waseda University, 3-chōme-4-1 Ōkubo, Shinjuku City, Tokyo 169-8555, Japan

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<jats:title>Abstract</jats:title> <jats:p>Solid polymer electrolytes have been intensively studied to improve the safety and energy density of lithium-ion batteries (LiBs). Although high-rate performance of LiBs has been reported in electrolytes under polymer-in-salt conditions with an excess of lithium salts and polymers, effective conditions for achieving high ionic conductivity remain unresolved. In this study, we elucidate the mechanism and high Li-ion transportability of poly(sulfone-thioether) under polymer-in-salt conditions. In particular, the composition of the polymer with an asymmetric Li salt, lithium(fluorosulfonyl)(trifluoromethane sulfonyl)imide (LiFTFSI), induced a high ionic conductivity above 10−5 S/cm, which is higher than that of the poly(ethylene oxide) (PEO)-Li salt system. Under polymer-in-salt conditions, the enhanced conductivity of poly(sulfone-thioether) contrasts with the conductivity drop observed in the conventional PEO system. These results show the superiority of polymers with soft Lewis bases, such as sulfur donor atoms, for Li-ion transport under polymer-in-salt conditions.</jats:p>

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