Hexafluorophosphate-Bis(trifluoromethanesulfonyl)imide anion co-intercalation for increased performance of dual-carbon battery using mixed salt electrolyte

Jose C. Madrid Madrid, Kotaro Nakamura, Keisuke Inda, Lukas Haneke, Andreas Heckmann, Joop Enno Frerichs, Michael Ryan Hansen, Tobias Placke, Martin Winter, Motonori Watanabe, Atsushi Takagaki, Taner Akbay, Tatsumi Ishihara

研究成果: Contribution to journalArticle査読

1 被引用数 (Scopus)

抄録

Co-intercalation of Hexafluorophosphate(PF6ˉ) and Bis(trifluoromethane sulfonyl)imide (TFSIˉ) anions as a result of the use of a mixed salt of LiPF6 and LiTFSI is studied for the increased performance of a dual-carbon battery (DCB). Unlike the fluorine- or the imide-based anions (e.g., PF6ˉ and TFSIˉ), the cluster formation between co-intercalated PF6ˉ and TFSIˉ in the positive electrode of a DCB results in achieving high discharge capacities with significantly increased cycle properties. A reversible discharge capacity of 85 mAh/g-cathode over 350 cycles with no significant degradation is presented. The Coulombic efficiency of almost 100% is reached after the initial 10 cycles and suitable rate property is also observed. F NMR analysis on graphitic carbon intercalated with PF6ˉ and TFSIˉ suggests the interaction between two anions and ratio of intercalated PF6 and TFSI was changed by applied voltage, resulting in the increased stability of the intercalated structure which is also supported by the first principles calculations.

本文言語英語
論文番号229084
ジャーナルJournal of Power Sources
479
DOI
出版ステータス出版済み - 12 15 2020

All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • エネルギー工学および電力技術
  • 物理化学および理論化学
  • 電子工学および電気工学

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