Enhanced Lithium Storage of an Organic Cathode via the Bipolar Mechanism

Tianyuan Liu, Ki Chul Kim, Byeongyong Lee, Shikai Jin, Michael J. Lee, Mochen Li, Suguru Noda, Seung Soon Jang*, Seung Woo Lee*

*この研究の対応する著者

研究成果: Article査読

15 被引用数 (Scopus)

抄録

Electrochemically polymerized anthraquinone derivatives on conductive carbon nanotubes are redox-active as organic cathode materials for lithium-ion batteries. Density functional theory calculations and electrochemical measurements reveal that the polymerized anthraquinone cathodes exhibit the multiple redox reactions with electrolyte ions through a bipolar charge storage mechanism: (1) the n-type doping/dedoping mechanism associated with Li+ binding in a potential window of 1.5-3.0 V versus Li and (2) the PF6-involved p-type doping/dedoping mechanism in a potential window of 3.0-4.5 V versus Li. Polymerized 1-aminoanthraquinone (AAQ) shows progressive deactivation upon cycling because of the charge trapping effect. On the other hand, the polymerized 1,5-diaminoanthraquinone (DAAQ) delivers extraordinarily high charge capacities up to 311 mA h/g while effectively avoiding undesirable charge trapping behaviors. We establish the relationship between the structure and charge storage performance of the polymerized quinone derivatives, suggesting a high-performance organic cathode material for rechargeable battery applications.

本文言語English
ページ(範囲)3728-3735
ページ数8
ジャーナルACS Applied Energy Materials
3
4
DOI
出版ステータスPublished - 2020 4月 27

ASJC Scopus subject areas

  • 化学工学(その他)
  • エネルギー工学および電力技術
  • 電気化学
  • 材料化学
  • 電子工学および電気工学

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