Ultrafast Charge/Discharge by a 99.9% Conventional Lithium Iron Phosphate Electrode Containing 0.1% Redox-Active Fluoflavin Polymer

Kan Hatakeyama-Sato, Tomoki Akahane, Choitsu Go, Takahiro Kaseyama, Takuji Yoshimoto, Kenichi Oyaizu*

*この研究の対応する著者

研究成果: Article査読

11 被引用数 (Scopus)

抄録

Exceptionally large output (current density over 20 mA/cm2) is achieved by a 99.9 wt % conventional LiFePO4 cathode for lithium ion batteries. Adding just 0.1 wt % redox-active fluoflavin polymer to the electrode improves the electrochemical performance dramatically. The polymer's redox potentials of 3.3 and 3.7 V vs Li/Li+, sandwiching that of LiFePO4 (3.4 V), are critical in accelerating the charge and discharge processes by electrochemical mediation. The lower overvoltage also helps to suppress electrode degradation and improve the cycle life of the cell (over 1000 cycles). The DC pulse technique reveals the transient, dynamic electrochemical mediation, which cannot be observed by conventional steady-state impedance spectroscopy. These dramatic improvements in material properties achieved by the catalytic amount of the organic additive (0.1 wt %) give new insights into organic/inorganic hybrid chemistry and may lead to the development of energy-related materials with improved properties.

本文言語English
ページ(範囲)1712-1717
ページ数6
ジャーナルACS Energy Letters
5
5
DOI
出版ステータスPublished - 2020 5月 8

ASJC Scopus subject areas

  • 化学(その他)
  • 再生可能エネルギー、持続可能性、環境
  • 燃料技術
  • エネルギー工学および電力技術
  • 材料化学

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