Electrochemical performance and thermal stability of iron oxyfluoride (FeOF) for sodium-ion batteries

Ayuko Kitajou, Liwei Zhao, Rintaro Nagano, Atsushi Inoishi, Eiji Kobayashi, Shigeto Okada

研究成果: ジャーナルへの寄稿記事

抄録

Self-synthesized rutile iron oxyfluoride (FeOF) was studied as a cathode material for Na-ion batteries. The highly crystalline FeOF provided an initial discharge capacity of 246 mAhg-1 in a voltage range of 1.0–4.0 V, followed by 88% of capacity retention after 20 cycles. This discharge-charge reaction of FeOF between 0.8 and 4.0 V are advanced by the Fe2+ /Fe3+ redox reaction. That is, no conversion reaction was involved in the application of FeOF as a cathode material for Na-ion batteries because of the low potential of Na-insertion. In addition, the structure change of FeOF from rutile to cubic during Na ion insertion, which was similar to that in Li-ion batteries. No remarkable HF release was detected even up to 700°C, indicating a low toxic risk of the FeOF cathode. The thermal properties of sodiated and desodiated FeOF electrodes in the associated electrolyte were investigated by DSC (Differential scanning calorimetry) up to 500°C. Sodiated FeOF electrodes showed larger exothermic heat generation than desodiated ones, especially at a temperature higher than 380°C. Finally, the thermal stability of FeOF cathodes in the associated Li-and Na-ion battery electrolytes was quantitatively compared with variations of the electrode/electrolyte ratio.

元の言語英語
記事番号68
ジャーナルBatteries
4
発行部数4
DOI
出版物ステータス出版済み - 12 1 2018

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Cathodes
Thermodynamic stability
Iron
Sodium
Ions
Electrolytes
Electrodes
Redox reactions
Poisons
Heat generation
Differential scanning calorimetry
Thermodynamic properties
Crystalline materials
fluorine monoxide
Electric potential
Temperature
titanium dioxide

All Science Journal Classification (ASJC) codes

  • Electrochemistry
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

これを引用

Electrochemical performance and thermal stability of iron oxyfluoride (FeOF) for sodium-ion batteries. / Kitajou, Ayuko; Zhao, Liwei; Nagano, Rintaro; Inoishi, Atsushi; Kobayashi, Eiji; Okada, Shigeto.

:: Batteries, 巻 4, 番号 4, 68, 01.12.2018.

研究成果: ジャーナルへの寄稿記事

Kitajou, Ayuko ; Zhao, Liwei ; Nagano, Rintaro ; Inoishi, Atsushi ; Kobayashi, Eiji ; Okada, Shigeto. / Electrochemical performance and thermal stability of iron oxyfluoride (FeOF) for sodium-ion batteries. :: Batteries. 2018 ; 巻 4, 番号 4.
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