Kinetic square scheme in oxygen-redox battery electrodes

Kosuke Kawai, Xiang Mei Shi, Norio Takenaka, Jeonguk Jang, Benoit Mortemard de Boisse, Akihisa Tsuchimoto, Daisuke Asakura, Jun Kikkawa, Masanobu Nakayama, Masashi Okubo, Atsuo Yamada*

*この研究の対応する著者

研究成果: Article査読

抄録

Integrating an anionic-redox (or oxygen-redox) capacity with a conventional cationic-redox capacity is a promising strategy for large-capacity battery cathodes exceeding present technical limits. However, most oxygen-redox cathodes exhibit a large charge/discharge voltage hysteresis (>0.5 V), resulting in poor energy efficiency and impractical implementation. Here, we show that nonpolarizing O ↔ O2− (4.4 V vs. Li/Li+) and polarizing O22− → O2− (3.3 V vs. Li/Li+) coexist and kinetically compete in O2-type Li1.12-yNi0.17Mn0.71O2. The oxygen-redox reaction is described as a square scheme, involving bond-forming 2O → O22− and bond-cleaving O24− → 2O2− processes, where preventing the formation of O22− is essential to realize non-polarizing and energy-efficient oxygen-redox reactions.

本文言語English
ページ(範囲)2591-2600
ページ数10
ジャーナルEnergy and Environmental Science
15
6
DOI
出版ステータスPublished - 2022 5月 18
外部発表はい

ASJC Scopus subject areas

  • 環境化学
  • 再生可能エネルギー、持続可能性、環境
  • 原子力エネルギーおよび原子力工学
  • 汚染

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