Issue 6, 2022

Kinetic square scheme in oxygen-redox battery electrodes


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.

Graphical abstract: Kinetic square scheme in oxygen-redox battery electrodes

Supplementary files

Article information

Article type
09 Nov 2021
25 Mar 2022
First published
18 May 2022
This article is Open Access
Creative Commons BY license

Energy Environ. Sci., 2022,15, 2591-2600

Kinetic square scheme in oxygen-redox battery electrodes

K. Kawai, X. Shi, N. Takenaka, J. Jang, B. M. de Boisse, A. Tsuchimoto, D. Asakura, J. Kikkawa, M. Nakayama, M. Okubo and A. Yamada, Energy Environ. Sci., 2022, 15, 2591 DOI: 10.1039/D1EE03503G

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