4.8 Article

Suppressing Singlet Oxygen Formation during the Charge Process of Li-O2 Batteries with a Co3O4 Solid Catalyst Revealed by Operando Electron Paramagnetic Resonance

期刊

JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 12, 期 42, 页码 10346-10352

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c02928

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资金

  1. National Natural Science Foundation of China [21802044, 21872055]
  2. National Natural Science Foundation of China for Excellent Young Scholars [21522303]

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Using Co3O4 as a catalyst in Li-O-2 batteries can suppress the generation of O-1(2), which is known to cause higher overpotential and parasitic reactions. The catalyst reduces the amount of LiO2-like species in discharge products, leading to the suppression of O-1(2) formation.
Aprotic lithium-oxygen (Li-O-2) batteries promise high energy, but the cycle life has been plagued by two major obstacles, the insulating products and highly reactive singlet oxygen (O-1(2)), which cause higher overpotential and parasitic reactions, respectively. A solid-state catalyst is known to reduce overpotential; however, it is unclear whether it affects O-1(2) generation. Herein, Co3O4 was employed as the representative catalyst in Li-O-2 batteries, and O-1(2) generation was investigated by ex-situ and operando electron paramagnetic resonance (EPR) spectroscopy. By comparing a carbon nanotube (CNT) cathode with a Co3O4/CNT cathode, we find that O-1(2) generation in the charge process can be suppressed by the Co(3)O(4 )catalyst. After carefully studying the discharge products on the two electrodes and the corresponding decomposition processes, we conclude that a LiO2-like species is responsible for the O-1(2) generation during the early charge stage. The Co(3)O(4 )catalyst reduces the amount of LiO2-like species in discharge products, and thus the O-1(2) formation is suppressed.

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