4.7 Article

Trifunctional imidazolium bromide: a high-efficiency redox mediator for high-performance Li-O2 batteries

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CHEMICAL COMMUNICATIONS
卷 59, 期 60, 页码 9215-9218

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ROYAL SOC CHEMISTRY
DOI: 10.1039/d3cc01932b

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In this study, 1-aminopropyl-3-methylimidazolium bromide (APMImBr) was introduced in dimethyl sulfoxide-based Li-O-2 batteries. The bromide ions act as a redox mediator to catalyze the decomposition of Li2O2 products. Additionally, APMIm(+) serves as a scavenging agent for superoxide radicals and protects the lithium metal anodes with an in situ formed Li3N-rich solid electrolyte interface layer. As a result, the Li-O-2 batteries containing APMImBr exhibited an increased discharge capacity, reduced charge overpotential of approximately 0.61 V, and prolonged cyclic life of over 200 cycles.
In this work, 1-aminopropyl-3-methylimidazolium bromide (APMImBr) is introduced in dimethyl sulfoxide-based Li-O-2 batteries. The Br- functions as a redox mediator to catalyze the decomposition of the Li2O2 products. Meanwhile, the APMIm(+) serves as a scavenging agent for superoxide radicals as well as protects the lithium metal anodes via an in situ formed Li3N-rich solid electrolyte interface layer. As a result, the Li-O-2 batteries containing APMImBr delivered an enlarged discharge capacity, a reduced charge overpotential of around 0.61 V and a prolonged cyclic life of over 200 cycles.

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