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作者

Baoxing Wang, Jiaheng Liu, Chenghui Mao, Fang Wang, Shuai Yuan, Xizhang Wang, Zheng Hu

作者单位

Affiliations ¹ Key Laboratory of Mesoscopic Chemistry of MOE, State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China. ² School of Resource & Environment and Safety Engineering, Jining University, Qufu, Shandong, 273155, P. R. China. ³ Translational Pharmaceutical Laboratory, Jining First People's Hospital, Shandong First Medical University, Jining, Shandong, 272000, P. R. China.

刊名

Small (Weinheim an der Bergstrasse, Germany)

年份

2024

页码

e2401231

ISSN

1613-6829

关键词

MOF‐gel/celgard separator Ru(acac)3 (ruthenium acetylacetonate) lithium‐oxygen battery redox mediator shuttle effect.

摘要

Redox mediators are widely utilized in the electrolytes of Li-O batteries to catalyze the formation/decomposition of LiO, which significantly enhances the cycling performance and reduces the charge overpotential. However, RMs have a shuttle effect by migrating to the Li anode side and inducing Li metal degradation through a parasitic reaction. Herein, a metal-organic framework gel separator is proposed to restrain the shuttling of RMs. Compared to traditional MOF nanoparticles, MOF gels form u...更多

Redox mediators are widely utilized in the electrolytes of Li-O batteries to catalyze the formation/decomposition of LiO, which significantly enhances the cycling performance and reduces the charge overpotential. However, RMs have a shuttle effect by migrating to the Li anode side and inducing Li metal degradation through a parasitic reaction. Herein, a metal-organic framework gel separator is proposed to restrain the shuttling of RMs. Compared to traditional MOF nanoparticles, MOF gels form uniform and dense films on the separators. When using Ru as an RM, the MOF-gel separator suppresses the shuttling of Ru toward the Li anode side and significantly enhances the performance of Li-O batteries. Specifically, Li-O batteries exhibit an ultralong cycling life at a current density of 0.5 A g. Moreover, the batteries using the MOF-gel/celgard separator exhibit significantly improved cycling performance at a high current density of 1.0 A g and a decreased charge/discharge overpotential. This result is expected to guide future development of battery separators and the exploration of redox mediators.收起

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