A molecular sieve-containing protective separator to suppress the shuttle effect of redox mediators in lithium-oxygen batteries
作者机构：State Key Laboratory of New Ceramics and Fine ProcessingSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China High-Tech Institute of Xi’anXi’an 710025China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2023年第16卷第7期
页 面：9453-9460页
核心收录：
学科分类：0808[工学-电气工程] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学]
基 金：This work was financially supported by the National Natural Science Foundation of China(Nos.U21A2080 and 51788104) Beijing Natural Science Foundation(No.L223008) National Key Research and Development Program of China(No.2022YFB2404403)
主 题：lithium-oxygen batteries redox mediators shuttle effects protective separators zeolite molecular sieves
摘 要：Lithium-oxygen(Li-O_(2))batteries have a great potential in energy storage and conversion due to their ultra-high theoretical specific energy,but their applications are hindered by sluggish redox reaction kinetics in the charge/discharge *** mediators(RMs),as soluble catalysts,are widely used to facilitate the electrochemical processes in the Li-O_(2)batteries.A drawback of RMs is the shuttle effect due to their solubility and mobility,which leads to the corrosion of a Li metal anode and the degradation of the electrochemical performance of the ***,we synthesize a polymer-based composite protective separator containing molecular *** nanopores with a diameter of 4Åin the zeolite powder(4A zeolite)are able to physically block the migration of 2,2,6,6-tetramethylpiperidinyloxy(TEMPO)molecules with a larger size;therefore,the shuttle effect of TEMPO is *** the assistance of the zeolite molecular sieves,the cycle life of the Li-O_(2)batteries is significantly extended from~20 to 170 cycles at a current density of 250 mA·g^(-1)and a limited capacity of 500 mAh·g^(-1).Our work provides a highly effective approach to suppress the shuttle effects of RMs and boost the electrochemical performance of Li-O_(2)batteries.
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