A molecular sieve-containing protective separator to suppress the shuttle effect of redox mediators in lithium-oxygen batteries

查看全文 作　　者：Xinbin [1,2]Wu;Huiping [1]Wu;Shundong [1]Guan;Ying [1]Liang;Kaihua [1]Wen;Huanchun [2]Wang;Xuanjun [2]Wang;Ce-Wen [1]Nan;Liangliang [1]Li 机构地区：[1]State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China;[2]High-Tech Institute of Xi’an,Xi’an 710025,China 出　　处：《Nano Research》索引2023年第16卷第7期,共8页 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). 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 processes.Redox 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 batteries.Herein,we synthesize a polymer-based composite protective separator containing molecular sieves.The 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 restrained.With 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. 关 键 词：lithium-oxygen batteries redox mediators shuttle effects protective separators zeolite molecular sieves