抑制锂枝晶和穿梭效应的MOFs基Janus隔膜的合成及性能研究

锂硫电池中的穿梭效应和锂枝晶生长是同时存在的关键问题，也是阻挡锂硫电池产业化的挑战性问题。隔膜作为隔离正极、负极的电池关键组件，也是离子通过的必经之所，为同时解决这两个问题提供了机遇。本项目设计MOFs基Janus隔膜应用于锂硫电池中，①利用MOFs丰富有序的孔道，可调的化学环境，协同电解质中的阴离子，诱导锂离子均匀、快速的在MOFs中传导，实现高效抑制锂枝晶生长、高锂离子传导率；②利用混金属MOFs衍生的兼具亲锂性和亲硫性金属的多金属碳化物或多金属单原子催化剂作为高效催化多硫化锂的涂层材料，探究金属种类的协同效应对其催化效果的影响；③优化整合①和②两种MOFs材料于同一轻质Janus隔膜，使得其同时具有高效抑制锂枝晶生长、高锂离子传导率、高效抑制穿梭效应、加快多硫离子反应动力学等多种功能于一体，从而获得高性能锂硫电池隔膜。为同时解决锂硫电池中的穿梭效应和锂枝晶问题提供理论支持和技术指导。

The shuttle effect of lithium sulfide and the dendrite growth of lithium anode are the key problems in lithium sulfur batteries. As a key component of the battery to isolate the cathode and anode, the separator is also a necessary place for ions to pass through, providing an opportunity to solve the two problems at the same time. In this project, MOFs-based Janus separator is designed and applied to lithium-sulfur battery. (1) The abundant and orderly channels of MOFs, the adjustable chemical environment and the coordination of anions in the electrolyte are used to induce uniform and rapid conduction of lithium ions in MOFs, so as to achieve efficient inhibition of lithium dendrite and high lithium ion conductivity.（2）Polymetallic carbides or polymetallic monatomic catalysts derived from mixed metal MOFs with both lipophilic and sulfuric properties were used as coating materials to catalyze lithium polysulfide efficiently. And explore the influence of the synergistic effect of metal types on its catalytic effect. (3) The final light Janus separator which are optimization and integration of (1) and (2) two kinds of MOFs materials, will have the multifunction of high efficient inhibition of lithium dendrite growth, high lithium ion conductivity, efficient inhibition of shuttle effect, speed up the reaction kinetics, which will result to the high performance of lithium sulfur battery. This project will provide theoretical support and technical guidance for solving the shuttle effect and lithium dendrite problem in lithium sulfur battery simultaneously.