Modulating of MoSe_(2)functional plane via doping-defect engineering strategy for the development of conductive and electrocatalytic mediators in Li-S batteries  

作　　者：Mohammed A.Al-Tahan Yutao Dong Aml E.Shrshr Xiyang Kang Hui Guan Yumiao Han Zihao Cheng Weihua Chen Jianmin Zhang 

机构地区：[1]College of Chemistry,Zhengzhou University,Zhengzhou 450001,Henan,China [2]College of Science,Henan Agricultural University,Zhengzhou 450002,Henan,China [3]Chemistry Department,Faculty of Science,Al-Azhar University,Assiut 71524,Egypt

出　　处：《Journal of Energy Chemistry》2022年第12期512-523,I0013,共13页能源化学（英文版）

基　　金：the support from the National Natural Science Foundation of China(No.21373189);the Science and Technology Department of Henan Province(No.212102210586);the Top-Notch Talents Program of Henan Agricultural University(No.30501035)。

摘　　要：The lithium polysulfide shuttle and sluggish sulfur reaction kinetics still pose significant challenges to lithium-sulfur(Li-S)batteries.The functional plane of Fe-MoSe_(2)@r GO nanohybrid with abundant defects has been designed and applied in Li-S batteries to develop the functional separator and multi-layer sulfur cathode.The cell with a functional separator exhibits a retention capacity of 462 m Ah g^(-1)after the 1000th at 0.5 C and 516 m Ah g^(-1)after the 600th at 0.3 C.Even at low electrolyte conditions(7.0μL_(mgsulfur)^(-1)and 15μL_(mgsulfur)^(-1))under high sulfur loadings(3.46 mg cm^(-2)and 3.73 mg cm^(-2)),the cell still presents high reversible discharge capacities 679 and 762 m Ah g^(-1)after 70 cycles,respectively.Further,at sulfur loadings up to 8.26 and 5.2 mg cm^(-2),the cells assembled with the bi-layers sulfur cathode and the tri-layers sulfur cathode give reversible capacities of 3.3 m Ah cm^(-2)after the 100th cycle and 3.0 m Ah cm^(-2)after the 120th cycle,respectively.This research not only demonstrates that the FeMoSe_(2)@r GO functional plane is successfully designed and applied in Li-S batteries with superior electrochemical performances but also paves the novel way for developing a unique multi-layer cathode technique to enhance and advance the electrochemical behavior of Li-S cells at a high-sulfur-loading cathode under lean electrolyte/sulfur(E/S)ratio.

关 键 词：Lithium-sulfur batteries Modified separator Fe-MoSe_(2)@rGO Multi-layers cathode Defect engineering 

分 类 号：TM912[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]