MoS_(2)量子点修饰ZIF-67复合材料的制备及其在锂硫电池中的应用  

Preparation of MoS_(2)QDs Modified ZIF-67 Composite Materials and Their Application in Lithium-Sulfur Batteries

作　　者：卫萌 逯含情 王震 赵新[1] 周秋霜 徐松 WEI Meng;LU Hanqing;WANG Zhen;ZHAO Xin;ZHOU Qiushuang;XU Song(Zhengzhou University of Aeronautics,Zhengzhou 450046,China;Collaborative Innovation Center of Aviation Economy Development,Zhengzhou 450046,China)

机构地区：[1]郑州航空工业管理学院材料学院,河南郑州450046 [2]航空经济发展河南省协同创新中心,河南郑州450046

出　　处：《郑州航空工业管理学院学报》2025年第1期73-81,共9页Journal of Zhengzhou University of Aeronautics

基　　金：河南省科技发展计划项目(232102241002);航空科学基金(2022Z040055001);河南省自然科学基金(222300420576);河南省科技攻关项目(242102240087);河南省高等学校重点科研项目(23B140004);郑州航空工业管理学院研究生教育创新计划基金(2023CX77)。

摘　　要：锂硫(Li-S)电池因其具有超高的理论比容量(1675 mAh/g)和比能量(2600 Wh/kg)、储量丰富、成本低廉和环境友好等优势成为最具前景的下一代储能器件。但是由于正极存在的一些问题,像活性物质硫导电率低、反应过程中体积膨胀和多硫化物穿梭效应等,严重阻碍了其商业化应用。以金属—有机框架(ZIF-67)作为Li-S电池的多功能载体,以二硫化钼量子点(MoS_(2)QDs)为活性催化位点,金属化合物Ni(OH)_(2)作为物理防护层,构筑并制备MoS_(2)QDs-ZIF-67/S@NH复合材料,验证其对多硫化物(LiPS)的吸附和催化作用。获得的正极材料结合了极性ZIF-67和MoS_(2)QDs的优势,能够通过极性作用锚定多硫化物,还可以为氧化还原转化提供大量催化位点,Ni(OH)_(2)包覆层实现了对活性材料的物理限域,还为多硫化物的氧化还原过程提供快速电子/离子传输的有效途径。电化学测试表明MoS_(2)QDs-ZIF-67/S@NH复合材料具有优异的电化学性能,在0.5 C倍率下初始比容量为1147.6 mAh/g,循环350圈后,比容量为768.8 mAh/g,容量保留率为65.5%,每圈容量衰减为0.09%,库伦效率始终维持在94%以上。Lithium-sulfur(Li-S)batteries had become one of the most promising next-generation energy storage devices due to their ultra-high theoretical specific capacity(1675 mAh/g)and specific energy(2600 Wh/kg),abundant reserves,low cost,and environmental friendliness.However,some problems in the cathode,such as the low conductivity of the active sulfur,the volume expansion during the reaction and the shuttle effect of polysulfides,significantly hindered their commercial applications.In this paper,MoS_(2)QDs-ZIF-67/S@NH compo-sites were constructed and prepared by using a metal-organic framework(ZIF-67)as a multifunctional carrier for Li-S batteries,molybdenum disulfide quantum dots(MoS_(2)QDs)as the active catalytic site,and metal compound Ni(OH)_(2) as the physical protective layer.Its adsorption and catalytic effects on polysulfides(LiPS)were also examined and verified.The obtained cathode material combined the advantages of polar ZIF-67 and MoS_(2)QDs,which could anchor polysulfides through polar action and provide a large number of catalytic sites for redox conversion.Additionally,the Ni(OH)_(2) coating realized the physical confinement of the active material,and offered an effective way for rapid electron/ion transport during the redox processes of polysulfides.Electrochemical tests showed that MoS_(2)QDs-ZIF-67/S@NH composites had excellent electrochemical properties.At a 0.5 C rate,they delivered an initial specific capacity of 1147.6 mAh/g,but after 350 cycles,the specific capacity attained 768.8 mAh/g.They had a capacity retention rate of 65.5%and a capacity attenuation rate of 0.09%per cycle,which maintaining a Coulombic efficiency of more than 94%.

关 键 词：二硫化钼量子点 金属—有机骨架 氢氧化镍 穿梭效应 锂硫电池 

分 类 号：TM912[电气工程—电力电子与电力传动] TB332[一般工业技术—材料科学与工程]