Increasing sulfur utilization in lithium-sulfur batteries by a Co-MOF-74@MWCNT interlayer  

作　　者：SiHyeon Sung Byung Hyuk Kim SeungTaek Lee Sanghyeon Choi Woo Young Yoon 

机构地区：[1]Department of Materials Science and Engineering,Korea University,1,5Ga,Anam-dong,Sungbuk-Gu,Seoul 136-701,Republic of Korea

出　　处：《Journal of Energy Chemistry》2021年第9期186-193,共8页能源化学（英文版）

基　　金：supported by grants from the National Research Foundation of Korea (NRF) and the Korean government (MSIT) (2017M3A9E2093907 and 2020R1A2C1012838)。

摘　　要：To improve lithium-sulfur battery performance,Co-MOF-74 has been applied for the first time as an interlayer with multiwalled carbon nanotubes(MWCNTs).Co-MOF-74@MWCNT was synthesized using a solvothermal method.The fabrication of Co-MOF-74@MWCNT was confirmed by scanning electron microscopy,X-ray diffraction,thermogravimetric analysis,and Brunauer-Emmett-Teller testing.The interlayer was fabricated using a filtration method.Assembled batteries were prepared using a CoMOF-74@MWCNT interlayer and an MWCNT interlayer and subsequently investigated via cyclic voltammetry tests.Co-MOF-74 promotes a redox reaction and shows a small peak at 1.85 V.A symmetric and full cell test revealed that the Co-MOF-74@MWCNT cell enables a faster redox reaction and higher capacity than that of the MWCNT cell.After 15 cycles,the Co-MOF-74@MWCNT cell achieved a value of 1112 mAh g^(-1),which is 26% greater than that of the MWCNT cell(880 mAh g^(-1)) at 0.2 C.Voltage profile testing showed that the reason for the higher capacity of the Co-MOF-74@MWCNT cell is that it promotes the conversion of Li_(2)S_(2) to Li_(2)S.Various electrochemical analyses confirmed that the Co-MOF-74@MWCNT interlayer acts not only as a physical and chemical barrier but also promotes the transformation of Li_(2)S_(2) to Li_(2)S.

关 键 词：Li-S battery Shuttling effect INTERLAYER Sulfur utilization Co-MOF-74 

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]