储能科学与技术2019，Vol.8Issue(3)：523-531,9.DOI:10.12028/j.issn.2095-4239.2019.0007
层层自组装MoS2多晶片增强锂硫电池性能
Edge-rich MoS2 nanosheets for high performance self-supporting Li-S batteries
摘要
Abstract
Despite the high theoretical energy density and specific capacity, the practical application of Li-S battery is still impeded because of the low electrical conductivity of sulfur and the dissolution of lithium polysulfides in electrolyte. Edge sites of 2D layered transition metal dichalcogenides have been show advantages than in-plane sites on preventing the shuttling effects of polysulfides. While the synthesis of 3D hierarchical MoS2 structures with abundant active edge sites is still a challenge. Herein, vertically aligned MoS2 nanosheets with richly exposed (002) plane edges on the carbon cloth were fabricated via hydrothermal process and served as the host of sulfur to improve its electrochemical performance. Besides the carbon cloth as ideal supporting material to facilitate electron/ion transport, edge-rich layered MoS2 nanosheets with abundant dangling Mo-S bonds can localized the size of sulfur particles to 510 nm, which results a high utilization of active substances (～1174 mA?h?g–1 at 0.1 C) and improve the reversibility and polysulfide redox kinetics. Furthermore, the edge sites have strong rules to absorb and catalyze the conversion of polysulfides. Therefore, the self-supporting cathode can deliver a specific discharge capacity (based on sulfur) of 857 mA?h?g–1 at 1 C after 400 cycles and 579 mA?h?g–1 at 2 C after 800 cycles.关键词
锂硫电池/边缘位点/催化转化/自支撑Key words
lithium-sulfur battery/edge sites/catalytic conversion/self-supporting分类
信息技术与安全科学引用本文复制引用
姚琳,周玲,李世雄,李晓敏,何凯,何青泉,宰建陶,任奇志,钱雪峰..层层自组装MoS2多晶片增强锂硫电池性能[J].储能科学与技术,2019,8(3):523-531,9.基金项目
National Natural Science Foundation of China(21771124,21673273 and 21371120) （21771124,21673273 and 21371120）
National Basic Research Program of China(2014CB239702) （2014CB239702）
Science and Technology Commission of Shanghai Municipality(17ZR1441200,18230743400) （17ZR1441200,18230743400）
Shanghai Rising-Star Program(18QA1402400) （18QA1402400）
Scientific Innovation Talent of Henan Province(174200510017) （174200510017）
China Postdoctoral Science Foundation(2017M611529 and 2017M621445) （2017M611529 and 2017M621445）
