title: From Metal-Organic Framework to Li2S@C-Co-N Nanoporous Architecture: A High-Capacity Cathode for Lithium-Sulfur Batteries.
abstract: Owing to the high theoretical specific capacity (1166 mAh g-1), lithium sulfide (Li2S) has been considered as a promising cathode material for Li-S batteries. However, the polysulfide dissolution and low electronic conductivity of Li2S limit its further application in next-generation Li-S batteries. In this report, a nanoporous Li2S@C-Co-N cathode is synthesized by liquid infiltration-evaporation of ultrafine Li2S nanoparticles into graphitic carbon co-doped with cobalt and nitrogen (C-Co-N) derived from metal-organic frameworks. The obtained Li2S@C-Co-N architecture remarkably immobilizes Li2S within the cathode structure through physical and chemical molecular interactions. Owing to the synergistic interactions between C-Co-N and Li2S nanoparticles, the Li2S@C-Co-N composite delivers a reversible capacity of 1155.3 (99.1% of theoretical value) at the initial cycle and 929.6 mAh g-1after 300 cycles, with nearly 100% Coulombic efficiency and a capacity fading of 0.06% per cycle. It exhibits excellent rate capacities of 950.6, 898.8, and 604.1 mAh g-1at 1C, 2C, and 4C, respectively. Such a cathode structure is promising for practical applications in high-performance Li-S batteries.
authors.forename: Jiarui
authors.initials: J
authors.lastname: He
authors.forename: Yuanfu
authors.initials: Y
authors.lastname: Chen
authors.forename: Weiqiang
authors.initials: W
authors.lastname: Lv
authors.forename: Kechun
authors.initials: K
authors.lastname: Wen
authors.forename: Chen
authors.initials: C
authors.lastname: Xu
authors.forename: Wanli
authors.initials: W
authors.lastname: Zhang
authors.forename: Yanrong
authors.initials: Y
authors.lastname: Li
authors.affiliation: National Engineering Laboratory for Biomass Power Generation Equipment, School of Renewable Energy Engineering, North China Electric Power University , Beijing 102206, People's Republic of China.
authors.forename: Wu
authors.initials: W
authors.lastname: Qin
authors.affiliation: College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, People's Republic of China.
authors.forename: Weidong
authors.identifier: 0000-0001-8242-2888
authors.initials: W
authors.lastname: He
keywords: cathode; lithium sulfide; lithium−sulfur battery; metal−organic frameworks