title: A MnO2/Graphene Oxide/Multi-Walled Carbon Nanotubes-Sulfur Composite with Dual-Efficient Polysulfide Adsorption for Improving Lithium-Sulfur Batteries.
abstract: Lithium-sulfur batteries can potentially be used as a chemical power source because of their high energy density. However, the sulfur cathode has several shortcomings, including fast capacity attenuation, poor electrochemical activity, and low Coulombic efficiency. Herein, multi-walled carbon nanotubes (CNTs), graphene oxide (GO), and manganese dioxide are introduced to the sulfur cathode. A MnO2/GO/CNTs-S composite with a unique three-dimensional (3D) architecture was synthesized by a one-pot chemical method and heat treatment approach. In this structure, the innermost CNTs work as a conducting additive and backbone to form a conducting network. The MnO2/GO nanosheets anchored on the sidewalls of CNTs have a dual-efficient absorption capability for polysulfide intermediates as well as afford adequate space for sulfur loading. The outmost nanosized sulfur particles are well-distributed on the surface of the MnO2/GO nanosheets and provide a short transmission path for Li+and the electrons. The sulfur content in the MnO2/GO/CNTs-S composite is as high as 80 wt %, and the as-designed MnO2/GO/CNTs-S cathode displays excellent comprehensive performance. The initial specific capacities are up to 1500, 1300, 1150, 1048, and 960 mAh g-1at discharging rates of 0.05, 0.1, 0.2, 0.5, and 1 C, respectively. Moreover, the composite cathode shows a good cycle performance: the specific capacity remains at 963.5 mAh g-1at 0.2 C after 100 cycles when the area density of sulfur is 2.8 mg cm-2.
authors.affiliation: State Key Laboratory of Space Power Technology, Shanghai Institute of Space Power Sources , Shanghai 200245, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Chemistry and Molecular Biology, University of Gothenburg S-41296, Gothenburg, Sweden.
authors.forename: Daixin
authors.initials: D
authors.lastname: Ye
authors.affiliation: State Key Laboratory of Space Power Technology, Shanghai Institute of Space Power Sources , Shanghai 200245, China.
authors.forename: Wen
authors.initials: W
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Space Power Technology, Shanghai Institute of Space Power Sources , Shanghai 200245, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Shi
authors.affiliation: State Key Laboratory of Space Power Technology, Shanghai Institute of Space Power Sources , Shanghai 200245, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Guo
authors.affiliation: Department of Chemistry, Institute of Sciences, Shanghai University , Shanghai 200444, China.
authors.forename: Hongbin
authors.initials: H
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Space Power Technology, Shanghai Institute of Space Power Sources , Shanghai 200245, China.
authors.forename: Haijuan
authors.initials: H
authors.lastname: Pei
authors.affiliation: Department of Chemistry, Institute of Sciences, Shanghai University , Shanghai 200444, China.
authors.forename: Jiaqiang
authors.initials: J
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Space Power Technology, Shanghai Institute of Space Power Sources , Shanghai 200245, China.
authors.forename: Jingying
authors.initials: J
authors.lastname: Xie
keywords: MnO2; carbon nanotube; graphene oxide; lithium sulfur; polysulfide adsorption