期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 840, 期 -, 页码 144-152出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2019.03.041
关键词
Graphene; Manganese dioxide; Redox reaction; Electrical conductivity; Lithium-sulfur batteries
资金
- Graduate Freedom Exploration Project Fund of the Central South University [502211850]
Lithium-sulfur (Li-S) batteries have become a research hotspot due to their high energy density, environment friendliness and low-cost. But commercial applications are hampered by rapid capacity fading and low sulfur content. Herein, the composite of integrating manganese oxide on graphene was prepared by a facile redox reaction between potassium permanganate (KMnO4) and graphene in acidic aqueous solution to solve the problems of the Li-S batteries. X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) and transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) analysis show that sulfur was uniformity coated on G/MnO2 composite. TG indicated that the G/MnO2/S composites contained 76.56 wt% active sulfur. The prepared cathode of G/MnO2/S composites exhibited excellent rate performance and cycle stability. At a high rate of 1 C, its maximum discharge capacity reached 908 mA h g(-1) and its average capacity decreasing rate was only 0.105%/cycle when running over 500 cycles. The interaction mechanism of MnO2 with polysulfides was investigated by adsorption tests and XPS analysis. The excellent electrochemical performance might be due to a combination of adsorption or catalytic properties of MnO2, and the conductivity network of graphene.
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