Preparation and Application of Manganese Dioxide/Graphene Composite in Lithium Sulfur Batteries
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2020年第1期
论文作者：郭维敏 ZHU Qinglin LI Xiaoman 卢清华
文章页码：1 - 8
摘 要：Graphene/manganese dioxide composites and grapheme/manganese dioxide/sulfur（G/MnO2/S） composite cathode were prepared by hydrothermal method and by vapor permeation, respectively. Their structure, morphology and specific surface area were characterized by X-ray diffraction, electron microanalysis and nitrogen adsorption analysis. The composites show morphology of nanosheets, high specific surface area and even distribution of sulfur. The sulfur accounts for 75% in the G/Mn O2/S composite by thermogravimetric analysis. The electrochemical performance of G/S and G/Mn O2/S cathode were investigated. The G/Mn O2/S composite cathodes show excellent rate performance and cycle stability. At a 0.2 C current density, initial discharge specific capacity is 1 061 m A·h·g-1 and maintains 698 m A·h·g-1 after 100 cycles; At a 1 C current density, maximum discharge capacity reaches 816 m A·h·g-1 and average capacity decreasing rate is only 0.073%/cycle after running over 400 cycles. Electrochemical mechanism of the composites cathodes was analyzed. The sulfur adsorption of Mn O2 inhibited the loss of active material sulfur, so, the electrochemical performance of the complex was improved.
郭维敏，ZHU Qinglin，LI Xiaoman，卢清华
School of Minerals Processing and Bioengineering, Central South University
摘 要：Graphene/manganese dioxide composites and grapheme/manganese dioxide/sulfur（G/MnO2/S） composite cathode were prepared by hydrothermal method and by vapor permeation, respectively. Their structure, morphology and specific surface area were characterized by X-ray diffraction, electron microanalysis and nitrogen adsorption analysis. The composites show morphology of nanosheets, high specific surface area and even distribution of sulfur. The sulfur accounts for 75% in the G/Mn O2/S composite by thermogravimetric analysis. The electrochemical performance of G/S and G/Mn O2/S cathode were investigated. The G/Mn O2/S composite cathodes show excellent rate performance and cycle stability. At a 0.2 C current density, initial discharge specific capacity is 1 061 m A·h·g-1 and maintains 698 m A·h·g-1 after 100 cycles; At a 1 C current density, maximum discharge capacity reaches 816 m A·h·g-1 and average capacity decreasing rate is only 0.073%/cycle after running over 400 cycles. Electrochemical mechanism of the composites cathodes was analyzed. The sulfur adsorption of Mn O2 inhibited the loss of active material sulfur, so, the electrochemical performance of the complex was improved.
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