Preparation and Application of Manganese Dioxide/Graphene Composite in Lithium Sulfur Batteries

作     者：郭维敏 ZHU Qinglin LI Xiaoman 卢清华 GUO Weimin;ZHU Qinglin;LI Xiaoman;LU Qinghua

作者机构：School of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083China 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2020年第35卷第1期

页      面：1-8页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：Supported by the Graduate Freedom Exploration Project Fund of the Central South University(No.502211850) 

主　　题：manganese dioxide grapheme electrochemical performance lithium-sulfur batteries 

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/MnO2/S composite by thermogravimetric analysis. The electrochemical performance of G/S and G/MnO2/S cathode were investigated. The G/MnO2/S composite cathodes show excellent rate performance and cycle stability. At a 0.2C 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 1C 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.