化工学报2016，Vol.67Issue(10)：4363-4369,7.DOI:10.11949/j.issn.0438-1157.20160584
锂硫电池石墨烯/纳米硫复合正极材料的制备及电化学性能
Preparation and electrochemical properties of graphene/nano-sulfur composite as cathode materials for lithium-sulfur batteries
摘要
Abstract
A graphene/nano-sulfur (RGO/nano-S) cathode composites was prepared by chemical precipitation of nano-sulfur onto graphene sheets, which were synthesized by pyrolyzing reduction of graphene oxide from Hummers method. The microscopic structure and morphology of the composites were characterized by FT-IR, XRD, SEM, TEM and Raman, while the electrochemical properties were studied by galvanostatic charge-discharge measurements, cyclic voltammetry and electrochemical impedance spectroscopy. The results showed that wrinkled surface on the thermally reduced graphene created a space to accommodate sulfur and polysulfur ions, which helped to hinder dissolving of active cathode materials and suppress migration of polysulfide ions. A homogeneous distribution of nano-sulfur in the graphene conductive network significantly enhanced the effective contact with electrolyte and increased electrochemical reaction area, so that improved discharge capacity and cycle-life performance of the lithium-sulfur batteries.关键词
锂硫电池/石墨烯/纳米硫/复合材料/电化学性能Key words
lithium-sulfur batteries/graphene/nano-sulfur/composites/electrochemical performance分类
数理科学引用本文复制引用
杨蓉,王黎晴,吕梦妮,邓坤发,燕映霖,任冰,李兰..锂硫电池石墨烯/纳米硫复合正极材料的制备及电化学性能[J].化工学报,2016,67(10):4363-4369,7.基金项目
国家国际科技合作专项资助项目（2015DFR50350）；陕西省教育厅自然科学专项（15JK1538）。@@@@Foundation item：supported by the International Science Technology Cooperation Program of China (2015DFR50350) and the Scientific Research Program Funded by Shaanxi Provincial Education Department (15JK1538) （2015DFR50350）
