物理化学学报Issue(8)：1474-1480,7.DOI:10.3866/PKU.WHXB201406041
石墨烯/硫复合正极材料的一步水热法制备与电化学性能
One-Step Hydrothermal Preparation and Electrochemical Performance of Graphene/Sulfur Cathode Composites
摘要
Abstract
Reduced graphene oxide/sulfur (RGO/S) composites were synthesized by a one-step hydrothermal method using a mixture of sodium thiosulfate (Na2S2O3) and graphene oxide (GO) solution reacting under acid conditions. We explored the influence of the hydrothermal temperature, reaction time, and sulfur content on the composites. Analysis by X-ray diffraction (XRD), scanning electron microscope (SEM), and the galvanostatic charge and discharge shows that the composites have excellent cycling performance when synthesis occurs at 180 °C for 12 h to provide a carbon:sulfur mass ratio of 3:7. The first discharge capacity is delivered at 931 mAh∙g-1 and it remains at 828.16 mAh∙g-1 after 50 cycles. The coulomb efficiency of the composites is above 95%. In addition, the rate capability of these composites is much better than that of sulfur. Sulfur molecules can be evenly distributed between the graphene layers and fixed to the functional groups on the surface of graphene by this one-step hydrothermal method.关键词
锂硫电池/石墨烯/水热法/硫代硫酸钠Key words
Lithium-sulfur battery/Graphene/Hydrothermal method/Sodium thiosulfate分类
化学化工引用本文复制引用
李庆洲,李玉惠,李亚娟,刘又年..石墨烯/硫复合正极材料的一步水热法制备与电化学性能[J].物理化学学报,2014,(8):1474-1480,7.基金项目
The project was supported by the National Natural Science Foundation of China (51104184).国家自然科学基金(51104184)资助项目 （51104184）
