Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7993850 | Journal of Alloys and Compounds | 2018 | 30 Pages |
Abstract
A kind of nitrogen-doped activated microporous carbon sphere/sulfur composite (NAMCS/S) is deliberately designed and prepared via a controllable solvothermal method and a liquid phase in-situ sulfur deposition technology. The structure characteristic and composition analysis of samples are conducted with X-ray photoelectron spectroscopy (XPS), elemental analysis (EA), field-emission scanning electron microscopy (FESEM) and high resolution transmission electron microscope (HRTEM). The electrochemical performances are characterized by galvanostatic charge-discharge (GCD), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements. The results show that the nitrogen-doped activated microporous carbon spheres (NAMCS) present uniform spherical morphology, abundant nitrogen content of 9.64Â wt%, and large specific surface areas of 1578.6Â m2/g. Compared with the activated microporous carbon sphere/sulfur (AMCS/S) composite, the NAMCS/S composite with same sulfur loading of 64Â wt% can deliver a higher initial capacity of 1004.6Â mAh/g and a stable capacity retention of 79.1% after 100 cycles at 0.1Â C rate as well as a remarkable Coulombic efficiency of 93% and relative low capacity decay of 0.2% per cycle. These effective improvements are attributed to the change of surface physicochemical property, chemical interaction between nitrogen functionality and polysulfides and the physical adsorption of abundant microporous structure.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Kaixiong Xiang, Siyu Cai, Xianyou Wang, Manfang Chen, Shouxin Jiang,