Functionalized hierarchical porous carbon with sulfur/nitrogen/oxygen tri-doped as high quality sulfur hosts for lithium-sulfur batteries
By Zhang, Hao; Zhou, Wenzheng; Huang, Dongyuan; Ou, Limin; Lan, Zhiqiang; Liang, Xianqing; Huang, Haifu; Huang, Dan; Guo, Jin
Published in Journal of Alloys and Compounds
Journal of Alloys and Compounds
2020
Abstract
A novel tri-doped hierarchical porous carbon (PC) for sulfur host is prepared by pyrolysis of a commercial gelatin and a facile template process. And, sulfur-porous carbon (S@PC) composite as cathode material of lithium sulfur battery is synthesized by a melt diffusion method. The as-prepared PC has both strongly physical adsorption and tightly chemical bonding of polysulfides due to high porosity with the interlacement of micropores, mesopores and macropores/macrohollows, large surface area, and rich heteroatom tri-doping, resulting in an excellent electrochemical performance as a sulfur host for lithium sulfur battery cathodes. Among the synthesized S@PC composites, due to the optimum melting time, S@PC 12 h composite electrode has more effective nitrogen-containing and oxygen-containing groups, and stronger S