Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6603545 | Electrochimica Acta | 2018 | 25 Pages |
Abstract
S-doped mesoporous graphene microspheres (SMGMs) derived from the chemical vapor deposition process, are employed as reservoir materials for LiS batteries. A steam-impregnation process is applied to fabricate a S@SMGMs composite with homogeneous distribution of sublimed S in the graphene matrix. The S@SMGMs cathode prepared by the steam-impregnation process exhibits higher capacity (830â¯mAh gâ1 at 8â¯C) and better rate capability as compared to the cathode obtained from the conventional melt-diffusion process. Good structural integrity of the S@SMGMs composite is well kept after cycling. The outstanding electrochemical properties of the S@SMGMs composite cathode are mainly benefited from the perfect compounding-state between graphene and S, the unique microarchitecture decorated with highly stable porous structure and S doping. Additionally, the contribution of S doping to constraining Li-polysulfides is further confirmed by density functional theory calculations, which indicates that the binding energies between Li-polysulfides and oxided S are higher than that of thiophene-S.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Xinlong Ma, Guoqing Ning, Ying Wang, Xinyu Song, Zhihua Xiao, Liqiang Hou, Wang Yang, Jinsen Gao, Yongfeng Li,