کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6603545 | 1424088 | 2018 | 25 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
S-doped mesoporous graphene microspheres: A high performance reservoir material for LiS batteries
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 269, 10 April 2018, Pages 83-92
Journal: Electrochimica Acta - Volume 269, 10 April 2018, Pages 83-92
نویسندگان
Xinlong Ma, Guoqing Ning, Ying Wang, Xinyu Song, Zhihua Xiao, Liqiang Hou, Wang Yang, Jinsen Gao, Yongfeng Li,