کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6602218 | 1424075 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhanced performance and anchoring polysulfide mechanism of carbon aerogel/sulfur material with Cr doping and pore tuning for Li-S batteries
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
The ultrafine Cr2O3 modified carbon aerogel (Cr-CA) composites were successfully synthesized through in situ and sol-gel method as cathode material for lithium sulfur battery. The chromium doping remarkably controls structure, decreases carbon sphere size and promotes network interconnect. The nano Cr-CA composites with large pore volume and high specific surface present stronger adsorption ability and effectively immobilize polysulfides. The Cr-CA/S composite cathodes display excellent electrochemical performance with high specific capacity and long cycling stability. Especially, the Cr2-CA/S cathode with 65.9â¯wt% of sulfur delivers initial specific capacity of 1343 and 987â¯mAh gâ1 at the rate of 0.2â¯C and 2â¯C, respectively. It exhibits the outstanding long-term cyclic stability with the discharge capacity of 873â¯mAh gâ1â¯at 0.5â¯C for the 300th cycle. The excellent performance is mainly attributed to special anchoring role of Cr2O3 to polysulfides and its catalytic effect for redox reaction process. Furthermore, the adsorb energy between polysulfides and Cr2O3 and theoretic analysis by DFT definitely reveals and supports immobilizing and catalytic mechanism.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 282, 20 August 2018, Pages 499-509
Journal: Electrochimica Acta - Volume 282, 20 August 2018, Pages 499-509
نویسندگان
Pei Zhang, Xueliang Li, Yang Hua, Jingjian Yu, Yunsheng Ding,