کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4767575 | 1424133 | 2017 | 25 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Three-dimensional graphene hollow spheres with high sulfur loading for high-performance lithium-sulfur batteries
ترجمه فارسی عنوان
کروی های توخالی گرافن سه بعدی با بارگیری بالای گوگرد برای باتری های لیتیوم-سولفور با کارایی بالا
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
باتری لیتیم گوگرد، گرافین، حوزه های توخالی، محتوای گوگرد بالا،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
Lithium-sulfur batteries have currently attracted wide interest due to their high theoretical capacity, but the practical applications are being hampered by capacity decay, mainly attributed to the polysulfide shuttle. Here, we have designed a novel three-dimensional (3D) nanostructure of graphene hollow spheres (HGs) as the sulfur host. The 3D HGs were successfully prepared via a self-assembly method of wrapping graphene oxide (GO) on SiO2 spheres, and then followed by carbonization and etching of the SiO2. The impregnation of sulfur into the hollow graphene spheres lead to obtaining the HGs/S cathode, which reaches up a high sulfur loading of 90 wt% in the composite (72 wt % in the whole cathode). The HGs/S cathode material remains a high discharge capacity of 810 mAh gâ1 after 200 cycles at 0.5C rate. Furthermore, it demonstrates a low capacity-decay rate of 0.083% per cycle after 600 cycles at 1C rate. Compared with pristine reduced graphene oxide/sulfur composites (RGO/S), the as-prepared 3D self-assembled graphene hollow spheres HGs/S exhibit significantly improved electrochemical performances in terms of high specific capacity, remarkable rate capability and excellent cycling stability. These synergistic effects are achieved by more effective 3D ion/electron transport pathways, and efficient confinement of polysulfide dissolution and shuttling.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 224, 10 January 2017, Pages 527-533
Journal: Electrochimica Acta - Volume 224, 10 January 2017, Pages 527-533
نویسندگان
Zhen Wu, Wei Wang, Yanting Wang, Chen Chen, Kelun Li, Gangjin Zhao, Chunyu Sun, Wenjian Chen, Lubin Ni, Guowang Diao,