کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7850378 | 1508848 | 2016 | 21 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Graphene/activated carbon composite material for oxygen electrodes in lithium-oxygen rechargeable batteries
ترجمه فارسی عنوان
مواد کامپوزیت کربن گرافن / فعال برای الکترود های اکسیژن در باتری های قابل شارژ لیتیوم اکسیژن
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی (عمومی)
چکیده انگلیسی
To reduce the charge overpotential and improve the cyclability of Lithium-Oxygen (Li-O2) batteries, a novel carbon composite material consisting of graphene and activated carbon (G/AC) is developed for the oxygen electrode (cathode). In the G/AC, the graphene forms a three-dimensional (3D) network with good electrical conductivity and excellent mechanical strength and flexibility, while the AC layer on the graphene surface provides numerous meso/micropores with diameters of less than several nanometers that act as active sites (or nucleation sites) for the discharge reaction. The particle size of the discharge product Li2O2 becomes much smaller (â¼10Â nm), and the particles are distributed more homogeneously in the G/AC cathode, whereas toroidal particles as large as 100-200Â nm occur in the pristine graphene cathode. The charge voltage for the G/AC cathode gradually increases from â¼3Â V to 4Â V, while the voltage for the graphene cathode shows a steep increase to a plateau at 4.2-4.3Â V and eventually exceeds 4.5Â V. The G/AC cathode also exhibits much better cyclability than the graphene. These observations indicate that the refinement of the Li2O2 particles achieved by increasing the number of nucleation sites effectively lowers the charge overpotential and improves the cyclability of the Li-O2 batteries.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbon - Volume 99, April 2016, Pages 167-173
Journal: Carbon - Volume 99, April 2016, Pages 167-173
نویسندگان
Xing Xin, Kimihiko Ito, Yoshimi Kubo,