کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6617053 | 459625 | 2013 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A comparative study of electrochemical performance of graphene sheets, expanded graphite and natural graphite as anode materials for lithium-ion batteries
ترجمه فارسی عنوان
بررسی مقایسه ای عملکرد الکتروشیمیایی ورق های گرافن، گرافیت گسترش یافته و گرافیت طبیعی به عنوان مواد آند برای باتری های لیتیوم یون
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کلمات کلیدی
باتری های لیتیوم یون، ورق گرافن، گرافیت گسترش یافته، گرافیت طبیعی، عملکرد چرخه،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
Three kinds of carbon materials, i.e., graphene sheets (GSs), expanded graphite (EG) and natural graphite (NG) were comparatively investigated as anode materials for lithium-ion batteries via scanning electron microscope, high-resolution transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy and a variety of electrochemical testing techniques. The test results showed that the reversible capacities of GS electrode were 1130 and 636 mA h gâ1 at the current densities of 0.2 and 1 mA cmâ2, respectively, which were almost twice those of EG electrode and three times those of NG electrode. The first-cycle coulombic efficiency and capacity retention of NG were much bigger than those of GSs and EG. The notable capacity fading observed in GSs and EG may be ascribed to the disorder-induced structure instability. The larger voltage hysteresis in GS and EG electrodes was not only related to the surface functional groups, but also to the active defects in GSs and EG, which results in greater hindrance and higher overvoltage during lithium extraction from electrode. The kinetics properties of GSs, EG and NG electrodes were compared by AC impedance measurements. GS and EG electrodes exhibited higher electrochemical activity and more favorable kinetic properties during charge and discharge process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 107, 30 September 2013, Pages 555-561
Journal: Electrochimica Acta - Volume 107, 30 September 2013, Pages 555-561
نویسندگان
Li-Zhong Bai, Dong-Lin Zhao, Tai-Ming Zhang, Wei-Gang Xie, Ji-Ming Zhang, Zeng-Min Shen,