کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
191354 459720 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Niobium doped lithium titanate as a high rate anode material for Li-ion batteries
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Niobium doped lithium titanate as a high rate anode material for Li-ion batteries
چکیده انگلیسی

Niobium doped lithium titanate with the composition of Li4Ti4.95Nb0.05O12 has been prepared by a sol–gel method. X-ray diffraction (XRD) and scanning electron microscope (SEM) are employed to characterize the structure and morphology of Li4Ti4.95Nb0.05O12. The Li4Ti4.95Nb0.05O12 electrode presents a higher specific capacity and better cycling performance than the Li4Ti5O12 electrode prepared by the similar process. The Li4Ti4.95Nb0.05O12 exhibits an excellent rate capability with a reversible capacity of 135 mAh g−1 at 10 C, 127 mAh g−1 at 20 C and even 80 mAh g−1 at 40 C. Electrical resistance measurement and electrochemical impedance spectra (EIS) reveal that the Li4Ti4.95Nb0.05O12 exhibits a higher electronic conductivity and faster lithium-ion diffusivity than the Li4Ti5O12, which indicates that niobium doped lithium titanate (Li4Ti4.95Nb0.05O12) is promising as a high rate anode for the lithium-ion batteries.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 55, Issue 19, 30 July 2010, Pages 5453–5458
نویسندگان
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