کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7725816 | 1497854 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Mesostructured niobium-doped titanium oxide-carbon (Nb-TiO2-C) composite as an anode for high-performance lithium-ion batteries
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Mesostructured niobium (Nb)-doped TiO2-carbon (Nb-TiO2-C) composites are synthesized by a hydrothermal process for application as anode materials in Li-ion batteries. The composites have a hierarchical porous structure with the Nb-TiO2 nanoparticles homogenously distributed throughout the porous carbon matrix. The Nb content is controlled (0-10â¯wt%) to investigate its effect on the physico-chemical properties and electrochemical performance of the composite. While the crystalline/surface structure varied with the addition of Nb (d-spacing of TiO2: 0.34-0.36â¯nm), the morphology of the composite remained unaffected. The electrochemical performance (cycle stability and rate capability) of the Nb-TiO2-C composite anode with 1â¯wt% Nb doping improved significantly. First, a full cut-off potential (0-2.5â¯V vs. Li/Li+) of Nb-doped composite anode (1â¯wt%) provides a higher energy utilization than that of the un-doped TiO2-C anode. Second, Nb-TiO2-C composite anode (1â¯wt%) exhibits an excellent long-term cycle stability (100% capacity retention, 297â¯mAh/g at 0.5â¯C after 100 cycles and 221â¯mAh/g at 2â¯C after 500 cycles) and improved rate-capability (192â¯mAh/g at 5â¯C), respectively (1â¯C: 150â¯mA/g). The superior electrochemical performance of Nb-TiO2-C (1â¯wt%) could be attributed to the synergistic effect of improved electronic conductivity induced by optimal Nb doping (1â¯wt%) and lithium-ion penetration (high diffusion kinetics) through unique pore structures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 378, 28 February 2018, Pages 225-234
Journal: Journal of Power Sources - Volume 378, 28 February 2018, Pages 225-234
نویسندگان
Keebum Hwang, Hiesang Sohn, Songhun Yoon,