کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7734802 | 1497958 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Insight into cobalt-doping in Li2FeSiO4 cathode material for lithium-ion battery
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
This study presents the preparation and electrochemical performance of cobalt-doped Li2FeSiO4/C (Co-doped LFS/C) composite by using a solid-state reaction assisted with refluxing process. The Co-doped LFS/C composite delivers a higher discharge capacity of 142.5 mAh gâ1 at 3.0 C even after 100 cycles compared with pristine LFS/C. A clear feature of cobalt-doping in Li2FeSiO4 has been specified by X-ray powder diffraction, X-ray photoelectron spectroscopy coupled with Ar-ion sputtering, X-ray absorption spectroscopy, and positron annihilation lifetime spectroscopy. It is confirmed that Co has been successfully doped into the lattice of LFS, and Co-doping does not change the monoclinic structure of LFS and the oxidation state of Fe. Positron annihilation lifetime spectroscopy analysis further demonstrates that Co-doping increases the defect concentration and the electronic conductivity of LFS. The results clarify the nature of cobalt-doping in LFS and are helpful for understanding the enhancement mechanism of the electrochemical performance of LFS and other cathode materials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 274, 15 January 2015, Pages 194-202
Journal: Journal of Power Sources - Volume 274, 15 January 2015, Pages 194-202
نویسندگان
Lu-Lu Zhang, Song Duan, Xue-Lin Yang, Gan Liang, Yun-Hui Huang, Xing-Zhong Cao, Jing Yang, Ming Li, Mark C. Croft, Cale Lewis,