کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7735298 | 1497959 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhanced cycle stability at high rate and excellent high rate capability of La0.7Sr0.3Mn0.7Co0.3O3-coated LiMn2O4
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
La0.7Sr0.3Mn0.7Co0.3O3-coated spinel LiMn2O4 with excellent cycle stability and high rate capability is successfully prepared by a sol-gel method. The 3 wt.% La0.7Sr0.3Mn0.7Co0.3O3-coated LiMn2O4 shows the optimum electrochemical performance. It can deliver 101 mAh gâ1 at 10 C even after 100 cycles with a capacity retention of 93.5%. In contrast, the bare LiMn2O4 delivers 83.6 mAh gâ1 at the same condition, only 84.5% capacity left. The rate capability of 3 wt.% La0.7Sr0.3Mn0.7Co0.3O3-coated LiMn2O4 is also obviously enhanced, especially at high rates (10 C, 20 C and 30 C). It can deliver 74.3 mAh gâ1 at 30 C which is much higher than that of the bare sample (47.2 mAh gâ1). The bare and coated LiMn2O4 samples are studied with various techniques. Both powder X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) measurements demonstrate the existence of the La0.7Sr0.3Mn0.7Co0.3O3, and it has no influence on the crystal structure of the pristine LiMn2O4. Transmission electron microscopy (TEM) shows that La0.7Sr0.3Mn0.7Co0.3O3 coating layer with good crystallinity can cover the surface of LiMn2O4 to form a core-shell structure. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) demonstrate that the coating layer can improve the kinetics of electrodes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 273, 1 January 2015, Pages 959-965
Journal: Journal of Power Sources - Volume 273, 1 January 2015, Pages 959-965
نویسندگان
Ting Shi, Yue Dong, Chun-Mei Wang, Fen Tao, Li Chen,