کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1516914 | 1511600 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preparation, characterization and electrochemical property of Sn-Fe-Mo-Al2O3 multi-phase composites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
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چکیده انگلیسی
A novel technique has been developed to synthesize Sn-Fe-Mo-Al2O3, while nanoscale dispersion of a highly active tin phase was finely distributed in a stable inert multi-phase. The precursor was prepared by co-precipitation method with SnCl4, FeCl3, AlCl3 and (NH4)6Mo7O24 as the raw materials. Sn-Fe-Mo-Al2O3 mixture was produced by reducing the precursor with H2. The product was characterized by X-ray diffraction (XRD), ICP and scanning electron microscopy (SEM). The performance of the electrode was investigated. The Sn-Fe-Mo-Al2O3 electrode was found to have an initial charge capacity of over 461 mAh/g, and a reversible volumetric capacity of 2090 mAh/cm3, which is two times larger than that of graphite electrode (800 mAh/cm3). The coulomb efficiency in the first cycle was over 55%, but its cyclability was not improved significantly. In order to enhance the cycle performance, we investigated the anode after heat treated at 270 °C for 12 h. Under the same condition, the first charge-discharge characteristics were almost equivalent to the as-coated anode, and the retention capacity ratio after 20 cycles was improved from 41.1% to 86.5%. The heat-treated Sn-Fe-Mo-Al2O3 electrode exhibited better cycle life. The electrochemical reaction of the Sn-Fe-Mo-Al2O3 electrode with Li may obey the alloying-dealloying mechanism of LixSn(x⩽4.4) formation in the other tin-based electrodes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Physics and Chemistry of Solids - Volume 70, Issue 1, January 2009, Pages 79-83
Journal: Journal of Physics and Chemistry of Solids - Volume 70, Issue 1, January 2009, Pages 79-83
نویسندگان
Y. Liang, Z.G. Tian, Y. Liu, Y.S. Luo,