کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8000211 | 1516272 | 2015 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Mg doping and zirconium oxyfluoride coating co-modification to enhance the high-voltage performance of LiCoO2 for lithium ion battery
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Mg doping and zirconium oxyfluoride (ZrOxFy) coating are introduced simultaneously to improve the high-voltage performance of LiCoO2 cathode material. XRD, TEM and XPS analysis confirm that the doping element (Mg) is incorporated into the lattices of the modified samples and there is a compact ZrOxFy coating layer on the surface of the co-modified sample. In addition, DSC results indicate that the modified samples show better thermal stability at the charged state. Electrochemical tests demonstrate that the cycling capability of co-modified sample is enhanced apparently, which maintains 76.3% of its initial capacity after 100Â cycles at 1Â C in the voltage range of 3.0-4.6Â V. That is much more than 19.5% for the pristine sample. Moreover, EIS, XRD, TEM and Co dissolution tests of the cycled electrodes reveal that Mg-doping stabilizes the crystal structure of LiCoO2 and ZrOxFy-coating alleviates unwanted interfacial side reactions between the cathode and electrolyte, thereby suppressing Co dissolution and the impedance growth during prolonged cycling.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 621, 5 February 2015, Pages 212-219
Journal: Journal of Alloys and Compounds - Volume 621, 5 February 2015, Pages 212-219
نویسندگان
Zhiguo Wang, Zhixing Wang, Huajun Guo, Wenjie Peng, Xinhai Li, Guochun Yan, Jiexi Wang,