کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5459169 | 1516179 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
SiO2 coated Li1.2Ni0.2Mn0.6O2 as cathode materials with rate performance, HF scavenging and thermal properties for Li-ion batteries
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
In this work, pristine Li-rich layered Li1.2Ni0.2Mn0.6O2 (LNMO) oxide microspheres are synthesized by a co-precipitation method, and amorphous SiO2 is used to modify the LNMO material via a sol-gel method. The structures and morphologies of both the pristine and SiO2 coated materials are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The result of SEM-EDS and TEM demonstrate that the SiO2 was successfully coated on the surface of the LNMO microspheres. The sample modified with optimized amount (0.5 wt %) of SiO2 presents obviously improved initial coulombic efficiency, cyclic capacity, high rate performance. It can deliver high discharge capacity of 100.0 mA h gâ1 at 10C after 50 cycles at 1C which is much higher than the pristine material. By the comparison of cyclic performance in electrolytes containing with 1000 and 2000 ppm water respectively, SiO2 coating layer shows a superior absorption of hydrofluoric acid (HF). The SiO2 coated samples also present superior thermal stability proved by cycling at 1 C and 60 °C. The analysis of electrochemical impedance spectroscopy (EIS) demonstrate that the SiO2 coating layer can protect the Li-rich cathodes by decreasing the side reactions of LNMO with the electrolyte, increasing lithium ion diffusion coefficients and lower the charge transfer resistance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 715, 25 August 2017, Pages 105-111
Journal: Journal of Alloys and Compounds - Volume 715, 25 August 2017, Pages 105-111
نویسندگان
Yujuan Zhao, Zhi Lv, Tao Xu, Jingxia Li,