کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6602981 | 1424084 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhanced electrochemical performance of Li-rich cathode Li1.2Ni0.2Mn0.6O2 by surface modification with WO3 for lithium ion batteries
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
WO3-coated Li1.2Ni0.2Mn0.6O2 cathode materials have been synthesized by using co-precipitation method along with a liquid-evaporation coating process. Investigations via X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) reveal that a WO3 layer is uniformly distributed on the surface of bulk Li1.2Ni0.2Mn0.6O2. After coating appropriate amount of WO3, the Li-rich cathode materials exhibit improved electrochemical performance. In particular, the 2â¯wt% WO3 coated sample (WO3-0.02 LLNMO) can deliver an initial discharge capacity of 252.2â¯mAâ¯hâ¯g-1 with a low irreversible capacity loss of 44.6â¯mAâ¯hâ¯g-1 and remarkable cycling stability of 97% capacity retention after 100 cycles at a current density of 52â¯mAâ¯gâ1. This is mainly due to the effects of the WO3 coating layer which can suppress the initial activation of Li2MnO3 and improve the stability of surface structure of Li-rich materials by protecting it from corrosion by HF and other side reactions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 273, 20 May 2018, Pages 88-97
Journal: Electrochimica Acta - Volume 273, 20 May 2018, Pages 88-97
نویسندگان
Kunchang Mu, Yanbing Cao, Guorong Hu, Ke Du, Hao Yang, Zhanggen Gan, Zhongdong Peng,