尖晶石
X射线光电子能谱
材料科学
扫描电子显微镜
法拉第效率
涂层
拉曼光谱
复合数
阴极
透射电子显微镜
化学工程
分析化学(期刊)
电化学
复合材料
纳米技术
冶金
化学
电极
光学
色谱法
物理化学
工程类
物理
作者
Fanbo Meng,Huajun Guo,Zhixing Wang,Guochun Yan,Xinhai Li
标识
DOI:10.1016/j.jallcom.2019.03.145
摘要
The γ-WO3/Li2WO4 composite coated and spinel-embedded Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode is successfully synthesized via a simple wet coating process. A series of synthesized materials were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscope (HR-TEM), Raman and X-ray photoelectron spectroscopy (XPS). γ-WO3/Li2WO4 composite layer was successfully coated on the surface of Li-rich Mn-based materials and the spinel structure was also formed during the modification process. Charge-discharge measurements indicate that the modified samples show an enhanced cyclic properties and rate capability. After the modification process, the initial coulombic efficiency increased to 89.3% for 7 wt % W-composite coated sample with the lowest capacity loss of 33.5 mAh g−1. Particularly, 5 wt % W-composite coated sample shows the best capacity retention of 88.0% at 100 mA g−1 with the discharge capacity of 233.5 mAh g−1 and excellent rate capability with the discharge capacity of 173.0 mAh g−1 at 800 mA g−1. The improvements in electrochemical properties and structural stability were mainly due to both γ-WO3/Li2WO4 coating layer and the spinel phase formed during the modification.
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