X射线光电子能谱
材料科学
扫描电子显微镜
锂(药物)
阴极
分析化学(期刊)
电化学
透射电子显微镜
锂离子电池
化学工程
电池(电)
复合材料
化学
纳米技术
电极
色谱法
物理
工程类
内分泌学
医学
物理化学
功率(物理)
量子力学
作者
Hengqing Tong,Pengyuan Dong,Jiafeng Zhang,Junchao Zheng,Wanjing Yu,Kai Wei,Zhenan Bao,Zhimin Liu,Dewei Chu
标识
DOI:10.1016/j.jallcom.2018.06.020
摘要
In order to enhance the electrochemical properties of nickel-rich LiNi0.8Co0.1Mn0.1O2 cathode material, lithium-ion conductor shell was coated on the surface of the material through a facile wet chemical route. The morphologies, structures and chemical compositions of the samples were characterized by scanning electron microscope, transmission electron microscope, X-ray diffraction, energy dispersive spectrometer and X-ray photoelectron spectroscopy. The result shows that the particle surface was uniformly coated by a very thin LaPO4 layer. Electrochemical measurements proved that the LaPO4-coated sample exhibited excellent cycling performance. The capacity retention of LaPO4-coated sample was 91.2% at 1 C after 100 cycles, which was higher compared with that of the pristine sample (76.4%). Moreover, the rate performance of the coated sample was greatly enhanced especially at 2, 5 and 10 C rate. The LaPO4-coated sample showed smaller charge transfer resistance and higher diffusion coefficient of lithium ions compared with those of the pristine sample.
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