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首页> 外文期刊>RSC Advances >LaF3-coated Li[Li0.2Mn0.56Ni0.16Co0.08]O-2 as cathode material with improved electrochemical performance for lithium ion batteries
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LaF3-coated Li[Li0.2Mn0.56Ni0.16Co0.08]O-2 as cathode material with improved electrochemical performance for lithium ion batteries

机译：LaF3包覆的Li [Li0.2Mn0.56Ni0.16Co0.08] O-2作为正极材料，具有改善的锂离子电池电化学性能

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摘要

In this article, the pristine Li-rich layered oxide Li[Li0.2Mn0.56Ni0.16Co0.08]O-2 porous microspheres have been successfully synthesized using a urea combustion method and then coated with 1 wt% LaF3 via a facile chemical precipitation route. The structures and morphologies of both pristine and LaF3 coated Li1.2Mn0.54Ni0.16Co0.08O2 were investigated by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy (HR-TEM). The results reveal that the obtained particles possesses the morphology of porous microspheres and a LaF3 layer with a thickness of 5-8 nm coated on the surface of the Li[Li0.2Mn0.56Ni0.16Co0.08]O-2 particles. As lithium ion battery cathodes, the LaF3 coated sample, compared with the pristine one, has shown a significantly improved electrochemical performance; the initial coulombic efficiency improves from 75.36% to 80.01% and the rate compatibility increased from 57.4 mA h g(-1) to an extremely high capacity of 153.5 mA h g(-1) at 5 C. Decreased electrochemical impedance spectroscopy (EIS) reveals that the enhanced electrochemical performance of the surface coating was attributed to the lower charge transfer resistance of the sample.
机译：在本文中，使用尿素燃烧方法成功地合成了原始的富锂层状氧化物Li [Li0.2Mn0.56Ni0.16Co0.08] O-2多孔微球，然后通过简便的化学沉淀法将其涂覆了1 wt％的LaF3。路线。通过X射线衍射（XRD），场发射扫描电子显微镜（FESEM）和高分辨率透射电子显微镜（HR-TEM）研究了原始和LaF3包覆的Li1.2Mn0.54Ni0.16Co0.08O2的结构和形态。 。结果表明，所获得的颗粒具有多孔微球的形态，并且在Li [Li0.2Mn0.56Ni0.16Co0.08] O-2颗粒的表面上涂覆了厚度为5-8nm的LaF3层。作为锂离子电池的阴极，与原始的LaF3涂层样品相比，其电化学性能得到了显着改善。初始库仑效率从75.36％提高到80.01％，速率相容性从57.4 mA hg（-1）增加到在5 C时具有153.5 mA hg（-1）的极高容量。电化学阻抗谱（EIS）的降低表明表面涂层增强的电化学性能归因于样品较低的电荷转移阻力。

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