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首页> 外文期刊>RSC Advances >LaPO4-coated Li1.2Mn0.56Ni0.16Co0.08O2 as a cathode material with enhanced coulombic efficiency and rate capability for lithium ion batteries
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LaPO4-coated Li1.2Mn0.56Ni0.16Co0.08O2 as a cathode material with enhanced coulombic efficiency and rate capability for lithium ion batteries

机译：LAPO4涂层LI1.2MN0.56NI0.16CO0.08O2作为阴极材料，具有增强的库仑效率和锂离子电池的速率能力

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摘要

In this paper, pristine Li-rich layered oxide Li[Li0.2Mn0.56Ni0.16Co0.08]O-2 porous microspheres have been successfully synthesized by a urea combustion method, and then coated with 1.0%, 2.0%, and 3.0 wt% LaPO4 via a facile chemical precipitation route. The structures and morphologies of both pristine and LaPO4 coated Li1.2Mn0.54Ni0.16Co0.08O2 were investigated by X-ray diffractometry (XRD), field-emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy (HR-TEM). XPS data and FESEM demonstrate that the LaPO4 was successfully coated on the surface of the Li [Li0.2Mn0.56Ni0.16Co0.08]O-2 porous microspheres. Especially, the 2 wt% LaPO4 coated-Li [Li0.2Mn0.56Ni0.16Co0.08]O-2 demonstrates the best electrochemical performance. As lithium ion battery cathodes, the 2 wt% LaPO4 coated sample, compared with the pristine one, has shown significantly improved electrochemical performances: the initial coulumbic efficiency improves from 78.81% to 84.76% at 0.1C and the rate compatibility increased from 70 mA h g(-1) to a high capacity of 112.73 mA h g(-1) at a current density of 5C. The analysis of dQdV plots and electrochemical impedance spectroscopy (EIS) demonstrate that the enhanced electrochemical performance is mainly attributed to the fact that the LaPO4 coating layer can not only stabilize the cathode structure by reducing the loss of oxygen, but also protect the Li-rich cathodes by decreasing the side reactions of Li[Li0.2Mn0.56Ni0.16Co0.08]O-2 with the electrolyte and lower the charge transfer resistance of the sample.
机译：本文通过尿素燃烧方法成功地合成了原始锂富含层状氧化物Li [Li0.2Mn0.56Ni0.16CO0.08] O-2多孔微球，然后涂覆1.0％，2.0％和3.0重量通过容易化学沉淀途径％LAPO4。通过X射线衍射（XRD），现场 - 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LAPO4涂覆的Li1.2Mn0.54Ni0.16CO0.08O2的结构和形态。 。 XPS数据和FeSEM表明LAPO4成功地涂覆在Li [Li0.2Mn0.56Ni0.16CO0.080.08] O-2多孔微球的表面上。特别是，2wt％lapo4涂布Li [Li0.2Mn0.56Ni0.16CO0.08] O-2表现出最佳的电化学性能。作为锂离子电池阴极，与原始一体相比，2wt％Lapo4涂覆样品显示出显着改善的电化学性能：初始的库l效率从0.1℃的78.81％提高到84.76％，并且速率相容增加了70 ma hg （-1）电流密度为5℃的112.73 mA Hg（-1）的高容量。 DQDV图和电化学阻抗光谱（EIS）的分析表明，增强的电化学性能主要归因于LAPO4涂层不能通过降低氧气损失来稳定阴极结构，但也保护锂富有的涂层通过用电解质降低Li [Li0.2Mn0.56Ni0.16CO0.080.080.080.08] O-2的侧反应并降低样品的电荷转移电阻。

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  • 来源
    《RSC Advances》 |2015年第94期|共8页
  • 作者

    Xie Qingliang; Zhao Chenhao; Hu Zhibiao; Huang Qi; Chen Cheng; Liu Kaiyu;

  • 作者单位

    Cent S Univ Coll Chem &

    Chem Engn Changsha 410083 Hunan Peoples R China;

    LongYan Univ Coll Chem &

    Mat Sci Longyan 364012 Fujian Peoples R China;

    LongYan Univ Coll Chem &

    Mat Sci Longyan 364012 Fujian Peoples R China;

    Cent S Univ Coll Chem &

    Chem Engn Changsha 410083 Hunan Peoples R China;

    Cent S Univ Coll Chem &

    Chem Engn Changsha 410083 Hunan Peoples R China;

    Cent S Univ Coll Chem &

    Chem Engn Changsha 410083 Hunan Peoples R China;

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