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首页> 外文期刊>ACS applied materials & interfaces >Coprecipitation-Gel Synthesis and Degradation Mechanism of Octahedral Li1.2Mn0.54Ni0.13Co0.13O2 as High-Performance Cathode Materials for Lithium-Ion Batteries
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Coprecipitation-Gel Synthesis and Degradation Mechanism of Octahedral Li1.2Mn0.54Ni0.13Co0.13O2 as High-Performance Cathode Materials for Lithium-Ion Batteries

机译：八面体Li1.2Mn0.54Ni0.13Co0.13O2作为锂离子电池的高性能阴极材料的共沉淀 - 凝胶合成及降解机理

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摘要

The octahedral core shell Li-rich layered cathode material of Li1.2Mn0.54Ni0.13Co0.13O2 can be synthesized via an ingenious coprecipitation-gel method without subsequent annealing. On the basis of detailed X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and electron energy loss spectroscopy characterizations, it is suggested that the as-prepared material consists of an octahedral morphology and a new type of core-shell structure with a spinel-layered heterostructure inside, which is the result of overgrowth of the spinel structure with {111} facets on {001} facets of the layered structure in a single orientation. The surface area of Li1.2Mn0.54Ni0.13Co0.13O2 crystals where the spinel phase is located possesses sufficient Li and O vacancies, resulting in the reinsertion of Li into position after the first charge and maintenance of the interface stability via the replenishment of oxygen from the bulk region. Compared to that synthesized by the traditional coprecipitation method, the Li1.2Mn0.54Ni0.13Co0.13O2 synthesized by the coprecipitation-gel method exhibits higher discharge capacity and Coulombic efficiency, from 73.9% and 251.5 mAh g(-1) for the spherical polycrystal material to 86.2% and 291.4 mAh g(-1).
机译：可以通过巧妙的共沉淀 - 凝胶法合成Li1.2Mn0.54Ni0.13Co0.13O2的八面体核心壳锂层状阴极材料，而无需随后退火。在详细的X射线衍射，扫描电子显微镜，透射电子显微镜和电子能损光谱特征的基础上，建议制备的材料由八面体形态和新型的核心壳结构组成内部尖晶石层状异质结构，这是尖晶石结构的过度生长的结果，其中单位方向的层状结构的{001}小平面上的{111}小平面。尖晶石相位所在的Li1.2mN0.54Ni0.13Co0.13O2晶体的表面积具有足够的Li和O空位，导致Li在第一次充电和维护界面稳定性之后的位置，通过补充氧气来自散装地区。与传统的共沉淀方法合成相比，由CopRecipition-凝胶法合成的Li1.2Mn0.54Ni0.13Co0.13O2表现出较高的放电能力和库仑效率，从73.9％和251.5mAhg（-1）用于球形多晶材料至86.2％和291.4 mah g（-1）。

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  • 来源
    《ACS applied materials & interfaces》 |2018年第27期|共11页
  • 作者

    He Wenxiang; Liu Jianguo; Sun Wei; Yan Wuwei; Zhou Liang; Wu Congping; Wang Junsheng; Yu Xinhang; Zhao Haimin; Zhang Tianren; Zou Zhigang;

  • 作者单位

    Nanjing Univ Coll Engn &

    Appl Sci Natl Lab Solid State Microstruct Jiangsu Key Lab Nano Technol 22 Hankou Rd Nanjing 210093 Jiangsu Peoples R China;

    Nanjing Univ Coll Engn &

    Appl Sci Natl Lab Solid State Microstruct Jiangsu Key Lab Nano Technol 22 Hankou Rd Nanjing 210093 Jiangsu Peoples R China;

    Zhejiang Tianneng Energy Technol Co Ltd R&

    D Dept Changxing 313100 Zhejiang Peoples R China;

    Nanjing Univ Kunshan Innovat Inst Kunshan Sunlaite New Energy Co Ltd 1699 South Zuchongzhi Rd Suzhou 215347 Peoples R China;

    Nanjing Univ Kunshan Innovat Inst Kunshan Sunlaite New Energy Co Ltd 1699 South Zuchongzhi Rd Suzhou 215347 Peoples R China;

    Nanjing Univ Kunshan Innovat Inst Kunshan Sunlaite New Energy Co Ltd 1699 South Zuchongzhi Rd Suzhou 215347 Peoples R China;

    Zhejiang Tianneng Energy Technol Co Ltd R&

    D Dept Changxing 313100 Zhejiang Peoples R China;

    Zhejiang Tianneng Energy Technol Co Ltd R&

    D Dept Changxing 313100 Zhejiang Peoples R China;

    Zhejiang Tianneng Energy Technol Co Ltd R&

    D Dept Changxing 313100 Zhejiang Peoples R China;

    Zhejiang Tianneng Energy Technol Co Ltd R&

    D Dept Changxing 313100 Zhejiang Peoples R China;

    Nanjing Univ Coll Engn &

    Appl Sci Natl Lab Solid State Microstruct Jiangsu Key Lab Nano Technol 22 Hankou Rd Nanjing 210093 Jiangsu Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学工业;
  • 关键词

    Li-rich layered cathodes; Li-ion batteries; octahedral; coprecipitation-gel methods; spinel phase;

    机译：富富分层阴极;锂离子电池;八面体;CopRecipition-凝胶方法;尖晶石相;

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