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首页> 外文期刊>Advanced Functional Materials >Combining In Situ Synchrotron X-Ray Diffraction and Absorption Techniques with Transmission Electron Microscopy to Study the Origin of Thermal Instability in Overcharged Cathode Materials for Lithium-Ion Batteries
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Combining In Situ Synchrotron X-Ray Diffraction and Absorption Techniques with Transmission Electron Microscopy to Study the Origin of Thermal Instability in Overcharged Cathode Materials for Lithium-Ion Batteries

机译：结合原位同步加速器X射线衍射和吸收技术与透射电子显微镜研究锂离子电池过充正极材料的热不稳定性起源

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摘要

The thermal instability of the cathode materials in lithium-ion batteries is an important safety issue, requiring the incorporation of several approaches to prevent thermal runaway and combustion. Systematic studies, using combined well-defined in situ techniques, are crucial to obtaining in-depth understanding of the structural origin of this thermal instability in overcharged cathode materials. Here time-resolved X-ray diffraction, X-ray absorption, mass spectroscopy, and high-resolution transmission electron microscopy during heating are combined to detail the structural changes in overcharged Li_x.Ni_(0.8)Co_(0.15)Al_(0.05)O_2 and Li_xNi_(1/3)Co_(1/3)Mn_(1/3)O_2 cathode materials. By employing these several techniques in concert, various aspects of the structural changes are investigated in these two materials at an overcharged state; these include differences in phase-distribution after overcharge, phase nucleation and propagation during heating, the preferred atomic sites and migration paths of Ni, Co, and Mn, and their individual contributions to thermal stability, together with measuring the oxygen release that accompanies these structural changes. These results provide valuable guidance for developing new cathode materials with improved safety characteristics.
机译：锂离子电池中正极材料的热不稳定性是一个重要的安全问题，需要采用多种方法来防止热失控和燃烧。使用结合明确定义的原位技术的系统研究对于深入了解过度充电的阴极材料中这种热不稳定性的结构成因至关重要。结合时间分辨的X射线衍射，X射线吸收，质谱和加热过程中的高分辨率透射电子显微镜，详细描述了过充Li_x.Ni_（0.8）Co_（0.15）Al_（0.05）O_2的结构变化Li_xNi_（1/3）Co_（1/3）Mn_（1/3）O_2正极材料。通过协同使用这几种技术，可以研究这两种材料在过度充电状态下结构变化的各个方面。这些包括过充电后的相分布，加热过程中的相成核和传播，Ni，Co和Mn的首选原子位点和迁移路径的差异，以及它们对热稳定性的单独贡献，以及测量这些结构所伴随的氧气释放变化。这些结果为开发具有改进安全特性的新型阴极材料提供了有价值的指导。

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  • 来源
    《Advanced Functional Materials》 |2013年第8期|1047-1063|共17页
  • 作者

    Kyung-Wan Nam; Seong-Min Bak; Enyuan Hu; Xiqian Yu; Youngning Zhou; Xiaojian Wang; Lijun Wu; Yimei Zhu; Kyung-Yoon Chung; Xiao-Qing Yang;

  • 作者单位

    Chemistry Department Brookhaven National Laboratory Upton, NY 11973, USA;

    Chemistry Department Brookhaven National Laboratory Upton, NY 11973, USA;

    Chemistry Department Brookhaven National Laboratory Upton, NY 11973, USA;

    Chemistry Department Brookhaven National Laboratory Upton, NY 11973, USA;

    Chemistry Department Brookhaven National Laboratory Upton, NY 11973, USA;

    Chemistry Department Brookhaven National Laboratory Upton, NY 11973, USA;

    Condensed Matter Physics and Material Science Department Brookhaven National Laboratory Upton, NY 11973, USA;

    Condensed Matter Physics and Material Science Department Brookhaven National Laboratory Upton, NY 11973, USA;

    Center for Energy Convergence Green City Technology Institute Korea Institute of Science and Technology Seoul, 136-791, Korea;

    Chemistry Department Brookhaven National Laboratory Upton, NY 11973, USA;

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