Charging Reactions Promoted by Geometrically Necessary Dislocations in Battery Materials Revealed by In Situ Single‐Particle Synchrotron Measurements
Charging Reactions Promoted by Geometrically Necessary Dislocations in Battery Materials Revealed by In Situ Single‐Particle Synchrotron Measurements
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DOI：
10.1002/adma.202003417
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发表时间：
2020-08
影响因子：
29.4
通讯作者：
Zhengrui Xu;D. Hou;David J. Kautz;Wenjun Liu;R. Xu;Xianghui Xiao;Feng Lin
中科院分区：
文献类型：
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作者：
Zhengrui Xu;D. Hou;David J. Kautz;Wenjun Liu;R. Xu;Xianghui Xiao;Feng Lin
许多氧化还原活性能源材料（例如电池和催化剂材料）中存在晶体缺陷，这显着改变了其能量存储和转换的化学性质。然而，对晶体缺陷和氧化还原反应之间的相互关系缺乏定量理解。据报道，晶体学缺陷，例如几何必要位错，通过单颗粒、多模态和原位同步加速器测量影响电池颗粒中的氧化还原反应。通过劳厄 X 射线微衍射，可以从许多层状氧化物颗粒中的大量衍射图案中对许多晶体缺陷进行空间识别和统计量化，包括几何上必要的位错、倾斜边界和混合缺陷。结合微衍射和X射线光谱成像的原位和异位测量表明，具有较高几何必要位错浓度的LiCoO2颗粒可提供更深的充电反应，表明位错可能促进初始充电期间层状氧化物中的氧化还原反应。本研究表明，精确控制晶体缺陷及其分布可以潜在地促进和均匀化电池材料中的氧化还原反应。
Crystallographic defects exist in many redox active energy materials, e.g., battery and catalyst materials, which significantly alter their chemical properties for energy storage and conversion. However, there is lack of quantitative understanding of the interrelationship between crystallographic defects and redox reactions. Herein, crystallographic defects, such as geometrically necessary dislocations, are reported to influence the redox reactions in battery particles through single‐particle, multimodal, and in situ synchrotron measurements. Through Laue X‐ray microdiffraction, many crystallographic defects are spatially identified and statistically quantified from a large quantity of diffraction patterns in many layered oxide particles, including geometrically necessary dislocations, tilt boundaries, and mixed defects. The in situ and ex situ measurements, combining microdiffraction and X‐ray spectroscopy imaging, reveal that LiCoO2 particles with a higher concentration of geometrically necessary dislocations provide deeper charging reactions, indicating that dislocations may facilitate redox reactions in layered oxides during initial charging. The present study illustrates that a precise control of crystallographic defects and their distribution can potentially promote and homogenize redox reactions in battery materials.