Manipulating Layered P2@P3 Integrated Spinel Structure Evolution for High-Performance Sodium-Ion Battery.
Manipulating Layered P2@P3 Integrated Spinel Structure Evolution for High-Performance Sodium-Ion Battery.
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DOI：
10.1002/anie.201915650
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发表时间：
2020-02
影响因子：
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通讯作者：
Yan‐Fang Zhu;Yao Xiao;Weibo Hua;S. Indris;S. Dou;Yu‐Guo Guo;S. Chou
中科院分区：
文献类型：
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作者：
Yan‐Fang Zhu;Yao Xiao;Weibo Hua;S. Indris;S. Dou;Yu‐Guo Guo;S. Chou
对于钠离子电池阴极来说，循环过程中的结构演变对其电化学性能起着至关重要的作用。在此，通过工程的晶体结构结合化学元素替代的策略，我们设计了层状P2@P3集成尖晶石Na0.5Ni0.1Co0.15Mn0.65Mg0.1O2氧化物阴极。这种新型电极由于其三相共生结构和阳离子取代策略的协同作用而显示出优异的钠离子半/全电池性能。基于原子分辨率的扫描透射电子显微镜的组合分析，以及基于非原位同步加速器的X射线吸收光谱和基于原位同步加速器的X射线衍射图案，固有的层状P2@P3集成尖晶石结构，电荷补偿机制，结构演化和相变被清楚地阐明和确认。该研究深入了解了这种特殊结构中的结构-性能关系，并通过操纵结构演化为高性能电池阴极的设计开辟了一个新的领域。
As for sodium-ion battery cathodes, the structure evolution during cycling plays a vital role in their electrochemical performance. Herein, through a strategy for engineering the crystal structure coupled with chemical element substitution, we design a layered P2@P3 integrated spinel Na 0.5 Ni 0.1 Co 0.15 Mn 0.65 Mg 0.1 O 2 oxide cathode. This novel electrode shows excellent sodium-ion half/full battery performance due to the synergistic effects of its triphase intergrowth structure and cation substitution strategy. Based on combined analyses by scanning transmission electron microscopy with atomic resolution, as well as ex-situ synchrotron-based X-ray absorption spectra and in-situ synchrotron-based X-ray diffraction patterns, the inherent layered P2@P3 integrated spinel structure, charge compensation mechanism, structural evolution, and phase transition are clearly articulated and confirmed. This study provides an in-depth understanding of the structure-performance relationship in this special structure and opens up a novel field via manipulating structural evolution for the design of high-performance battery cathodes.