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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2016,Vol.32>> Issue(6)>> 1489-1494     doi: 10.3866/PKU.WHXB2016032802         中文摘要
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Electron Microscopy Study of Surface Reconstruction and Its Evolution in P2-Type Na0.66Mn0.675Ni0.1625Co0.1625O2 for Sodium-Ion Batteries
HUANG Wei, WU Chun-Yang, ZENG Yue-Wu, JIN Chuan-Hong, ZHANG Ze
State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
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We performed an aberration-corrected scanning transmission electron microscopy (STEM) and energy-dispersive X-ray spectroscopy (EDS) study of Na0.66Mn0.675Ni0.1625Co0.1625O2, which was prepared via a solidstate reaction for sodium-ion battery applications. Powder X-ray diffraction (XRD) showed that the material had a well-crystallized P2-type layered structure (P63/mmc). Results from further STEM and EDS analyses showed the presence of reconstructed surface layers of thickness about 1-2 nm, which contained a large amount of antisite defects and obvious lattice distortions. Detailed chemical analysis showed an inhomogeneous elemental distribution inside these reconstructed surface layers; they were cobalt rich and nickel deficient. These surface layers further evolved into thicker regions of width 5-10 nm, accompanied by a spinel (Fd3m) phase to rocksalt phase (Fm3m) transition.



Keywords: Sodium ion battery   P2-type layer-structured cathode material   Surface reconstruction   Scanning transmission electron microscopy  
Received: 2016-03-17 Accepted: 2016-03-26 Publication Date (Web): 2016-03-28
Corresponding Authors: JIN Chuan-Hong Email: chhjin@zju.edu.cn

Fund: The project was supported by the National Natural Science Foundation of China (51222202).

Cite this article: HUANG Wei, WU Chun-Yang, ZENG Yue-Wu, JIN Chuan-Hong, ZHANG Ze. Electron Microscopy Study of Surface Reconstruction and Its Evolution in P2-Type Na0.66Mn0.675Ni0.1625Co0.1625O2 for Sodium-Ion Batteries[J]. Acta Phys. -Chim. Sin., 2016,32 (6): 1489-1494.    doi: 10.3866/PKU.WHXB2016032802
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Authors
HUANG Wei
WU Chun-Yang
ZENG Yue-Wu
JIN Chuan-Hong
ZHANG Ze

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