Citation: 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 Na_0.66Mn_0.675Ni_0.1625Co_0.1625O₂ for Sodium-Ion Batteries[J]. Acta Physico-Chimica Sinica, ;2016, 32(6): 1489-1494. doi: 10.3866/PKU.WHXB2016032802 shu

Electron Microscopy Study of Surface Reconstruction and Its Evolution in P2-Type Na_0.66Mn_0.675Ni_0.1625Co_0.1625O₂ for Sodium-Ion Batteries

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

Received Date: 17 March 2016
Revised Date: 26 March 2016

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

We performed an aberration-corrected scanning transmission electron microscopy (STEM) and energy-dispersive X-ray spectroscopy (EDS) study of Na_0.66Mn_0.675Ni_0.1625Co_0.1625O₂, 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.
- Sodium ion battery,
- P2-type layer-structured cathode material,
- Surface reconstruction,
- Scanning transmission electron microscopy
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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

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通讯作者: 陈斌, bchen63@163.com

Electron Microscopy Study of Surface Reconstruction and Its Evolution in P2-Type Na_0.66Mn_0.675Ni_0.1625Co_0.1625O₂ for Sodium-Ion Batteries