P2型钠离子电池正极材料Na0.66Mn0.675Ni0.1625Co0.1625O2的表面重构及其演变的电子显微表征

doi:10.3866/PKU.WHXB2016032802

Abstract

Abstract:

We performed an aberration-corrected scanning transmission electron microscopy(STEM)andenergy-dispersive X-ray spectroscopy(EDS)study of Na_0.66Mn_0.675Ni_0.1625Co_0.1625O₂,which was prepared via a solidstatereaction for sodium-ion battery applications.Powder X-ray diffraction(XRD)showed that the material hada well-crystallized P2-type layered structure(P6₃/mmc).Results from further STEM and EDS analyses showedthe presence of reconstructed surface layers of thickness about 1-2 nm,which contained a large amount ofantisite defects and obvious lattice distortions.Detailed chemical analysis showed an inhomogeneous elementaldistribution inside these reconstructed surface layers;they were cobalt rich and nickel deficient.These surfacelayers further evolved into thicker regions of width 5-10 nm,accompanied by a spinel(Fd3m)phase to rocksaltphase(Fm3m)transition.

Key words: Sodium ion battery, P2-type layer-structured cathode material, Surface reconstruction, Scanning transmission electron microscopy

MSC2000:

O646

Wei HUANG,Chun-Yang WU,Yue-Wu ZENG,Chuan-Hong JIN,Ze ZHANG. 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 Phys. -Chim. Sin., 2016, 32(6): 1489-1494.

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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

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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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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