Observation of anisotropic microstructural changes during cycling in LiNi sub(0.5)Co sub(0.2)Mn sub(0.3)O sub(2) cathode material

Microstructural changes in LiNi sub(0.5)Co sub(0.2)Mn sub(0.3)O sub(2) cathode material after charge/discharge cycles were investigated by transmission electron microscopy and electron energy loss-spectroscopy. The microstructure on the surface of the cycled primary particles of LiNi sub(0.5)Co sub(...

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Bibliographic Details
Published in:Journal of power sources 2015-02, Vol.275, p.99-105
Main Authors: Kuriyama, Hiromichi, Saruwatari, Hidesato, Satake, Hideki, Shima, Amika, Uesugi, Fumihiko, Tanaka, Hiroki, Ushirogouchi, Tooru
Format: Article
Language:English
Subjects:
Cathodes
Charge
Cycles
Discharge
Microstructure
Power sources
Surface stability
Transition metals
Valence
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Summary:Microstructural changes in LiNi sub(0.5)Co sub(0.2)Mn sub(0.3)O sub(2) cathode material after charge/discharge cycles were investigated by transmission electron microscopy and electron energy loss-spectroscopy. The microstructure on the surface of the cycled primary particles of LiNi sub(0.5)Co sub(0.2)Mn sub(0.3)O sub(2) changed from an ordered rock-salt structure into a metal monoxide-type rock-salt structure, and this was accompanied by reduction of the oxidation states of the transition metal ions, especially the Mn super(4+) ions. It should be noted that the (0001) surface of the primary particles remained intact after the cycling test. These results indicate that the degradation mechanism of LiNi sub(0.5)Co sub(0.2)Mn sub(0.3)O sub(2) is different from that of other LiNiO sub(2)-based cathode materials previously reported. Tailoring the transition metal ion content ratios is expected to give LiNi sub(1-x-y)C o sub(x)Mn sub(y)O sub(2) various levels of surface stability.
ISSN:0378-7753
DOI:10.1016/j.jpowsour.2014.10.197