Observation of anisotropic microstructural changes during cycling in LiNi0.5Co0.2Mn0.3O2 cathode material

被引：40
作者：
Kuriyama, Hiromichi [1 ]
Saruwatari, Hidesato [1 ]
Satake, Hideki [1 ]
Shima, Amika [2 ]
Uesugi, Fumihiko [2 ]
Tanaka, Hiroki [3 ]
Ushirogouchi, Tooru [1 ]
机构：
[1] Toshiba Co Ltd, Social Infrastruct Syst Co, Saiwai Ku, Kawasaki, Kanagawa 2120013, Japan
[2] Toshiba Nanoanal Corp, Isogo Ku, Yokohama, Kanagawa 2358522, Japan
[3] Toshiba Co Ltd, Corp Res & Dev Ctr, Saiwai Ku, Kawasaki, Kanagawa 2128582, Japan
来源：
JOURNAL OF POWER SOURCES | 2015年 / 275卷
关键词：
Li ion secondary battery; Cathode; Microstructural changes; Transmission electron microscopy; Electron energy-loss spectroscopy; X-RAY-ABSORPTION; ELECTRONIC-STRUCTURE; HIGH-POWER; LONG-LIFE; LITHIUM; MICROSCOPY; PARTICLES; LINIO2;
D O I：
10.1016/j.jpowsour.2014.10.197
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Microstructural changes in LiNi0.5Co0.2Mn0.3O2 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 LiNi0.5Co0.2Mn0.3O2 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 Mn4+ 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 LiNi0.5Co0.2Mn0.3O2 is different from that of other LiNiO2-based cathode materials previously reported. Tailoring the transition metal ion content ratios is expected to give LiNi1-x-yCoxMnyO2 various levels of surface stability. (C) 2014 Elsevier B.V. All rights reserved.
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页码：99 / 105
页数：7
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