イオン交換法によるLiNi.Mn.O正極材料のイオン分布と電気化学特性
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概要
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An order-disorder behavior of Li and Ni in LiNi0.5Mn0.5O2 was investigated by means of the ion-exchange preparation and the high-temperature X-ray diffraction measurement using synchrotron radiation. Rietveld refinements at room temperature showed that the occupancy of Ni at the Li site prepared by ion-exchange is less than those by co-precipitation and it increases with an increase in temperature and time for the ion-exchange reaction. In addition, it was found that by high-temperature XRD measurements an order-disorder transition occurs at around 700 K for the sample prepared by the ion-exchange. Further, we have confirmed that an optimum ion distribution in LiNi0.5Mn0.5O2 exists to show superior electrochemical performance as a positive electrode for Li-ion batteries. These results demonstrate a close relation between crystal structure and electrochemical properties for LiNi0.5Mn0.5O2 which is a member of Li2MnO3-based materials. It is the first report that presents an order-disorder transition of LiNi0.5Mn0.5O2 at elevated temperatures, on the basis of the experimental results.
著者
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MAEDA Hiroyuki
Department of Chemistry, Materials Engineering, Kansai University
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ARACHI Yoshinori
Department of Chemistry, Materials Engineering, Kansai University
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NAKAMURA Momoko
Department of Chemistry, Materials Engineering, Kansai University
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MAEDA Hiroyuki
Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology (AIST)
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