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The phase transition and optimal synthesis temperature of LiNiO2 |
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| Authors: | Zhonghua Lu Xuejie Huang Hong Huang Liquan Chen and Joop Schoonman |
| Institution: | a Laboratory for Solid State Ionics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China b Delft Interfaculty Research Center: Renewable Energy Laboratory for Inorganic Chemistry, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands |
| Abstract: | The phase transition of LiNiO2 has been studied by using impedance spectroscopy, DTA, and X-ray diffraction methods. At 720°C the hexagonal phase changes in air to the cubic phase. The phase transition process is rather slow and partially reversible. A peculiar conductivity behavior was observed. From 324°C the conductivity deviates from Arrhenius behavior and is temperature-invariant until 613°C. Subsequently, it decreases rapidly with increase of the temperature. This phenomenon is related to the occupation of Ni2+ in Li+ positions. The optimal sintering temperature for LiNiO2 is suggested to be 700°C. |
| Keywords: | Phase transition Impedance spectroscopy DTA X-ray diffraction |
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