Synthesis and electrochemical properties of nanosized LiFeO2 particles with a layered rocksalt structure for lithium batteries |
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| Authors: | Masaaki Hirayama Hiroki Tomita Kei Kubota Hidekazu Ido Ryoji Kanno |
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| Affiliation: | 1. Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;2. College of Material Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;4. Laboratory for Advanced Materials and Electron Microscopy, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;5. Max Planck Institute for Chemical Physics of Solids, Dresden 01187, Germany;6. Synchrotron Soleil, L''Orme des Merisiers, St-Aubin, Gif-sur-Yvette 91192 CEDEX, France;7. School of Physical Science and Information Technology, Liaocheng University, Liaocheng 252059, China;8. Qingdao Industrial Energy Storage Research Institute, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China;9. National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan |
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| Abstract: | Layered rocksalt-type LiFeO2 particles (O3-LiFeO2) with average particle sizes of ca. 40 and 400 nm were synthesized by an ion exchange reaction from α-NaFeO2 precursors. X-ray diffraction (XRD) patterns and scanning electron microscopy (SEM) images confirmed the formation of nanosized O3-LiFeO2. 40-nm LiFeO2 exhibited a higher discharge capacity (115 mAh g?1) than 400-nm LiFeO2 (80 mAh g?1), and also had better rate characteristics. The downsizing effect and cation disorder between the lithium and iron layers may have improved the electrochemical activity of the LiFeO2 particles. Transmission electron microscopy (TEM) observation indicated a phase transition from O3-LiFeO2 to a cubic lattice system during the electrochemical process. The cubic lithium iron oxide exhibited stable electrochemical reactions based on the Fe2+/Fe3+ and Fe2+/Fe0 redox couples at voltages between 4.5 and 1.0 V. The discharge capacities of 40-nm LiFeO2 were ca. 115, 210, and 390 mAh g?1 under cutoff voltages of 4.5–2.0 V, 4.5–1.5 V, and 4.5–1.0 V, respectively. |
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