Li0.93[Li0.21Co0.28Mn0.51]O2 nanoparticles for lithium battery cathode material made by cationic exchange from K-birnessite |
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| Institution: | 1. Institute of Earth Surface Dynamics, University of Lausanne, Lausanne 1015, Switzerland;2. Stanford Synchrotron Radiation Lightsource Directorate, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, United States;3. Geochemistry Department, Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States;1. Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China;2. Key Laboratory of Poyang Lake Basin Agricultural Resource and Ecology of Jiangxi Province, College of Land Resource and Environment, Jiangxi Agricultural University, Nanchang 330045, China;3. Physical Chemistry and Soft Matter, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands;4. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China |
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| Abstract: | Li0.93Li0.21Co0.28Mn 0.51]O2 nanoparticles with an R-3m space group is hydrothermally prepared from Co0.35Mn0.65O2 obtained from an ion-exchange reaction with K-birnessite K0.32MnO2 at 200 °C. Even at a hydrothermal reaction temperature of 150 °C, the spinel (Fd3m) phase is dominant, and a layered phase became dominant by combining an increase in the temperature to 200 °C with an increase in lithium concentration. The as-prepared cathode particle has plate-like hexagonal morphology with a size of 100 nm and thickness of 20 nm. The first discharge capacity of the cathode is 258 mAh/g with an irreversible capacity ratio of 22%, and the capacity retention after 30 cycles is 95% without developing a plateau at ～3 V. Capacity retention of the cathode discharge is 84% at 4C rate (=1000 mA/g) and shows full capacity recovery when decreasing the C rate to 0.1 C. |
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