Synthesis and characterization of Li[Ni0.41Li0.08Mn0.51]O-2 nanoplates for Li battery cathode material
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- Synthesis and characterization of Li[Ni0.41Li0.08Mn0.51]O-2 nanoplates for Li battery cathode material
- Cho, Jaephil; Kim, Yoojin; Kim, Min Gyu
- Cathodes; Lithium batteries; Lithium compounds; Synthesis (chemical); X ray absorption spectroscopy
- Issue Date
- AMER CHEMICAL SOC
- JOURNAL OF PHYSICAL CHEMISTRY C, v.111, no.7, pp.3192 - 3196
- A hydrothermal method was used to prepare hexagonal layered Li[Ni 0.41Li0.08Mn0.51]O2 nanoplates (R3̄m) from a mixed solution of Ni0.14Mn0.86O 2 and LiOH·H2O at 200°C. In addition, an ion-exchange method was used at room temperature to obtain the Ni 0.45Mn0.55O2 precursor from K 0.32MnO2-birnessite. Even though the spinel phase (Fd3m) was dominant at 150°C, it was completely converted into a hexagonal layered phase at 200°C in a condition of excess LiOH·H2O. The as-prepared Li[Ni0.41Li0.08Mn0.51]O2 consisted of stacked nanoplates with a plate thickness of approximately 7 nm. Ex situ X-ray diffraction and X-ray absorption spectroscopy were used to study electrochemical Li insertion and extraction reactions of Li[Ni 0.41Li0.08Mn0.51]O2. The results show that the Li[Ni0.41Li0.08Mn0.51]O 2 electrode operates predominately with the redox couple Ni 2+/Ni4+ between 4.8 and 2 V. On the other hand, the oxidation state of Mn was constant, even at a 4.8 V change, indicating that the 4+ state was predominant. The cycling behavior between 2 and 4.8 V at a current rate of 60 mA/g shows a maximum capacity of 200 mA h/g with only a slight capacity fading out to 30 cycles.
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