PENG Jiming, CHEN Yuhua, LIU Shicheng, et al. Effect of Ni/Co/Mn molar ratio on structure and electrochemical properties of xLi2MnO3-(1-x)LiMO2 cathode material[J]. CIESC Journal, 2016, (7): 2950-2955. DOI: 10.11949/j.issn.0438-1157.20151501.
PENG Jiming, CHEN Yuhua, LIU Shicheng, et al. Effect of Ni/Co/Mn molar ratio on structure and electrochemical properties of xLi2MnO3-(1-x)LiMO2 cathode material[J]. CIESC Journal, 2016, (7): 2950-2955. DOI: 10.11949/j.issn.0438-1157.20151501.DOI:
Li-rich layered cathode materials were synthesized by a facile co-precipitation method with NaOH and NH3·H2O. The effect of Ni/Co/Mn molar ratio on the structure
morphology and electrochemical properties of the as-prepared material were intensively investigated through X-ray diffraction (XRD)
Raman spectra
scanning electron microscopy (SEM)
cyclic voltammetry (CV)
electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge tests. The Li1.2Mn0.54Ni0.13Co0.13O2 sample had good crystallity
uniform distribution of particle size and excellent electrochemical performance. It delivered the largest initial discharge capacity (247.9 mA·h·g-1) and coulombic efficiency (75.1%) at 0.1C-rate. Furthermore
it showed a high discharge capacity of 236.2 mA·h·g-1 at 1C-rate and a capacity retention of 88.3% after 50 cycles.