Effects of W-doping on precursor growth of LiNi0.88Co0.09Mn0.03O2 and its electrochemical performance
W-doped LiNi0.88Co0.09Mn0.03O2 cathodes were fabricated by using W-doped precursors.X-ray diffraction indicates that W-doping suppresses the crystal growth of the precursor along the direction perpendicular to c-axis.Scanning electron microscopy results show that the primary particles of the cathode become finer with the increase of W-doping amount.Electrochemical measurements prove the merits of the W-doped cathodes.The one with 0.4 wt.％W-doping shows significantly improved electrochemical properties compared with the pristine one.After 100 charge-discharge cycles at a high rate of 10C,it exhibits capacity retentions of 94.68％and 89.63％at 25 and 45 ℃,respectively.The intergranular cracks after cycles are also suppressed by W-doping.Hence,profiting from the synergistic effect of component regulation and microstructure engineering by W-doping,the Li+diffusion kinetics is boosted,and the structural stability is enhanced.
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