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Enhanced electrochemical property of FePO_4-coated LiNi_(0.5)Mn_(1.5)O_4 as cathode materials for Li-ion battery

Ting-Feng Yi  Yan-Mei Li  Xiao-Ya Li  Jing-Jing Pan  Qianyu Zhang  Yan-Rong Zhu  
【摘要】:Pristine LiNi_(0.5)Mn_(1.5)O_4and FePO_4-coated one with Fd-3m space groups were prepared by a sol-gel method.The structure and performance were studied by X-ray diffraction(XRD)rietveld refinement,scanning electron microscopy(SEM),high resolution transmission electron microscopy(HRTEM),energy dispersive spectrometer(EDS)mapping,electrochemical impedance spectroscopy(EIS)and chargedischarge tests,respectively.The lattice parameters of all samples almost remain the same from the Rietveld refinement,revealing that the crystallographic structure has no obvious difference between pristine LiNi_(0.5)Mn_(1.5)O_4and FePO_4-coated one.All materials show similar morphologies with uniform particle distribution with small particle size,and FePO_4coating does not affect the morphology of LiNi_(0.5)Mn_(1.5)O_4material.EDS mapping and HRTEM show that FePO_4may be successfully wrapped around the surfaces of LiNi_(0.5)Mn_(1.5)O_4particles,and provides an effective coating layer between the electrolyte and the surface of LiNi_(0.5)Mn_(1.5)O_4particles.FePO_4(1 wt%)-coated LiNi_(0.5)Mn_(1.5)O_4cathode shows the highest discharge capacity at high rate(2C)among all samples.After 80 cycles,the reversible discharge capacity of FePO_4(1 wt%)coated Li Ni-0.5Mn1.5O4is 117 m Ah g1,but the pristine one only has 50 m Ah g~(-1).FePO_4coating is an effective and controllable way to stabilize the LiNi_(0.5)Mn_(1.5)O_4/electrolyte interface,and avoids the direct contact between LiNi_(0.5)Mn_(1.5)O_4powders and electrolyte,then suppresses the side reactions and enhances the electrochemical performance of the LiNi_(0.5)Mn_(1.5)O_4.

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