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采用草酸盐共沉淀法合成一系列的Li(Ni1/3Co1/3Mn1/3)1-xCrxO2正极材料(0≤x≤0.1),用X射线衍射仪(XRD)和扫描电子显微镜(SEM)分析合成产物的晶体结构及表面形貌;利用充放电仪测定了产物的电化学性能.结果表明,合成的Li(Ni1/3Co1/3Mn1/3)1-xCrxO2(x=0.01,0.03,0.05,0.07)均保持α-2NaFeO2层状结构相,属于空间R3m点群.Li(Ni1/3Co1/3Mn1/3)0.95Cr0.05O2的电化学性能最佳,首次放电容量达158.6 mAh/g,在2.5～4.5 V区间30次循环后比容量衰竭率仅为3.92%.Li(Ni1/3Co1/3Mn1/3)0.95Cr0.05O2和Li(Ni1/3Co1/3Mn1/3)CrO2的电极阻抗变化不同,进而影响其电化学性能.
A series of Li (Ni1 / 3Co1 / 3Mn1 / 3) 1-xCrxO2 cathode materials (0≤x≤0.1) were synthesized by oxalate coprecipitation method and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) The crystal structure and surface morphology of the synthesized product were characterized by X-ray diffraction (XRD) and electrochemical impedance spectroscopy (XRD) ) Retained the α-2NaFeO2 lamellar structure, which belongs to the point group R3m in space.The electrochemical performance of Li (Ni1 / 3Co1 / 3Mn1 / 3) 0.95Cr0.05O2 was the best, with an initial discharge capacity of 158.6 mAh / The specific capacity depletion rate was only 3.92% after 30 cycles in the 4.5 V range.The electrode impedance of Li (Ni1 / 3Co1 / 3Mn1 / 3) 0.95Cr0.05O2 and Li (Ni1 / 3Co1 / 3Mn1 / 3) Its electrochemical properties.