采用高温固相合成法制备富锂锰基正极材料Li1.2Ni0.13Co0.13Mn0.54-xZnxO2(x=0,0.03,0.06,0.10),Zn2+掺杂对Li1.Ni0.3 Co0.13Mn0.54O2的表面特性和电化学性能都有影响.通过X射线衍射(XRD)、扫描电子显微镜(SEM)、拉曼光谱分析、充放电测试、倍率特性测试、循环性能测试,分析了该合成材料的晶体结构、形貌特征、微观结构和电化学性能.富锂锰基正极材料为a-NaFeO2层状结构,R-3m空间群,结晶度高,结构稳定性好,其中Li1.2Ni0.13Co0.13 Mn0.48 Zn0.06O2的电化学性能较好.掺杂Zn2+可以提高富锂锰基正极材料的充放电比容量、倍率性能、循环性能等电化学性能.
A series of Li-rich manganese cathode materials Li1.2 Ni0.13 Co0.13 Mn0.54-xZnxO2 (x=0,0.03,0.06,0.10) were synthesized through a high temperature solid state route,and influences of Zn2+ doping on surface property and electrochemical performance of the layered Li1.2 Ni0.13 Co0.13 Mn0.54 O2 were studied.X-ray diffractometry (XRD),scanning electron microscopy (SEM),Raman spectroscopy,charge-discharge measurements and electrochemical impedance spectroscopy were adopted to analyze and determine the crystal structures,appearance characteristics,microstructures and electrochemical performances of the synthesized cathodes.The as-synthesized Li-rich manganese cathode materials are a-NaFeO2 layered structure,which belongs to R-3m space group,with high crystallinity and structural stability.The electrochemical performance of Li1.2Ni0.13Co0.13Mn0.48Zn0.06O2 was better than the other cathodes.We proved that Zn2+ doping can improve the electrochemical properties of Li-rich manganese cathode material,such as charge and discharge specific capacity,rate performance and cycling performance.
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