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Material Sciences 2021
LiNi0.6Co0.2Mn0.6O2正极材料的Na和Br共掺杂改性
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Abstract:
LiNi0.6Co0.2Mn0.6O2正极材料因其高比容量而受到科学研究者的广泛研究，但是依然存在着倍率性能差、界面稳定性差和结构稳定性差等问题，严重制约了其进一步的发展。针对这些问题，本文探究了Na和Br 的共掺杂量对材料性能的影响，并通过X射线衍射(XRD)、XRD精修、交流阻抗(EIS)、循环伏安曲线(CV)以及充放电测试等方法进行了分析和表征。结果表明，适当的Na+和Br-掺杂能够改善材料的电化学性能。当掺杂量为1%的样品具有比较优异的结构稳定性和电化学性能。其在5 C下的容量高达178.2 mAh/g；1 C循环50次后容量保持率为86.0%，并且有最小的电压衰减。
LiNi0.6Co0.2Mn0.6O2 cathode material has been extensively studied by scientific researchers owing to its high specific capacity, but there are still problems such as poor rate performance, poor interface stability, and poor structural stability, which severely restrict its further development. In response to these problems, this article explores the influence of the co-doping amount of Na+ and Br- on the material properties, and the structure and electrochemical properties were characterized and analyzed by using X-ray diffraction (XRD), XRD refinement, AC impedance (EIS), cyclic voltammetry (CV), and galvanostatic charge-discharge measurements. The results show that appropriate Na+ and Br- co-doping can improve the electrochemical properties of the materials. When the doping amount is 1%, the sample has more excellent structural stability and electrochemical performance. Its capacity at 5 C is as high as 178.2 mAh/g. The capacity retention is still 86.0% and the voltage attenuation is minimal after 50 cycles at 1 C.
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