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首页> 外文期刊>RSC Advances >Improved electrochemical performance of LiNi0.8Co0.1Mn0.1O2 cathode materials via incorporation of rubidium cations into the original Li sites
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Improved electrochemical performance of LiNi0.8Co0.1Mn0.1O2 cathode materials via incorporation of rubidium cations into the original Li sites

机译：通过改善LiNi 0.8 Co 0.1 Mn 0.1 O 2 正极材料的电化学性能将Li阳离子掺入原始的Li位

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摘要

Layered RbxLi(1?x)Ni0.8Co0.1Mn0.1O2 (x = 0, 0.005, 0.01, 0.02) materials were synthesized with different Rb concentrations using a solid state reaction method. All the materials were calcined at 800 °C for 12 h in a flowing oxygen atmosphere using NiO, CoO, MnO2, Rb2CO3 and LiOH·H2O as the raw materials. The influences of the amount of Rb+ ions in the cathodes on the electrochemical performance were investigated in detail. It was found from the results that the electrochemical performances of Rb doped materials were greatly improved. Among them the Rb0.5% sample presented the best performance; it delivered an initial discharging capacity of 188.9 mA h g?1 at 0.5C, improved by 13.52% when compared with that of a sample without Rb. A capacity retention of 88.9% after 100 cycles and an excellent high-rate performance of 152.3 mA h g?1 at 5C rate were also recorded for the same sample. The Li+ ion diffusion coefficient calculated from EIS turned out a value of 1.14 × 10?10 cm2 s?1, which is 3.42 times that of the non-doped sample. Both the enhanced performance and the accelerated Li+ ion diffusion could be explained by the changes in crystal structures. XRD whole pattern refinement revealed that the Rb+ ions were incorporated into the lattice by replacing the original Li+ ions, which resulted in reduced ionic mixing and the expansion in the c axis that led to the enhanced electrochemical performance. As a whole, incorporation of Rb in LiNi0.8Co0.1Mn0.1O2 by this approach showed great potential to serve as a promising cathode material for future applications.
机译：层状Rb x Li （1？ x ） Ni 0.8 Co 0.1 Mn 0.1 O使用固相反应法合成了具有不同Rb浓度的 2 （ x = 0、0.005、0.01、0.02）材料。使用NiO，CoO，MnO 2 ，Rb 2 CO 3 和LiOH·H 2 O为原料。详细研究了阴极中Rb + 离子的数量对电化学性能的影响。从结果发现，掺杂Rb的材料的电化学性能大大提高。其中，Rb0.5％的样品表现最佳。它在0.5C时的初始放电容量为188.9 mA h g ？1 ，与没有Rb的样品相比，提高了13.52％。相同样品在100C循环后的容量保持率为88.9％，在5C速率下仍具有152.3 mA h g ？1 的优异高倍率性能。通过EIS计算得出的Li + 离子扩散系数为1.14×10 ？10 cm 2 s ？1 ，是未掺杂样品的3.42倍。增强的性能和加速的Li + 离子扩散均可以通过晶体结构的变化来解释。 XRD整体图案精炼显示，通过替换原始的Li + 离子，Rb + 离子被掺入晶格中，这导致减少的离子混合和 c 轴的扩展，从而增强了电化学性能。整体而言，Rb在LiNi 0.8 Co 0.1 Mn 0.1 O 2 具有巨大的潜力，可以用作未来应用的有希望的阴极材料。

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