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首页> 外文期刊>RSC Advances >Enhanced high rate performance of Li[Li0.17Ni0.2Co0.05Mn0.58-xAlx]O2-0.5x cathode material for lithium-ion batteries
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Enhanced high rate performance of Li[Li0.17Ni0.2Co0.05Mn0.58-xAlx]O2-0.5x cathode material for lithium-ion batteries

机译：锂离子电池正极材料Li [Li0.17Ni0.2Co0.05Mn0.58-xAlx] O2-0.5x的高倍率性能

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摘要

Pristine Li[Li0.17Ni0.2Co0.05Mn0.58]O-2 (LNCM) and Li[Li0.17Ni0.2Co0.05Mn0.58-xAlx]O2-0.5x (x - 0.01, 0.02 and 0.04) (LNCMA) as Li-rich cathode materials for lithium ion batteries were synthesized via a sol-gel route. Inductively coupled plasma atomic emission spectrometry (ICP-AES), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to investigate the composition, structure and morphology of the LNCM and LNCMA samples. The homogeneous dispersion of the element Al in the LNCMA samples was confirmed using energy dispersive spectroscopic (EDS) mapping. Compared with LNCM, the larger crystal cell volume of LNCMA was verified by XRD and TEM analysis. A blue shift of O1s and Mn2p peaks in the A2 sample was observed via XPS, demonstrating the partial substitution of Al3+ for Mn4+ ions. The electrochemical properties are examined by means of cyclic voltammetry and charge/discharge tests. In general, the Al-substituted samples exhibit a better electrochemical performance. Especially for the A2 sample, it presents an enhanced initial discharge capacity of similar to 300 mA h g(-1), accompanied with the better initial coulombic efficiency of 90.9%. For 5 C rate, the A2 sample delivers a higher discharge capacity of 168.9 mA h g(-1) in the initial cycle and 156.5 mA h g(-1) after 150 cycles, while for the pristine sample it is 126.5 and 98.8 mA h g(-1), respectively. The excellent electrochemical performance of the Al-substituted samples could be ascribed to the enlarged cell volume and improved structural stability resulting from the partial Al substitution.
机译：原始Li [Li0.17Ni0.2Co0.05Mn0.58] O-2（LNCM）和Li [Li0.17Ni0.2Co0.05Mn0.58-xAlx] O2-0.5x（x-0.01、0.02和0.04）（LNCMA）通过溶胶-凝胶法合成了锂离子电池的富锂正极材料。电感耦合等离子体原子发射光谱法（ICP-AES），X射线衍射（XRD），扫描电子显微镜（SEM）和透射电子显微镜（TEM）用于研究LNCM和LNCMA样品的组成，结构和形态。使用能量色散光谱（EDS）映射确认了元素Al在LNCMA样品中的均匀分散。与LNCM相比，通过XRD和TEM分析证实了LNCMA具有更大的晶胞体积。通过XPS观察到了A2样品中O1s和Mn2p峰的蓝移，表明Al3 +被Mn4 +离子部分取代。通过循环伏安法和充电/放电测试检查电化学性能。通常，Al-取代的样品表现出更好的电化学性能。特别是对于A2样品，其初始放电容量增强了，类似于300 mA h g（-1），同时具有更好的初始库仑效率90.9％。在5 C速率下，A2样品在初始循环中的放电容量更高，为168.9 mA hg（-1），在150个循环后的放电容量为156.5 mA hg（-1），而对于原始样品，放电容量为126.5和98.8 mA hg（ -1）。 Al-取代的样品的优异的电化学性能可以归因于部分Al取代导致的增大的电池体积和改善的结构稳定性。

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