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首页> 外文期刊>RSC Advances >The positive role of (NH4)3AlF6 coating on Li[Li0.2Ni0.2Mn0.6]O2 oxide as the cathode material for lithium-ion batteries
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The positive role of (NH4)3AlF6 coating on Li[Li0.2Ni0.2Mn0.6]O2 oxide as the cathode material for lithium-ion batteries

机译：（NH 4 ） 3 AlF 6 涂层在Li [Li 0.2 Ni 0.2 Mn 0.6 ] O 2 氧化物作为锂离子电池的正极材料

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摘要

Different amounts of (NH4)3AlF6 (1, 3, and 6 wt%) are successfully coated on the surface of the layered lithium-rich cathode Li[Li0.2Ni0.2Mn0.6]O2 using a wet coating method. The morphology and structure of the as-prepared materials are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDX). It is confirmed that the (NH4)3AlF6 was uniformly coated onto the surface of the Li[Li0.2Ni0.2Mn0.6]O2. The electrochemical performance of the coated materials at room temperature and 50?°C is investigated systematically. The material coated with 3 wt% (NH4)3AlF6 exhibits the highest reversible capacity of 220.3 mA h g?1 (0.2C, 50 cycles) as well as the best cycling performance with a capacity retention of 83.4% (0.2C, 50 cycles), attributed to the suppression of unexpected surface side reactions by the protective layer of (NH4)3AlF6. Electrochemical impedance spectroscopy (EIS) analysis reveals that the lower charge transfer resistance of the coated sample may contribute to its excellent rate capability. Furthermore, the coated sample also shows enhanced cycling performance at elevated temperature owing to an improved thermal stability, confirmed by differential scanning calorimetry (DSC).
机译：不同数量的（NH 4 ） 3 AlF 6 （1、3和6 wt％）成功涂覆在层状富锂阴极Li [Li 0.2 Ni 的表面上使用湿涂法将0.2 Mn 0.6 ] O 2 。通过X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM）和能量分散X射线光谱（EDX）表征所制备材料的形态和结构。确认（NH 4 ） 3 AlF 6 均匀地涂在Li [Li 0.2 Ni 0.2 Mn 的表面上 0.6 ] O 2 。系统地研究了涂层材料在室温和50°C下的电化学性能。涂覆了3 wt％（NH 4 ） 3 AlF 6 的材料sub> 具有220.3 mA hg ？1 的最高可逆容量（0.2C，50个循环）以及最佳循环性能，容量保持率为83.4％（0.2C，50个循环），归因于保护层（NH 4 ） 3 < / sub> AlF 6 。电化学阻抗谱（EIS）分析表明，涂层样品的较低电荷转移电阻可能有助于其优异的速率能力。此外，经涂覆的样品由于改进的热稳定性而在高温下也显示出增强的循环性能，这通过差示扫描量热法（DSC）证实。

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