Abstract The LiNi 0.80 Co 0.15 Al 0.05 O 2 (NCA) cathode is endowed with a high energy density and excellent cycling performance. However, the preparation conditions for this material are quite harsh. Therefore, it is rather significant to obtain well-qualified NCA by simple solid-phase synthesis. In this study, the solid-phase synthesis of NCA cathode material is carried out by mixing two types of raw materials via stirring or sand milling. The effects of different particle sizes on the structure and morphology of NCA materials are analyzed. Owing to the different particle sizes of the raw materials, the diffusion path of Li + between the solid phases differs greatly. The XRD results show that the samples mixed by stirring have a worse cation mixture than those mixed by sand milling due to the larger particle size, smaller sintering surface energy, and insufficient sintering strength. The electrochemical results show that the sample mixed by sand milling has a higher specific capacity at a low rate, the initial discharge capacity is 199.22 mAh g −1 , and the capacity retention rate is 86.9% after 50 cycles. In contrast, the initial discharge capacity of the sample mixed by stirring is 184.86 mAh g −1 , and the capacity is 171.93 mAh g −1 after 50 cycles with a 93.0% capacity retention rate.

中文翻译：

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固相合成锂离子电池LiNi 0.80 Co 0.15 Al 0.05 O 2 正极材料不同微纳米尺寸的结构和形貌演变

摘要 LiNi 0.80 Co 0.15 Al 0.05 O 2 (NCA)正极具有高能量密度和优异的循环性能。然而，这种材料的制备条件相当苛刻。因此，通过简单的固相合成获得合格的NCA具有重要意义。在本研究中，NCA正极材料的固相合成是通过搅拌或砂磨混合两种原料来进行的。分析了不同粒径对NCA材料结构和形貌的影响。由于原料的粒径不同，固相间Li + 的扩散路径差异很大。XRD结果表明，搅拌混合的样品由于粒径较大，其阳离子混合物比砂磨混合的样品更差，烧结表面能较小，烧结强度不足。电化学结果表明，砂磨混合的样品在低倍率下具有较高的比容量，初始放电容量为199.22 mAh g -1 ，50次循环后容量保持率为86.9%。相比之下，搅拌混合样品的初始放电容量为184.86 mAh g -1 ，50次循环后容量为171.93 mAh g -1 ，容量保持率为93.0%。