Abstract Nickel rich LiNi1-x-yCoxMnyO2 cathode materials have drawn great attention due to its high capacity and high output voltage, thus leading to a high energy density, which could be potentially applicable in electric vehicles and hybrid electric vehicles. However, the rate capability and long cycle performance of NCM have to be further improved for practical application. In this study, a urea based hydrothermal reaction with sodium 1-dodecanesulfonate (SDS) as the surfactant followed by calcination process was proposed to synthesize NCM523 materials. The obtained compounds possess micro-nano structure (micro-sized rugby particles consisting of nanosheets). The use of urea and SDS play a vital role in the morphology and structure of the synthesized materials, which have been systematically studied. The sample U-4 exhibits the closest metal ratio to the designed one, and its electrochemical performances are superior. It retains 82.9% capacity retentions (3.0‐4.3 V at 0.1 C, 25 °C) after 100 cycles and delivers a high rate capacity of 112.4 mAh⋅g−1 at 10C. These remarkable performances were attributed to the synergistic effect of the intrinsic property of NCM 523 and the micro-nano morphology.

中文翻译：

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用于高性能锂离子电池的微纳米结构水热合成橄榄球状LiNi0.5Co0.2Mn0.3O2正极材料

摘要 富镍LiNi1-x-yCoxMnyO2正极材料因其高容量、高输出电压、高能量密度而备受关注，有望应用于电动汽车和混合动力汽车。然而，NCM的倍率性能和长循环性能在实际应用中还需要进一步提高。在这项研究中，提出了以 1-十二烷磺酸钠 (SDS) 作为表面活性剂的尿素基水热反应，然后进行煅烧工艺来合成 NCM523 材料。获得的化合物具有微纳米结构（由纳米片组成的微米尺寸的橄榄球颗粒）。尿素和 SDS 的使用在合成材料的形态和结构中起着至关重要的作用，已被系统研究。样品 U-4 表现出与设计的最接近的金属比例，并且其电化学性能优越。它在 100 次循环后保持 82.9% 的容量保持率（3.0-4.3 V，0.1 C，25 °C），并在 10C 下提供 112.4 mAh⋅g-1 的高倍率容量。这些卓越的性能归因于 NCM 523 的固有特性和微纳米形态的协同作用。