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首页> 外文期刊>International Journal of Electrochemical Science >CePO4 Coated LiNi0.6Co0.2Mn0.2O2 as Cathode Material and its Electrochemical Performance
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CePO4 Coated LiNi0.6Co0.2Mn0.2O2 as Cathode Material and its Electrochemical Performance

机译：CePO 4 包覆的LiNi 0.6 Co 0.2 Mn 0.2 O 2 作为阴极材料其电化学性能

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摘要

A facile hydrothermal method is successfully developed for the synthesis of CePO 4 coatedLiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM 622) cathodes. The as-prepared samples are characterized by X-raydiffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM),electrochemical workstation, electrochemical impedance spectroscopy (EIS) and inductively coupledplasma emission spectrometry (ICP). Compared to the pristine NCM 622 cathode, the rate capacity andcyclic performance are significantly improved after coating. Even under a 10 C charge/discharge rate,the initial discharge capacity of the 3.0-NCM sample is up to 95.2 mAh·g ?1 . Furthermore, the as-prepared 3.0-NCM sample exhibits excellent cyclic performance with 96.8% capacity retention at 1 Cunder 55 o C after 100 cycles, while the pure NCM 622 only delivers poor capacity retention of 71.4%.The above conclusions can be characterized that CePO4 coating layer can effectively avert the secondaryreaction between electrolyte and cathode material. In addition, the CePO 4 coating layer can significantlysuppress the dissolution of cathodes in the electrolyte, which contributes to the excellent rateperformance and cycle stability.
机译：成功开发了一种简便的水热方法，用于合成CePO 4包覆的LiNi 0.6 Co 0.2 Mn 0.2 O 2（NCM 622）阴极。所制备的样品通过X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM），电化学工作站，电化学阻抗谱（EIS）和电感耦合等离子体发射光谱（ICP）进行表征。与原始的NCM 622阴极相比，涂覆后的倍率容量和循环性能显着提高。即使在10 C的充放电速率下，该3.0-NCM样品的初始放电容量也高达95.2 mAh·g？1。此外，制备的3.0-NCM样品表现出出色的循环性能，在100循环下于55°C下在1 C下的容量保持率为96.8％，而纯NCM 622仅提供了71.4％的较差的容量保持率。 CePO4涂层可以有效避免电解质和阴极材料之间的二次反应。另外，CePO 4涂层可以显着抑制阴极在电解质中的溶解，这有助于优异的倍率性能和循环稳定性。

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