The study about regulation mechanism on the microstructure of Ni-rich precursors still lags behind, and its influencing mechanism on the electrochemical performance for the cathode materials is still unclear. Herein, the batch coprecipitation method was used to control the sulfate supply flow to prepare precursors with different surface primary particle morphologies and internal pores. It was found that the larger the sulfate supply flow per unit time, the longer the primary particles of the precursors. Moreover, the agglomeration rate of primary particles and the growth rate of the secondary particle size were faster. The loose porous structure was easy to appear in the precursors. The cathode materials inherited the porous structure of precursors and displayed better discharge capacity and rate performance. This study provides insights for regulating the precursor structure of the Ni-rich cathode materials and reveals the attenuation mechanisms of capacity and cycle performance on the cathode materials.

中文翻译：

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深入了解富镍 LiNi0.9Co0.05Mn0.05O2 正极材料前驱体的孔隙率和径向结构


关于富镍前驱体微观结构的调控机制的研究仍然滞后，其对正极材料电化学性能的影响机制仍不清楚。本文采用间歇共沉淀法控制硫酸盐供应流，制备具有不同表面初级颗粒形态和内部孔隙的前驱体。研究发现，每单位时间内硫酸盐供应流量越大，前驱体的初级颗粒越长。此外，初级颗粒的团聚速率和次级颗粒尺寸的生长速率更快。松散的多孔结构很容易出现在前驱体中。正极材料继承了前驱体的多孔结构，表现出更好的放电容量和倍率性能。本研究为调控富镍正极材料的前驱体结构提供了见解，并揭示了容量和循环性能对正极材料的衰减机制。