Ouyang Lixia, Wu Zhaohui, Wang Jun, Qi Xiaopeng, Li Qiang, Wang Jiantao, Lu Shigang
National Power Battery Innovation Center, GRINM Group Co., Ltd. Beijing 100088 China
China Automotive Battery Research Institute Co., Ltd. Beijing 100088 China.
RSC Adv. 2020 May 20;10(33):19360-19370. doi: 10.1039/d0ra02651d.
The development of new materials and the understanding of the microstructure formation of electrodes have become increasingly important for improving Li-ion battery performance. In this study, we investigate the effect of solid content on the rheological properties of and the microstructures in the cathode slurry prepared from Ni-rich materials. With long-chain structures, PVDF molecules can change their configurations when they come into contact with the solid particles in slurries, and their bridging function can change with the solid content in the slurry. Below the optimum content, particle sedimentation easily takes place. Above the optimum content, excessive yield stress is created in the slurry, and this stress is not conducive to homogeneous distribution of the components. The rheological properties of the slurries vary greatly under different solid contents. We investigated the uniformity and stability of the slurry prepared from Ni-rich materials and found that the most suitable solid content of the slurry lies in the range from 63.9% to 66.3%. Our work might assist in the production of high-performance Li-ion batteries that are made using an electrode slurry.
新型材料的开发以及对电极微观结构形成的理解对于提高锂离子电池性能变得越来越重要。在本研究中，我们研究了固含量对由富镍材料制备的阴极浆料的流变性能和微观结构的影响。PVDF分子具有长链结构，当它们与浆料中的固体颗粒接触时会改变其构型，并且它们的桥接功能会随浆料中的固含量而变化。低于最佳含量时，颗粒容易发生沉降。高于最佳含量时，浆料中会产生过大的屈服应力，而这种应力不利于各组分的均匀分布。在不同固含量下，浆料的流变性能差异很大。我们研究了由富镍材料制备的浆料的均匀性和稳定性，发现浆料最合适的固含量范围为63.9%至66.3%。我们的工作可能有助于使用电极浆料生产高性能锂离子电池。
