Song Zelai, Zhu Penghui, Pfleging Wilhelm, Sun Jiyu
Institute for Applied Materials-Applied Materials Physics (IAM-AWP), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
Key Laboratory of Bionic Engineering (Ministry of Education, China), Jilin University, Changchun 130022, China.
Nanomaterials (Basel). 2021 Nov 4;11(11):2962. doi: 10.3390/nano11112962.
The electrochemical performance of lithium-ion batteries is directly influenced by type of active material as well as its morphology. In order to evaluate the impact of particle morphology in thick-film electrodes, Li(NiMnCo)O (NMC 622) cathodes with bilayer structure consisting of two different particle sizes were manufactured and electrochemically characterized in coin cells design. The hierarchical thick-film electrodes were generated by multiple casting using NMC 622 (TA) with small particle size of 6.7 µm and NMC 622 (BA) with large particle size of 12.8 µm. Besides, reference electrodes with one type of active material as well as with two type of materials established during mixing process (BT) were manufactured. The total film thickness of all hierarchical composite electrodes were kept constant at 150 µm, while the thicknesses of TA and BA were set at 1:2, 1:1, and 2:1. Meanwhile, three kinds of thin-film cathodes with 70 µm were applied to represent the state-of-the-art approach. Subsequently, ultrafast laser ablation was applied to generate groove structures inside the electrodes. The results demonstrate that cells with thin-film or thick-film cathode only containing TA, cells with bilayer electrode containing TBA 1:2, and cells with laser-structured electrodes show higher capacity at C/2 to 5C, respectively.
锂离子电池的电化学性能直接受到活性材料类型及其形态的影响。为了评估颗粒形态对厚膜电极的影响，制备了具有由两种不同粒径组成的双层结构的Li(NiMnCo)O（NMC 622）阴极，并在硬币电池设计中对其进行了电化学表征。通过多次浇铸使用粒径为6.7 µm的小粒径NMC 622（TA）和粒径为12.8 µm的大粒径NMC 622（BA）生成分层厚膜电极。此外，还制备了具有一种活性材料以及在混合过程中形成的两种材料（BT）的参比电极。所有分层复合电极的总膜厚保持恒定在150 µm，而TA和BA的厚度设置为1:2、1:1和2:1。同时，应用三种70 µm的薄膜阴极来代表当前的先进方法。随后，采用超快激光烧蚀在电极内部生成沟槽结构。结果表明，仅包含TA的薄膜或厚膜阴极的电池、包含1:2的TBA的双层电极的电池以及具有激光结构化电极的电池在C/2至5C下分别显示出更高的容量。
