Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.246
Publication date: 18th December 2023
In the current growth of the electric vehicle (EV) market, the roll-to-roll dry coating process, enabling mass production of high-thick electrode (≥10mAh cm-2), stands out as an innovative and practical approach to fabricate the low-cost and high-energy-density Li-ion batteries (LIBs). However, as the thickness of the electrode fabricated by dry coating process becomes greater (≥10 mAh cm-2), Li-ion migration resistance (Rion) and charge-transfer resistance (Rct) in the electrode dramatically increase due to long diffusion lengths for Li-ion and electron. This is primarily associated with the non-uniform distribution of electrode components and severe fractures of cathode active material during the dry coating process. Therefore, it is crucial to reduce diffusion lengths in the thick electrode to achieve high energy density LIBs. In this study, we identified the factors associated with the increase in ionic resistance through electrochemical analysis. Then, manipulation of material and process parameters was conducted to optimize the microstructure of the dry electrode. Finally, we successfully developed a 10mAh cm-2 dry electrode with low ionic resistances, exhibiting the enhanced of Li+/e- kinetics and improved high C-rate capability.
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