Analysis of Differences in Electrochemical Performance Between Coin and Pouch Cells for Lithium-Ion Battery Applications,Energy & Environmental Materials

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Analysis of Differences in Electrochemical Performance Between Coin and Pouch Cells for Lithium-Ion Battery Applications
Energy & Environmental Materials ( IF 13.0 ) Pub Date : 2023-03-16 , DOI: 10.1002/eem2.12615
Yeonguk Son _{1,

2} , Hyungyeon Cha ₃ , Taeyong Lee ₃ , Yujin Kim ₃ , Adam Boies ₁ , Jaephil Cho ₃ , Michael De Volder ₁

Affiliation

Small coin cell batteries are predominantly used for testing lithium-ion batteries (LIBs) in academia because they require small amounts of material and are easy to assemble. However, insufficient attention is given to difference in cell performance that arises from the differences in format between coin cells used by academic researchers and pouch or cylindrical cells which are used in industry. In this article, we compare coin cells and pouch cells of different size with exactly the same electrode materials, electrolyte, and electrochemical conditions. We show the battery impedance changes substantially depending on the cell format using techniques including Electrochemical Impedance Spectroscopy (EIS) and Galvanostatic Intermittent Titration Technique (GITT). Using full cell NCA-graphite LIBs, we demonstrate that this difference in impedance has important knock-on effects on the battery rate performance due to ohmic polarization and the battery life time due to Li metal plating on the anode. We hope this work will help researchers getting a better idea of how small coin cell formats impact the cell performance and help predicting improvements that can be achieved by implementing larger cell formats.

中文翻译：

锂离子电池应用中纽扣电池和软包电池电化学性能差异分析

小型纽扣电池主要用于学术界测试锂离子电池 (LIB)，因为它们需要少量材料且易于组装。然而，学术研究人员使用的纽扣电池与工业中使用的软包或圆柱形电池之间的格式差异所引起的电池性能差异却没有引起足够的重视。在本文中，我们比较了电极材料、电解质和电化学条件完全相同的不同尺寸的纽扣电池和软包电池。我们使用电化学阻抗谱 (EIS) 和恒电流间歇滴定技术 (GITT) 等技术，展示了电池阻抗的显着变化，具体取决于电池格式。使用全电池NCA-石墨LIB，我们证明这种阻抗差异对由于欧姆极化而导致的电池倍率性能以及由于阳极上的锂金属镀层而导致的电池寿命具有重要的连锁效应。我们希望这项工作将帮助研究人员更好地了解小型纽扣电池格式如何影响电池性能，并帮助预测通过实施更大的电池格式可以实现的改进。

更新日期：2023-03-16

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