Analysis of the limitation factors of thick cathodes based on experimental and P2D model simulations

Bin Qi, Zhiyuan Li, Lei Song, Guanwen Wang, Tong Wei
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引用次数: 0

Abstract

The thickness of the electrode significantly impacts battery performance. Increasing electrode thickness contributes to higher energy density, but it also leads to a decline in rate capability and stability. Therefore, a balance must be struck when determining electrode thickness. In this context, we compare experimental results with numerical simulations to reveal the primary reasons behind the drastic reduction in battery capacity and rate performance due to excessively thick electrodes. At the same time, there is minimal difference between experimental and simulated results at lower electrode thicknesses and smaller currents. As the electrode thickness and current increase, experimental performance deteriorates more rapidly, which arises from the uneven distribution of various components within the cathode during the drying process. In addition, we also simulated the capacity of the crack-free electrode and the depth of discharge at various locations within it, thus determining the main factors of its capacity decline.
基于实验和 P2D 模型模拟的厚阴极限制因素分析
电极的厚度对电池性能有重大影响。增加电极厚度有助于提高能量密度,但同时也会导致速率能力和稳定性下降。因此,在确定电极厚度时必须取得平衡。在此背景下,我们将实验结果与数值模拟结果进行了比较,以揭示电极过厚导致电池容量和速率性能急剧下降的主要原因。同时,在电极厚度较小、电流较小时,实验结果与模拟结果的差异很小。随着电极厚度和电流的增加,实验结果会迅速恶化,这是由于阴极在干燥过程中各种成分分布不均造成的。此外,我们还模拟了无裂纹电极的容量及其内部不同位置的放电深度,从而确定了其容量下降的主要因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
1.20
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