Investigation of the impact of different electrode inhomogeneities on the voltage response of Li-ion batteries

IF 7.9 2区 综合性期刊 Q1 CHEMISTRY, MULTIDISCIPLINARY
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Abstract

As commercial batteries and battery packs become larger and larger, one topic that is gaining interest is that of cell-to-cell variations and inhomogeneities. In this theoretical study, we use a degradation mode model along with a segmented cell approach to investigate the impact of different inhomogeneity modes on the performance of two typical Li-ion batteries. This unique approach shows that out of the nine considered modes (state of charge, rate, resistance, and capacity for each electrode as well as their offset), when at a mild level and randomly distributed, only three could affect performance, with two unlikely to happen in real cells because they would disappear during rest. Model results show that some of these inhomogeneities open the possibility of a snowball effect to induce local rate variations and lithiation inhomogeneities. Our study also shows that it is necessary to assess the level at which the paralleling occurs, electrode or full cell, as the model predicts an impact on how the current, and how much of it, is flowing within or in between the electrodes.

Abstract Image

不同电极不均匀性对锂离子电池电压响应影响的研究
随着商用电池和电池组的体积越来越大,电池单元之间的变化和不均匀性日益受到关注。在这项理论研究中,我们使用退化模式模型和分段电池方法来研究不同不均匀性模式对两种典型锂离子电池性能的影响。这种独特的方法表明,在所考虑的九种模式(每个电极的充电状态、速率、电阻和容量以及它们的偏移)中,当处于温和水平且随机分布时,只有三种模式会影响性能,其中两种在实际电池中不太可能发生,因为它们会在静止时消失。模型结果表明,其中一些不均匀性可能会产生雪球效应,诱发局部速率变化和锂化不均匀性。我们的研究还表明,有必要评估发生并联的层次,是电极还是整个细胞,因为模型预测会影响电流在电极内或电极间流动的方式和程度。
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来源期刊
Cell Reports Physical Science
Cell Reports Physical Science Energy-Energy (all)
CiteScore
11.40
自引率
2.20%
发文量
388
审稿时长
62 days
期刊介绍: Cell Reports Physical Science, a premium open-access journal from Cell Press, features high-quality, cutting-edge research spanning the physical sciences. It serves as an open forum fostering collaboration among physical scientists while championing open science principles. Published works must signify significant advancements in fundamental insight or technological applications within fields such as chemistry, physics, materials science, energy science, engineering, and related interdisciplinary studies. In addition to longer articles, the journal considers impactful short-form reports and short reviews covering recent literature in emerging fields. Continually adapting to the evolving open science landscape, the journal reviews its policies to align with community consensus and best practices.
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