A Model for the Behavior of Battery Separators in Compression at Different Strain/Charge Rates
A Model for the Behavior of Battery Separators in Compression at Different Strain/Charge Rates
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DOI：
10.1149/2.0111411jes
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发表时间：
2014-01-01
影响因子：
3.9
通讯作者：
Arnold, Craig B.
中科院分区：
文献类型：
--
作者：
Gor, Gennady Y.;Cannarella, John;Arnold, Craig B.
在锂电池的充放电过程中，锂离子嵌入电极会引起电极的显著膨胀，压缩电极之间的软隔膜。为了评估这些影响对电池性能的影响，有必要了解电池隔板在压缩载荷下的响应。在这里，我们开发了一个模型，用于预测浸入流体中的商业分离器在不同应变率下对压缩的弹性响应。我们发现，由于流体在孔隙中的流动，分离器的响应是由聚合物骨架的粘弹性行为和孔隙弹性行为的组合决定的。孔隙弹性行为导致隔板的有效硬化，并随着应变率的增加而增加。对于直径约1厘米的样品，当应变速率大于或接近10(-3)S(-1)时，这些效应变得明显，并且必须在锂离子电池的机械-电化学耦合模型中考虑。(C)提交人(S)2014年。由ECS出版。这是一篇开放获取文章，根据知识共享署名4.0许可证(CC by，http://creativecommons.org/licenses/by/4.0/)，)的条款分发，该许可证允许在任何介质中不受限制地重复使用作品，前提是正确引用原始作品。版权所有。
During charge and discharge of a lithium battery, intercalation of lithium ions into the electrodes can cause their noticeable expansion, compressing the soft separator between them. To assess the role of these effects on the battery performance, it is necessary to know the response of the battery separator under compressive loading. Here we develop a model for predicting the elastic response of a commercial separator immersed in fluid to compression at different strain rates. We show that the response of the separator is determined by combination of viscoelastic behavior of the polymer skeleton and poroelastic behavior, due to the flow of the fluid in the pores. Poroelastic behavior causes effective stiffening of the separator, which increases with the strain rate. For a sample of ca. 1 cm in diameter these effects become pronounced at strain rates greater than or similar to 10(-3) s(-1) and have to be taken into account in coupled mechano-electrochemical models for lithium-ion batteries. (C) The Author(s) 2014. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. All rights reserved.