On the strain rate-dependent mechanical behavior of PE separator for lithium-ion batteries

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
Honggang Li , Jiahui Gu , Yongjun Pan , Binghe Liu , Chao Zhang
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Abstract

The separator is a critical component for ensuring electrochemical cycling performance and preventing internal short circuits in lithium-ion batteries. For the collision safety of lithium-ion batteries, understanding the rate-dependent mechanical behavior of the separator is essential for battery impact modeling and safety prediction. This study conducts a comprehensive experimental investigation into the strain rate–dependent tensile/compressive behavior and failure mechanism of the polyethylene (PE) separator under quasi-static and dynamic conditions. The combination of deformation images recorded by cameras and post-mortem characterization using SEM was employed to clarify the rate-dependent deformation and fracture mechanism of the separator under both tensile and compressive loading. The experimental results demonstrate a significant strain rate effect on the tensile/compressive mechanical properties and damage/failure behavior of the separator. Furthermore, the effect of the strain rate on the mechanical properties, including the tensile strength, tensile fracture strain, tensile elastic modulus, compressive modulus, yield stress and yield strain of separator, was analyzed and discussed. A significant strain rate-dependent tensile damage and fracture behavior of the separator was observed, where the fracture site exhibited an obvious phase transition and skeletal lamella fracture under extremely high strain rate tensile loading. The separator underwent severe damage under dynamic compressive conditions. The results of this study provide an important basis for the establishment of rate-dependent safety criterion and short circuit prediction of lithium-ion batteries under impact loading, and shed light on understanding separator failure-induced short circuit issues in battery collision safety scenarios.

Abstract Image

锂离子电池聚乙烯隔膜随应变速率变化的力学行为
隔膜是确保锂离子电池电化学循环性能和防止内部短路的关键部件。为了确保锂离子电池的碰撞安全,了解隔膜随速率变化的机械行为对于电池碰撞建模和安全预测至关重要。本研究对聚乙烯(PE)隔膜在准静态和动态条件下随应变速率变化的拉伸/压缩行为和破坏机制进行了全面的实验研究。结合使用摄像机记录的变形图像和使用扫描电子显微镜进行的死后表征,阐明了聚乙烯(PE)隔板在拉伸和压缩载荷下随应变速率变化的变形和断裂机制。实验结果表明,应变速率对分离器的拉伸/压缩机械性能和损坏/断裂行为有显著影响。此外,还分析和讨论了应变率对力学性能的影响,包括分离器的拉伸强度、拉伸断裂应变、拉伸弹性模量、压缩模量、屈服应力和屈服应变。观察到分离器的拉伸损伤和断裂行为明显依赖于应变率,在极高应变率拉伸加载下,断裂部位出现明显的相变和骨架薄片断裂。在动态压缩条件下,分离器发生了严重破坏。该研究结果为建立锂离子电池在冲击载荷下的速率相关安全标准和短路预测提供了重要依据,并有助于理解电池碰撞安全场景中隔膜失效引发的短路问题。
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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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