在单轴和双轴负载条件下离子电池分离器的机械行为
Sahand Shamchi1, Behzad V Farahani2, Marian Bulla1,3
1Institute of Mechanics and Materials, Technische Hochschule Mittelhessen, Wiesenstr. 14, 35390 Giessen, Germany.
Polymers
|April 27, 2024
概括
研究了离子电池分离器的机械完整性. 陶涂层降低了强度和伸展性,影响了压力下的分离器性能.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 电化学 电化学 电化学
背景情况:
- 离子电池 (LIB) 在安全性和性能方面依赖分离器.
- 了解在运行压力下分离器的机械完整性对于电池设计至关重要.
- 商用分离器,如Celgard三层薄膜,需要详细的机械表征.
研究的目的:
- 在单轴和双轴负载下调查两个商业离子电池分离器的机械完整性.
- 为了比较标准三层分离器与陶涂层变体的性能.
- 开发和验证用于预测分离器行为的有限元模型.
主要方法:
- 沿机器,横向和对角方向进行单轴拉伸测试.
- 气动膨胀测试用于平面内双轴张力,避免摩擦效应.
- 3D数字图像相关性 (DIC) 和潘金宁-克鲁格洛夫方法用于双轴应力-张力分析.
- 使用OpenRadioss开发一个经过实验校准的有限元模型.
主要成果:
- 两个分离器都表现出明显的平面内异构性.
- 陶涂层对机械性能产生了负面影响,降低了强度和伸展性.
- 有限元素模型准确地预测了双轴变形直到故障,与实验数据相对应得很好.
结论:
- 聚烯/聚乙烯/聚烯分离器上的陶涂层可能会损害机械完整性.
- 不同类型的行为是这些分离器在负载下的主要特征.
- 经过验证的有限元模型是预测离子电池分离器机械响应的有效工具.
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