| 江斌,孔祥景,施伟,田昊,郭战胜*.锂离子电池隔膜的力学性能测量[J].实验力学,2023,38(6):712~722 |
| 锂离子电池隔膜的力学性能测量 |
| Mechanical properties of separator for lithium ion batteries |
| 投稿时间：2023-01-04 修订日期：2023-05-01 |
| DOI：10.7520/1001-4888-23-004 |
| 中文关键词: 锂离子电池 隔膜 弹性模量 强度 泊松比 数字图像相关 |
| 英文关键词:lithium ion batteries separators elastic modulus ultimate strength Poisson's ratio DIC test system |
| 基金项目:国家自然科学基金项目(11972218和12172206) |
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| 中文摘要: |
| 隔膜是锂离子电池的重要组成部分，其力学性能的综合表现是保证电池电化学性能的关键因素。本文通过单向拉伸实验和数字图像相关(DIC)技术来研究表面涂敷聚偏二氟乙烯的聚乙烯隔膜的基本力学性能；结合工程应力-应变曲线，分别确定了隔膜横轴(TD)和纵轴(MD)方向在不同拉伸速率下的弹性模量和强度；利用DIC技术得到的应变-时间曲线，确定了隔膜TD和MD方向的泊松比。单向拉伸实验表明，隔膜TD和MD方向的弹性模量和极限强度值都与测试方向无关，且拉伸速率越快，弹性模量越大，但极限强度值基本不变。DIC测试结果表明，隔膜TD和MD方向的泊松比也相等。研究发现，与很多已有隔膜具有明显各向异性性质不同，测试隔膜不但具有较高的弹性模量和极限强度，而且具有明显的各向同性性质。 |
| 英文摘要: |
| The separator is an important component of lithium ion batteries, and the comprehensive performance of its mechanical properties is an important key factor in ensuring the electrochemical performance of the battery. In this work,the basic mechanical properties of polyethylene separator coated with polyvinylidene fluoride was investigated through uniaxial tensile experiments and digital image correlation (DIC) technology. Based on the engineering stress-strain curve, the elastic modulus and strength of the separator in transverse direction (TD) and transverse direction (TD) directions were determined at different tensile rates. The Poisson's ratios in the TD and MD directions of the separator were determined using the strain-time curve obtained by DIC technology.The uniaxial tension test shows that the elastic modulus and ultimate strength of TD and MD are independent of the test direction, and the faster the tensile rate, the greater the elastic modulus but the ultimate strength is basically unchanged. DIC test results showed that the TD and MD directions of the separator were almost equal. It is found that different from many existing separators which have obvious anisotropic properties, the tested separator not only have high elastic modulus and ultimate strength, but also have obvious isotropic properties. |
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