Separator Aging and Performance Degradation Caused by Battery Expansion: Cyclic Compression Test Simulation of Polypropylene Separator
Separator Aging and Performance Degradation Caused by Battery Expansion: Cyclic Compression Test Simulation of Polypropylene Separator
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电池膨胀引起的隔膜老化和性能下降：聚丙烯隔膜的循环压缩测试模拟
DOI：
10.1149/1945-7111/abe724
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发表时间：
2021-02
影响因子：
3.9
通讯作者：
Lei Caihong
中科院分区：
文献类型：
--
作者：
Yuan Zidan;Xue Nanxiang;Xie Jiayi;Xu Ruijie;Lei Caihong
聚烯烃隔膜在其使用寿命期间的结构变化极大地影响锂离子电池的工作效率和安全性。研究人员对使用周期内隔膜的结构变化与电池性能老化之间的关系知之甚少。因此，我们设计了一种可以模拟电池中隔板环境的装置，以跟踪周期性变形过程中隔板结构的演变。在这项工作中，选择聚丙烯隔膜，并在不同压缩应变7.5%、12.5%和15%下进行碳酸二甲酯饱和的1、50和100次循环压缩试验。随着应变的增加，隔膜表面呈现出不同程度的透明皱纹，并且阻抗更高。离子电导率变低。 DMC-12.5%的放电容量下降32.2%，DMC-15%的放电容量下降46.3%。 DMC-15%充放电电压平台明显降低。分离器中透明皱纹周围的片层骨架的损坏程度随着循环次数和压缩应变的增加而增加。沿横向方向，一些孔隙被压缩甚至关闭，导致隔膜表面出现透明皱纹，导致电化学性能变差。
The structural changes of polyolefin separator during its service life greatly affect the working efficiency and safety of the lithium-ion battery. Researchers have known little about the relationship between the structural change of the separator and battery performance aging during the service cycle. Therefore, we design one device that could simulate the separator environment in the battery to track the separator structure evolution during the periodic deformation process. In this work, the polypropylene separator is chosen and 1-, 50-and 100-cycle compression tests are carried out saturated with dimethly carbonate at different compression strain 7.5%, 12.5% and 15%. The separators show different degree of transparent wrinkles on the surface and higher impedance as the strain increases. The ionic conductivity becomes lower. The discharge capacity declines by 32.2% in DMC-12.5% and by 46.3% in DMC-15%. The voltage platform of charge and discharge in DMC-15% reduce obviously. The damaged degree of lamellae skeleton around the transparent wrinkles in the separator is increased with the cycle times and compression strain. Along the transverse direction, some pores are compressed and even closed, leading to the appearance of transparent wrinkles on the separator surface and resulting in the worse electrochemical performance.
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DOI：
10.1016/j.ijsolstr.2018.02.005
发表时间：
2018-05
影响因子：
3.6
作者：
Juner Zhu;Xiaowei Zhang;T. Wierzbicki
通讯作者：
Juner Zhu;Xiaowei Zhang;T. Wierzbicki
影响因子：
9.2
作者：
Xu, Hongyi;Usseglio-Viretta, Francois;Finegan, Donal P.
通讯作者：
Finegan, Donal P.
影响因子：
9.2
作者：
Gor, Gennady Y.;Cannarella, John;Arnold, Craig B.
通讯作者：
Arnold, Craig B.
影响因子：
4.6
作者：
Zhang X;Sahraei E;Wang K
通讯作者：
Wang K
影响因子：
3.9
作者：
Jianchao Chen;Yongda Yan;T. Sun;Y. Qi;Xiaodong Li
通讯作者：
Jianchao Chen;Yongda Yan;T. Sun;Y. Qi;Xiaodong Li