Enhanced Safety Performance of Automotive Lithium‐Ion Batteries with Al2O3‐Coated Non‐Woven Separator,Batteries & Supercaps

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Enhanced Safety Performance of Automotive Lithium‐Ion Batteries with Al2O3‐Coated Non‐Woven Separator
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-08-21 , DOI: 10.1002/batt.202000169
Fanhui Meng _{1,

2} , Jinhui Gao ₂ , Mengdi Zhang ₁ , Dongwei Li ₃ , Xizheng Liu ₁

Affiliation

Thermal runaway (TR) is the fatal safety defects that hinder the wide application of automotive batteries. The short circuit caused by shrinkage of separators under high temperatures leads to TR. In this paper, we demonstrate the robust thermal stability of an Al₂O₃ coated non‐woven polyethylene terephthalate (PET) separator. The shrinkage ratio of the Al₂O₃ coated separator has been compared with the non‐coated polyethylene (PE) separator by differential scanning calorimetry (DSC), thermogravimetry (TG ) and heat nail tests. Automotive lithium‐ion batteries (LIBs) with large capacities have been used to conduct the simulations of nail penetration. TR is found to be triggered by Joule heat generation during the shrinkage of the separators. The separator with lower shrinkage retains highly stable dimension against wide range temperature changes. This feature enables the Al₂O₃ coated separator to prevent inner short circuits. The improved safety performance indicates a promising prospect of Al₂O₃ coated non‐woven separators in LIBs.

中文翻译：

涂有Al2O3的无纺布隔膜增强了汽车锂离子电池的安全性能

热失控（TR）是致命的安全缺陷，阻碍了汽车电池的广泛应用。高温下隔板收缩引起的短路会导致TR。在本文中，我们证明了涂有Al ₂ O _3的非织造聚对苯二甲酸乙二酯（PET）隔离器具有强大的热稳定性。Al ₂ O ₃的收缩率通过差示扫描量热法（DSC），热重法（TG）和热钉试验，已将涂层隔离膜与非涂层聚乙烯（PE）隔离膜进行了比较。大容量的汽车锂离子电池（LIB）已用于进行钉子穿透的模拟。发现TR是由隔板收缩期间的焦耳热产生触发的。收缩率低的隔膜可在较大范围的温度变化下保持高度稳定的尺寸。此功能使涂有Al ₂ O _3的隔膜能够防止内部短路。安全性能的提高表明锂离子电池中涂有Al ₂ O _3的非织造隔板的前景广阔。

更新日期：2020-08-21

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