Hierarchical Polyamide 6 (PA6) Nanofibrous Membrane with Desired Thickness as Separator for High-Performance Lithium-Ion Batteries
Hierarchical Polyamide 6 (PA6) Nanofibrous Membrane with Desired Thickness as Separator for High-Performance Lithium-Ion Batteries
复制标题
具有所需厚度的分层聚酰胺 6 (PA6) 纳米纤维膜作为高性能锂离子电池的隔膜
DOI：
10.1149/2.0971707jes
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发表时间：
2017-01-01
影响因子：
3.9
通讯作者：
Wang, Dong
中科院分区：
文献类型：
--
作者：
Chen, Jiahui;Liu, Qiongzhen;Wang, Dong
聚合物纳米纤维隔膜由于其独特的曲折孔用于防止锂枝晶的生长并因此确保高安全性和循环稳定性而引起了极大的关注。具有强机械强度的各种非织造垫通常用作纳米纤维膜的基底材料。然而，大多数纳米纤维隔膜的总厚度（> 40 μ m）远远超过理想尺寸（25 μ m类似于30 μ m），从而严重降低了电池的能量密度。在目前的工作中，一个分层结构的聚酰胺6（PA 6）纳米纤维隔板（指定为PA 6/PET/PA 6）与所需的厚度为30 μ m已成功地开发使用超薄聚（对苯二甲酸乙二醇酯）（PET）非织造布（18 μ m）作为基板。由于PET非织造布的平坦性和疏水性，人们尝试通过NaOH溶液处理来提高PET与PA 6膜之间的粘合力。与普通PP隔膜相比，PA 6/PET/PA 6隔膜具有更低的热收缩率、更高的电解质亲和性和离子电导率，以及更好的上级倍率性能和循环性能，有望应用于高倍率LIB。(C)2017年电化学学会。All rights reserved.
Polymeric nanofibrous separators have drawn a great attention due to their unique tortuous pores for preventing the growth of lithium dendrites and hence ensuing high safety and cycling stability. Various nonwoven mats with strong mechanical strength are typically served as substrate materials for nanofibrous membranes. However, the overall thickness (> 40 mu m) of most nanofibrous separator is far beyond the ideal dimension (25 similar to 30 mu m), thus severely reducing the energy densities of batteries. In present work, a hierarchically structured polyamide 6 (PA6) nanofibrous separator (designated as PA6/PET/PA6) with a desired thickness of 30 mu m has been successfully developed using an ultra-thin poly (ethylene terephthalate) (PET) nonwoven (18 mu m) as the substrate. Due to the flatness and hydrophobic nature, surface modifications of PET nonwoven have been attempted to improve the adhesion force between PET and PA6 membranes by NaOH solution treatment. The resultant PA6/PET/PA6 separator exhibits lower thermal shrinkage, higher electrolyte affinity and ionic conductivity, as well as superior rate capabilities and cycling performance compared with commercial PP separator, suggesting a promising candidate for practical application in high-rate LIBs. (C) 2017 The Electrochemical Society. All rights reserved.