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Core–Shell Structured Nanofibers for Lithium Ion Battery Separator with Wide Shutdown Temperature Window and Stable Electrochemical Performance
ACS Applied Polymer Materials ( IF 5 ) Pub Date : 2020-03-31 , DOI: 10.1021/acsapm.0c00164
Zhenzhen Wei 1 , Jiayi Gu 1 , Fengrui Zhang 2 , Zhijuan Pan 1 , Yan Zhao 1
Affiliation  

Endowing separators in lithium ion batteries with highly sensitive shutdown function and good thermal stability is critical for the large-scale energy storage application of lithium ion batteries. In this work, a thermally induced shutdown separator with high thermal sensitivity and stability has been successfully fabricated via coaxial electrospinning of polyacrylonitrile (core) and poly(butylene succinate) (shell) (PAN@PBS). The separator is composed of core–shell structured and intersected nanofibers, which brings about the high porosity, excellent electrolyte wettability, and desirable electrolyte uptake. Meanwhile, the coaxial nanofibrous separator exhibits prompt shutdown response at 110 °C and remains structural integrity at 250 °C, indicating the coexisting characteristics of high thermal sensitivity and high thermal stability. Moreover, compared with the Celgard separator, the coaxial nanofibrous separator displays stable electrochemical properties in terms of higher ionic conductivity (2.1 mS cm–1) and superior cycling stability with capacity retention of 93.2% after 100 cycles at a 1 C rate and higher rate capability. Considering the high safety and good electrochemical performance, the as-prepared PAN@PBS nanofibrous membrane is a promising separator candidate for lithium ion batteries with enhanced safety.

中文翻译:

核壳结构纳米纤维用于锂离子电池隔膜,具有宽关闭温度范围和稳定的电化学性能

赋予锂离子电池隔膜高度灵敏的关闭功能和良好的热稳定性,对于锂离子电池的大规模储能应用至关重要。在这项工作中,已经成功地通过同轴电纺聚丙烯腈(核)和聚丁二酸丁二酸酯(壳)(PAN @ PBS)成功地制造了具有高热敏性和稳定性的热感应停机隔板。隔膜由核-壳结构和相交的纳米纤维组成,具有高孔隙率,优异的电解质润湿性和理想的电解质吸收能力。同时,同轴纳米纤维隔板在110°C时表现出迅速的关闭响应,并在250°C时保持结构完整性,这表明高热敏性和高热稳定性并存。此外,–1)和卓越的循环稳定性,在1 C速率和更高倍率能力下进行100次循环后,容量保持率为93.2%。考虑到高安全性和良好的电化学性能,所制备的PAN @ PBS纳米纤维膜是具有增强的安全性的锂离子电池的有前途的候选隔膜。
更新日期:2020-03-31
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