A novel core-shell structured poly-m-phenyleneisophthalamide@polyvinylidene fluoride nanofiber membrane for lithium ion batteries with high-safety and stable electrochemical performance
A novel core-shell structured poly-m-phenyleneisophthalamide@polyvinylidene fluoride nanofiber membrane for lithium ion batteries with high-safety and stable electrochemical performance
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一种新型核壳结构聚间苯二甲酰间苯二胺@聚偏二氟乙烯纳米纤维膜，具有高安全性和稳定的电化学性能，用于锂离子电池
DOI：
10.1016/j.electacta.2019.01.115
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发表时间：
2019-03
影响因子：
6.6
通讯作者：
Kang Weimin
中科院分区：
文献类型：
--
作者：
Wang Liyuan;Deng Nanping;Ju Jingge;Wang Gang;Cheng Bowen;Kang Weimin
在这项研究中，通过简便的同轴静电纺丝成功合成了一种新型核壳结构的聚间苯二甲酰间苯二胺@聚偏二氟乙烯（PMIA@PVDF）纳米纤维隔膜。纳米纤维隔膜的热阻、电解液吸收率、离子电导率以及阳极稳定性窗口同步提高到260°C、753%、1.7mScm−1和5.0V以上，从而具有良好的安全性和电化学性能。性能的显着增强可归因于均质PMIA@PVDF纳米纤维隔膜中PMIA核和PVDF壳的协同优势。 PMIA@PVDF纳米纤维中的PMIA核具有高熔点和刚性特性，作为稳定的骨架，增强了整个隔膜的热稳定性和完整性。同时，亲液性的PVDF壳层以及静电纺丝膜相互连通的开孔结构保证了膜对电解质的润湿性，从而保证了离子传导。最令人印象深刻的是，在180°C以上的高温处理下，PVDF壳可以熔化并完全堵塞PMIA@PVDF纳米纤维隔膜中的大孔，从而关闭电池运行而没有明显的尺寸收缩。因此，电化学性能和安全性的优越性使得PMIA@PVDF纳米纤维隔膜成为高性能锂离子电池隔膜的优质材料。
In this study, a novel core-shell structured poly-m-phenyleneisophthalamide@polyvinylidene fluoride (PMIA@PVDF) nanofiber separator was successfully synthesized via facile coaxial electrospinning. The thermal resistance, electrolyte uptake, ion conductivity as well as anodic stability window of the nanofiber separator were synchronously improved to above 260 °C, 753%, 1.7 mS cm−1and 5.0 V, which resulted in an appealing safety and electrochemical performance. The markedly enhanced performance could be ascribed to the synergistic advantages of the PMIA core and PVDF shell in the homogeneous PMIA@PVDF nanofiber separator. The PMIA core in PMIA@PVDF nanofiber with high melting point and rigidity character acting as stable skeleton strengthened the thermal stability and integrity of the whole separator. Meanwhile, the lyophilic PVDF shell along with the interconnected open pore structure of electrospinning membrane guaranteed the membrane wettability to electrolyte so as to the ion conduction. Most impressively, under high temperature treatments above 180 °C, the PVDF shell could melt and completely occlude the macropores in PMIA@PVDF nanofiber separator to shut down the battery operation without obvious dimensional shrinkage. Thus, the superiorities in electrochemical performance and safety made PMIA@PVDF nanofiber separator a highly qualified separator for high performance lithium ion battery.
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