纳米纤维
聚酰亚胺
材料科学
膜
分离器(采油)
电化学
化学工程
酰亚胺
复合材料
高分子化学
电极
图层(电子)
化学
物理化学
生物化学
热力学
物理
工程类
作者
Guohua Sun,Xixi Feng,Xin Zhang,Pengpeng Li,Lianlong Hou,Shengli Qi,Hong Zhu
标识
DOI:10.1016/j.memsci.2024.122549
摘要
Highly robust nanofibrous separators can effectively promote the battery's electrochemical performance and security. Here, we present a synergistically reinforced polyimide (PI) nanofiber membrane by tuning the regularity of PI chains while employing an in-situ PI reinforcement. The regularity of nanofibers and ordered region of PI chains is improved after hot stretching, thus enhancing the mechanical strength of PI nanofibers membrane. After synergistic PI-armor reinforcement, the reinforced PI nanofiber membrane with excellent thermotolerance and flame resistance exhibits a remarkable mechanical strength of 120.9 MPa, making them among the most robust PI nanofiber separators reported to date. Density functional theory calculations verify that the electron-rich sites of imide group in PI main chain can facilitate the desolvation of lithium-ion (Li+) and adsorb Li+ near imide groups of PI. Hence, the reinforced PI nanofiber separator with abundant 3D uniform nano-pore structure displays high ion conductivity (1.10 mS cm−1) and Li+ transfer number (0.58). Besides, Li symmetrical battery using the reinforced PI nanofiber membrane exhibits only a tiny voltage polarization during 300 h at 1.0 mA cm−2. These exceptional merits offer excellent specific capability (128.1 mA h g−1 at 5 C) to reinforced PI nanofiber membrane-based LIBs, along with 100-cycle battery stability at 1 C without significant capacity decay.
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