膜
电解质
分离器(采油)
多孔性
化学工程
溶解
溶剂
材料科学
极化(电化学)
离子电导率
热稳定性
化学
纳米技术
电极
高分子化学
有机化学
复合材料
物理化学
生物化学
物理
工程类
热力学
作者
Yonggui Deng,Arshad Hussain,Waseem Raza,Lihong Ao,Kai Zong,Jie Zhao,Wei Liu,Pengfei Ye,Aymeric Ramière,Xingke Cai,Dongqing Liu,Jun Shen
标识
DOI:10.1016/j.cej.2023.145800
摘要
A series of Polybenzimidazole (PBI) membranes with tunable porous structure were prepared using the classical non-solvent induced phase separation method by adjusting the proportions of non-solvent H2O/EtOH. With the increase of ethanol concentration, the PBI membrane gradually change from the asymmetric finger-like structure to the highly interconnected spongy porous architecture (PBI-E70 and PBI-E100). Moreover, the as-prepared PBI membranes, especially for the PBI-E70 sample, display better electrolyte affinity, ionic conductivity, thermal stability, and mechanical strength than the PP separator. As expected, the Li//Li symmetric cell using PBI-E70 exhibits longer life span (500 h) with lower polarization values (13 mV) than other PBI or PP cells; the PBI-E70 based Li//LiFePO4 cell shows superior cyclic stability (0.5 C) and rate capability than the other cells. The highly improved cell performance of the PBI-E70 is not only attributed to its chemistry multifunctionality, but also its interconnected sponge network to facilitate ordered ion transportation and guide uniform lithium deposition/dissolution, which has been verified by the COMSOL simulation. This study provides a simple and cost-effective method to prepare membrane with tunable morphology as well as its superb performance for Li metal battery.
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