分离器(采油)
材料科学
聚酰亚胺
纳米纤维
热稳定性
电解质
聚烯烃
膜
静电纺丝
化学工程
润湿
复合材料
聚合物
化学
图层(电子)
电极
物理
工程类
物理化学
热力学
生物化学
作者
Ying Wang,Haihui Wang,Junqi Fang,Liang‐Xin Ding
标识
DOI:10.1016/j.memsci.2017.05.023
摘要
The commercial polyolefin separators still possess two well-known drawbacks: poor wettability and thermal stability. Herein, a thin and lightweight silica filled in polyimide (PI) nanofibers membrane is prepared by electrospinning. Without any binders, the nano-silica particles are firmly embedded in the PI nanofibers with high structure stability. The PI-SiO2 membrane with high porosity (90%) presents enhanced conductivity due to the excellent electrolyte wettability and large electrolyte uptake (about 2400%). In addition, the PI-SiO2 membrane displays good mechanical flexibility and enhanced thermal stability up to 250 °C, which significantly improve the safety of lithium-ion batteries when used as a separator. The LiMn2O4/Li cell with the PI-SiO2 separator exhibits highly improved rate capability and cycling stability at different temperatures (25 °C and 55 °C), which make PI-SiO2 membrane as a promising secure separator candidate for high-performance and safety lithium-ion batteries.
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