A series of novel porous fluorinated polyimide (FPI) separators containing trifluoromethyl group (–CF₃) were prepared by the non-solvent induced phase separation (NIPS) strategy. The prepared FPI separator with 60% molar content (fluorinated dianhydride: non-fluorinated dianhydride: diamine = 60: 40: 100) of fluorinated groups (FPI-60%) could stably exist in the electrolyte as a LIBs separator. The resultant FPI-60% separator possesses high thermal stability with the T_g of 289.4°C and exhibits no shrinkage even at 200°C. The morphologies of the FPI-60% separators were adjusted by introducing small molecular non-solvent additives-ethanol, and the FPI-60% separators present the spongy-like and interconnected structure with different porosity as the amount of ethanol changed from 1 wt% to 10 wt%. The FPI-60% separators display excellent electrolyte uptake with 170%–200% and the ionic conductive could reach 1.17 mS/cm which is four times approximately than that of the PP separator. The lithium-ion batteries (LIBs) using FPI-60% separators with 10 wt% ethanol added show better rate capacities (102.8 mAh/g, 70.8 mAh/g of PI-10 and PP separator at 2 C, respectively) and the capacity retention rate is 93.2% after 50 cycles. The results prove that the porous FPI separator is a promising candidate for high-performance LIBs.

通过非溶剂诱导相分离（NIPS）策略制备了一系列含有三氟甲基（–CF ₃）的新型多孔氟化聚酰亚胺（FPI）隔板。所制备的具有60％摩尔含量（氟化二酐：非氟化二酐：二胺= 60：40：100）的氟基（FPI-60％）的FPI隔膜可以作为LIBs隔膜稳定地存在于电解质中。所得的FPI-60％分离器具有很高的热稳定性，T _g熔点为289.4℃，即使在200℃也没有收缩。通过引入小分子非溶剂添加剂乙醇来调节FPI-60％分离器的形态，随着乙醇量从1 wt％变化，FPI-60％分离器呈现出海绵状且相互连接的结构，并具有不同的孔隙率。至10重量％。FPI-60％隔膜显示出优异的电解质吸收率，为170％–200％，离子导电性可以达到1.17 mS / cm，约为PP隔膜的四倍。使用添加了10 wt％乙醇的FPI-60％隔膜的锂离子电池（LIB），其额定容量（在2 C下分别为102.8 mAh / g，PI-10和PP隔膜分别为70.8 mAh / g）和容量更好50个循环后的保留率为93.2％。