fig2

Figure 2. Evaluation of physiochemical parameters for PP, PEI and PEI-EDA separators. (A) Porosity and electrolyte-uptake rate; (B) Contact angle; (C) LSV curves (inset: the magnified LSV curves); (D) EIS analysis (inset: the magnified EIS analysis); (E) Li⁺ ion transference number (inset: Nyquist plots before and after polarization); (F) Radar chart of key properties indicators. PEI-EDA: Ethylenediamine grafting polyetherimide; PEI: polyetherimide; PP: polypropylene; LSV: linear sweep voltammetry; EIS: electrochemical impedance spectroscopy.