“…With an increase in the molar ratio of PDO from 4:1 to 8:1, clear solutions of ILA 4:1 , ILA 6:1 , and ILA 8:1 could be formed under the same heating conditions (Figure a). The components’ characteristic peaks of C–C (850 cm –1 , 872 cm –1 ) in PDO and C–N (717 cm –1 ) and C–H (3032 cm –1 ) in ChCl coexist in ILA 4:1 , ILA 6:1 , and ILA 8:1 (Figure S1a), , indicating the formation of ILAs due to H-bond interaction at 3000–3600 cm –1 ; the O–H vibrations in Raman spectra can be divided into three parts: strong H-bonds, weak H-bonds, and non-H-bonds. ,− In our case, the position of the strong H-bonds in ChCl and PDO shifts to higher and lower wavenumbers, respectively (Figure S1b), confirming the variation of the chemical environment of H-bonds in ILAs. The electrochemical methods are employed to characterize the conductivity by monitoring the response current in CV and solution resistance ( R s , i.e., the value of the intersection of the high-frequency portion of the curve with the X -axis) in EIS. − The result of CV measurements indicates that the conductivity of ILAs decreases with the content of ChCl (Figure b); compared with ILA 6:1 and ILA 8:1 , ILA 4:1 presents the highest conductivity, which is confirmed by the smallest R s , as shown in Figure c.…”