LiCl has a large amount of undissolved salt at the bottom of the container. LiBF 4 also has an observable amount of undissolved salt left after thorough mixing. LiTFSi is fully dissolved in the PDMS oil and yields a more viscous liquid with darker color than LiOTf (Figure ). The differences among the Li + coordinated PDMS containing different counter anions can also be seen from their IR spectra (Figure ). Comparing to the spectrum of PDMS-L, the C=N stretching peak at the wavenumber of 1650 cm -1 is partially shifted to 1593 cm -1 due to the formation of Li + -pyridyl imine coordination in the spectrum of LiTFSi. The peaks at the wavenumber of 1300 -1380cm -1 are from the overlapped C-F and S=O bond stretching in TFSi -anions. Conversely, the spectra of LiCl and LiBF4