Solid-state NMR Study On The Structures Of PEO/LiClO₄ Polymer Electrolyte System

Lithium perchlorate/poly (ethylene oxide) complex, as potential polymer electrolytes, has attracted much research interests in the past decades, due to its great applicational significance. However, despite of great efforts, the mechanism of ion conducting of the system is still a topic with debates. In this work, we measured the ¹³C CP/MAS spectra of a series of PEO/LiClCO₄ complexes with different compositions. We found that for the extensively dried samples, the characteristics of the spectra vary greatly with the composition. We measured the conductivity of the different [O]:[Li] molar ratio sample. From the result we found that there were exist at least four crystalline complex structure in the dry PEO/UClO₄ complex. And two of the phase suggested that contribute to the conductivity. In the further work, We will measure the ¹³C T₁ , ¹H Tiand ¹H T_1p of the each sample. Combing with Raman and WAXD measurements to explain what the microcrystalline structure is.