Solid-State High-Resolution NMR Studies on PEO-Based Crystalline Solid Polymer Electrolytes for Lithium-Ion Battery

Poly(ethylene oxide)-based (PEO-based) crystalline solid polymer electrolytes (SPEs) have been extensively investigated in recent years. Within these works, studies on the conduction mechanism of crystalline SPEs are of particular importance, in order to further improve the performance of these SPEs. Recently, we demonstrated that through careful sample preparation, very high resolution of C-13 and Li-7 NMR spectra of these systems can be obtained at room temperature, which gives the possibility of studying the phase structures and molecular motions of these sample systems at deeper level. A series of works were carried out thereafter on PEO-based crystalline SPEs systems by employing solid-state high-resolution NMR and the obtained results are reviewed here.