Abstract
Solid-state high-resolution13C/7Li nuclear magnetic resonance (NMR) study was performed on the phase structure and chain dynamics of PEG-PPG-PEGn/LiCF3SO3(n=3, 6, 12) copolymer electrolytes. PEG repeating units and Li+form PEG3:LiCF3SO3crystalline complex and PE3/Li+amorphous complex in all the samples. PPG repeating units and Li+form different complexes with respect to O:Li+feed ratio (denoted as PP/Li+-3/6/12). The13C chemical shifts and half widths of the signals from PP/Li+-3/6/12 remain unchanged, which implies the structures of PP/Li+-3/6/12 are similar at least in a very short range. The half width of the7Li signals from PP/Li+-3/6/12 becomes narrower and narrower as the Li+concentration decreases. This indicates the chain mobility of the amorphous phase increases with the decrease of ionic concentration. Moreover, neat crystalline PEG, neat amorphous PEG and neat amorphous PPG start to appear when O:Li+is greater than 3:1 and their contents increase with the increase of O:Li+. Overall, solid-state high-resolution NMR is a powerful and unique method for understanding the phase structure and chain dynamics of solid polymer electrolytes (SPEs), more applications of this technique to studies on SPEs is expecting.
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