Ionic conductivities of poly(methoxy polyethylene glycol monomethacrylate) complexes with LiSO3CH3

Ionic conductivity values for LiSO3CF3 complexes with two amorphous poly(methoxy polyethylene glycol monomethacrylates) (PEM) were determined and values as high as ∼6 × 10−4Ω−1cm−1 at 373 K and ∼2 × 10−5Ω−1cm−1 at 293 K were achieved. These values are compared with those obtained for a poly(ethylene oxide) (PEO)-LiSO3CF3 complex of similar salt concentration with an ether oxygen to Li+ ion ratio of 18. The conductivity results for the complexes are similar at temperatures >343 K but at 293 K the values for the conductivities of the PEM-LiSO3CF3 complexes are approximately two orders of magnitude higher than those for the PEO-LiSO3CF3 complex. This difference is believed to be due at least in part to the presence of a large amount of crystalline material in the PEO-LiSO3CF3 complex below 323 K.