Conductivity Studies on Poly(methoxyethoxyethylmethacrylate)‐Lithium Salt Complexes

Poly(MEEMA), poly(methoxyethoxyethylmethacrylate), a short etheroxy side chain containing polymethacrylate, readily forms polymer‐metal salt complexes with LiX ( X − = ClO 4 − , BF 4 − , CF 3 SO 3 − ) and MI ( M = Na , K ) . Detailed dc conductivity measurements by a complex impedance method have been carried out on poly ( MEEMA ) ‐ LiX complexes by varying the (polymer:metal salt) composition ratio at different temperatures. The ionic conductivities of these polymer electrolytes are high, with the best values obtained for the LiBF 4 system. The temperature dependence of ionic conductivity is not linear and exhibits a curvature suggesting a non‐Arrhenius behavior. However, the Vogel‐Tammann‐Fulcher plots are linear.