Investigation of the conduction mechanisms of lithium gel polymer electrolytes based on electrical conductivity and diffusion coefficient using NMR

Conduction mechanisms of the polymer gel electrolytes of lithium were inves tigated from the electrical conductivity and diffusion coefficient by pulse d gradient spin echo NMR. The gel electrolytes prepared by the phase invers ion method showed characteristic features in conductivity depending on the kind of the nonsolvent used during the polymer preparation process. This is first due to the solution content retained in the polymer. The diffusion c oefficients of some gels were composed of two components which are attribut ed to the two phases: the trapped solution in the cavities in the polymer f ramework structure and the swollen polymer chains. The swollen polymer is c losely correlated with the high conductivity of this type of gel electrolyt e through the interactive effect between the electrolyte and the polymer ch ains.