Monodispersed Poly(ethylene oxides) and Their Role in Conductivity Mechanism in Crystalline Polymer Electrolytes
By employing monodispersed polymers (with a discrete chain length) we attempt to reduce a number of variables that are likely to influence the ion transport process. However, monodispersed poly(ethylene oxides) are not readily available and therefore, a synthetic method has been developed to obtain a series of monodispersed homologues in a variety of chain lengths.
These monodispersed polymers were used to prepare a series of crystalline complexes with a lithium salt (PEO6:LiPF6). Correlation between chain length of the polymer and unit cell parameters of the crystalline complexes in combination with molecular dynamics simulations3 revealed different structural arrangements at polymer chain-end regions. These arrangements and their role in coordination of lithium ions, ion mobility and transport, and the resulting conductivities will be presented.
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