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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.
[1] P. G. Bruce, B. Scrosati and J. M. Tarascon, Angewandte Chemie-International Edition 2008, 47, 2930-2946. [2] E. Staunton, Y. G. Andreev and P. G. Bruce, Faraday Discussions 2007, 134, 143-156. [3]A. Liivat, D. Brandell, A. Aabloo and J. O. Thomas, Polymer 2007, 48, 6448-6456.