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Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/3739

Title: Morphology and anisotropic ionic conductivity properties of poly(ethylene oxide)-lithium salt holographic polymer dispersed electrolyte volume gratings
Authors: Smith, Derrick M.
Keywords: Materials science;Polymerization--Research;Renewable energy sources
Issue Date: May-2011
Abstract: Energy has become one of the most urgent topics of conversation, not only from consumer desire but from energy consumption being the leading contributor to greenhouse gas emissions. As energy sources are replaced with renewable supplies, the need for longer lasting, faster and more versatile energy storage devices soars. While many researchers have demonstrated repeatable characteristics of electrolytes, membranes and cathode systems, the fundamentals behind the interactions during ionic diffusion in polymer membranes, which hold the key to improving performance of energy storage devices such as fuel cells and Lithium ion batteries, are not well understood, specifically the role nanostructures play in affecting the macro-properties of ionic diffusion. This is partially because of the challenge to fabricate model systems that allows reconciliation of meaning between nanostructures and their corresponding ion conducting behavior To this end, in this thesis work, Holographic Polymer Dispersed Electrolyte (HPDE) volume gratings comprised of alternating layers of crosslinked polymer resin and lithium ion salt were fabricated using holographic polymerization and the average d-spacing of the layers are approximately 200 nm. Two optical setups were used as a model system to write patterns with the normal direction of the layers both perpendicular and parallel to the film. These one-dimensional confinement structures were used to study the anisotropic ionic conductivity of through and in-plane of the confined electrolyte layers and the unique ion conducting behavior was correlated with nanoscale phase separation. These volume gratings also offer an exciting route to fabricate multifunctional gratings for optic and sensing applications.
Description: Thesis (M.S., Materials science)--Drexel University, 2011.
URI: http://hdl.handle.net/1860/3739
Appears in Collections:Drexel Theses and Dissertations

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