Lithium Salt-doped, Gelled Polymer Electrolyte with a Nanoporous, Bicontinuous Cubic Architecture and High Room-temparature Ion Conductivity
A research team at the University of Colorado at Boulder led by Douglas GIn has developed a polymer-based electrolyte material for use in lithium ion batteries that exhibits better ion conductivity than traditional Li polymer electrolytes at low temperatures.Description
The polymer-based electrolyte material was developed for use in lithium ion batteries is described as exhibiting high bulk ion conductivity at ambient and sub-ambient temperatures. This material is a composite comprised of an ionic, polymerizable Li salt surfactant that self-organizes around a small amount of non-aqueous solvent containing a Li salt dopant to form a phase-separated, nanoporous lyotropic liquid crystal (LLC) assembly. The incorporated solvent is contained within the nanopores of the structure. The resulting solid-liquid nanocomposite material exhibits a high ion conductivity at 23°C. The amount of conductivity is comparable to, or better than, that of traditional Li ion battery polymer electrolytes based on highly solvent-swollen, non-charged polymers. The phase-separated, ordered, nanoporous structure of this composite material provides good liquid-solution-like Li+ mobility but in a flexible, solid polymer format. This doped, liquid-filled polyelectrolyte material retains its ion conductivity better than traditional Li polymer electrolytes at low temperatures. The extremely small diameter Li ion-containing liquid-filled nanopores in this composite material may also afford suppression of Li metal dendrite growth during secondary battery cycling, which is a problem in conventional polymer-based electrolytes.More InformationLiquid Electrolyte Filled Polymer Electrolyte. PCT filed March 23, 2010; nationalized to U.S. only.
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