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Lithium Salt-doped, Gelled Polymer Electrolyte with a Nanoporous, Bicontinuous Cubic Architecture and High Room-temparature Ion Conductivity

University of Colorado

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Technology Marketing SummaryLi ion batteries have high energy density, high power delivery, and the ability to be recharged over a large number of cycles. One component that needs to be improved to make them suitable for high performance applications is the electrolyte material . High Li ion mobility/conductivity in electrolyte material is required for larger energy applications, and efficient discharge and recharge with a minimum of power loss to resistive heating. However, these electrolytes can leak from the battery, are flammable, and often have poor chemical, thermal, and electrochemical stability in contact with the highly reducing Li metal anode material.

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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To: Lola Underwood<>