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Environmentally Benign Electrolytes With Wide Electrochemical Windows

DOE Grant Recipients

Arizona Technology Enterprises

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Technology Marketing SummaryAs mobile electronics continue to evolve, the need for safe, long-lasting rechargeable batteries has grown tremendously. In the search for suitable materials from which to construct high energy density solid state batteries, one of the principal obstacles has been the provision of a suitable electrolyte that exhibits the right combination of conductivity and ion mobility, consistency, wide electrochemical window, and good adherence to electrode surfaces. Very few electrolytes have been developed thus far that exhibit the above combination of performance parameters. Despite significant research in the area, there remains a need for improved electrolyte solvents that can be easily incorporated into voltaic cells without significant extra cost.DescriptionOne particular group of organic solvents, sulfones, offers promising solutions due to their chemical and thermal stability. Researchers at Arizona State University have developed new non-aqueous solvents comprised of a non-symmetrical, non cyclic sulfone. These solvents are environmentally friendly and have wide electrochemical windows. Safe, high-output electrochemical devices can be facilitated through use of this solvent.Benefits•    Higher Conductivity – Conductivities of 10^-2.28 S/cm have been achieved.
•    Higher Solubility – These solvents can dissolve large mole fractions of most electrolyte solutions including alkali salts. Stable concentrations above 2.5 molar
have been achieved.
•    Longer Cycle Life – The solvents remain highly effective even after hundreds ofcharge / discharge cycles.
•    Lithium Compatible – These solvents work well with alkali metal anodes in general, and with lithium and lithium-ion anodes in particular. Additionally, they
facilitate the reversible intercalation of lithium into graphite.
•    Lower Volatility - The solvents exhibit high thermal stability and low ambient temperature volatility.
•    Wider Electrochemical Window - The solvents have a wide electrochemical window of ~6.0 volts.
•    Environmentally Friendly - The solvents have minimal environmental impact.
Applications and Industries•    Rechargeable Batteries
•    Fuel Cells
•    Photovoltaic Cells
•    Photochromic Displays
•    Other Electrochemical Applications
More InformationThis technology is part of a suite of electrolyte and battery technologies developed at Arizona State University. Significant testing has been completed, and the results have been published. At this time, AzTE is seeking potential partners and licensees for this issued patent and related technologies.Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Patent 6,245,465
Non-aqueous electrolyte solvents for secondary cells
The present invention pertains to non-aqueous electrolyte solvents which comprise a non-symmetrical, non-cyclic sulfone and which are suitable for use in secondary electric current producing cells. The present invention also pertains to electrolyte elements comprising such solvents, electric current producing cells comprising such electrolyte elements, and methods for making such electric current producing cells. More particularly, the present invention pertains to electrolyte elements comprising a non-aqueous electrolyte solvent, which solvent comprises a non-symmetrical, non-cyclic sulfone of the general formula R.sup.1 --SO.sub.2 --R.sup.2, wherein R.sup.1 and R.sup.2 are independently linear or branched alkyl or partially or fully fluorinated linear or branched alkyl groups having 1 to 7 carbon atoms, wherein R.sup.1 and R.sup.2 are different, and wherein --SO.sub.2 -- denotes the sulfone group.
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
AzTE Case #96-024DevelopmentAvailable03/13/201203/13/2012

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