US 2022/0190374 A1Published application

Energy dense materials for redox flow batteries

AssigneePhillips 66 Company

InventorsJames A. Suttil, Sharmila Samaroo, Neal D. McDaniel, Jeffrey H. Drese, Hongjin Tan

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Abstract

Redox flow battery efficiency and performance may be improved with a high energy density bipyridinium based ionic room-temperature liquid electrolyte. Current electrolytes require solvent to dissolve the redox-active material and a supporting electrolyte to maintain charge balance. A room temperature redox-active electrolyte having intrinsic charge balancing would not need a solvent to form a liquid and would therefore have a higher density of anions and cations involved with charge storage. As such, creating redox-active bipyridinium core ionic materials that are in a liquid form at room temperature or, more particularly, are liquids across the range at which a redox flow battery would operate permit smaller and less costly flow battery design than conventional flow batteries.

Claims20

Dependent claims

A redox flow battery comprising:

a catholyte;
an anolyte;
a catholyte storage tank for storing the catholyte;
an anolyte storage tank for storing the anolyte;
a power cell arranged for catholyte and anolyte to coexist and be physically separated while also in ion communication with one another;
a catholyte pump to circulate the catholyte from the catholyte storage tank to the power cell and back to the catholyte storage tank;
and
an anolyte pump to circulate anolyte from the anolyte storage tank to the power cell and back to the anolyte storage tank;
wherein one of the catholyte and anolyte comprises a redox active ionic liquid having a bipyridinium core with two pyridinium rings and having at least one substituent group attached thereto, wherein the attached at least one substituent group alters the redox active ionic liquid to have a melting point below 70° C.

6 more elements

Dependencies are inferred from the claim text.