Flow battery. The battery includes high energy density fluid electrodes having a selected non-Newtonian rheology and structure for providing intermittent flow pulses of controlled volume and duration of the fluid electrodes, the structure adapted to promote interfacial slip to improve flow uniformity. The battery disclosed herein provides a potential solution to large-scale electrical energy storage needs.
 The United States Government has rights in this invention pursuant to DOE-FOA-0000559, Energy Innovation Hub--Batteries and Energy Storage, and ANL Subcontract No. 3F-31144, issued under DOE Prime Contract No. DE-AC02-06CH11357 between the United States Government and UChicago Argonne, LLC representing Argonne National Laboratory.