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Title: Flowable conducting particle networks in redox-active electrolytes for grid energy storage

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.0011505jes· OSTI ID:1265323

This paper reports a new hybrid approach toward achieving high volumetric energy and power densities in an electrochemical flow capacitor for grid energy storage. The electrochemical flow capacitor suffers from high self-discharge and low energy density because charge storage is limited to the available surface area (electric double layer charge storage). Here, we examine two carbon materials as conducting particles in a flow battery electrolyte containing the VO2+/VO2+ redox couple. Highly porous activated carbon spheres (CSs) and multi-walled carbon nanotubes (MWCNTs) are investigated as conducting particle networks that facilitate both faradaic and electric double layer charge storage. Charge storage contributions (electric double layer and faradaic) are distinguished for flow-electrodes composed of MWCNTs and activated CSs. A MWCNT flow-electrode based in a redox-active electrolyte containing the VO2+/VO2+ redox couple demonstrates 18% less self-discharge, 10 X more energy density, and 20 X greater power densities (at 20 mV s-1) than one based on a non-redox active electrolyte. Additionally, a MWCNT redox-active flow electrode demonstrates 80% capacitance retention, and >95% coulombic efficiency over 100 cycles, indicating the feasibility of utilizing conducting networks with redox chemistries for grid energy storage.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1265323
Journal Information:
Journal of the Electrochemical Society, Vol. 162, Issue 5; ISSN 0013-4651
Publisher:
The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

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Cited By (8)

Pseudocapacitive Electrodes Produced by Oxidant-Free Polymerization of Pyrrole between the Layers of 2D Titanium Carbide (MXene) journal December 2015
Interphases in Electroactive Suspension Systems: Where Chemistry Meets Mesoscale Physics journal April 2019
Waste Tire Derived Carbon-Polymer Composite Paper as Pseudocapacitive Electrode with Long Cycle Life journal September 2015
Editors' Choice—Electrochemical Impedance Spectroscopy of Flowing Electrosorptive Slurry Electrodes journal January 2018
On the Resistances of a Slurry Electrode Vanadium Redox Flow Battery text January 2020
On the Resistances of a Slurry Electrode Vanadium Redox Flow Battery journal May 2020
On the Resistances of a Slurry Electrode Vanadium Redox Flow Battery other January 2020
Interphases in Electroactive Suspension Systems: Where Chemistry Meets Mesoscale Physics journal July 2019

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