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Title: Accessing a high‐voltage nonaqueous hybrid flow battery with a sodium‐methylphenothiazine chemistry and a sodium‐ion solid electrolyte

Journal Article · · Energy Storage
DOI:https://doi.org/10.1002/est2.281· OSTI ID:1843992
 [1]; ORCiD logo [1]
  1. Materials Science and Engineering Program and Texas Materials Institute The University of Texas at Austin Austin Texas USA

Abstract The development of redox flow batteries (RFBs) with nonaqueous electrolytes offers the possibility of accessing a high cell‐operation voltage (no restrain of hydrogen evolution and oxygen evolution potentials) and a low operation temperature (can be operated below the freezing point of water). Therefore, nonaqueous RFBs have recently garnered increasing attention. However, the cross‐mixing of liquid electrode/electrolyte materials has been plaguing the progress of the nonaqueous RFBs. Herein, we present a crossover‐free, high voltage nonaqueous hybrid flow battery (HFB) with a novel sodium‐methylphenothiazine (MPT) chemistry and a single‐ion solid‐electrolyte separator. The Na‐MPT redox couple delivers a high voltage of ~2.6 V when the cell was operated at a medium current density. A NASICON‐type solid electrolyte membrane (Na 3 Zr 2 Si 2 PO 12 ) could circumvent the crossover of the liquids between the positive and negative electrodes, and meanwhile could maintain a single‐ion (Na + ‐ion) conduction between the two electrodes to sustain the electrochemical reactions. Under such an electrochemical mechanism, the nonaqueous Na‐MPT HFB shows remarkable cycling performance.

Sponsoring Organization:
USDOE
OSTI ID:
1843992
Journal Information:
Energy Storage, Journal Name: Energy Storage Vol. 4 Journal Issue: 1; ISSN 2578-4862
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Country unknown/Code not available
Language:
English

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