Elimination of active species crossover in a room temperature, neutral pH, aqueous flow battery using a ceramic NaSICON membrane

JOURNAL OF POWER SOURCES

卷:378

Article

Allcorn, Eric¹  Nagasubramanian, Ganesan¹  Pratt, Harry D., III¹  Spoerke, Erik¹  Ingersoll, David¹ 

[1] Sandia Natl Labs, POB 5800,MS 0614, Albuquerque, NM 87185 USA

关键词: Flow battery;    Sodium-ion;    Aqueous battery;    Ion-exchange membrane;    NaSICON;   

DOI  :  10.1016/j.jpowsour.2017.12.041

来源: Elsevier

【 摘 要 】

Flow batteries are an attractive technology for energy storage of grid-scale renewables. However, performance issues related to ion-exchange membrane (IEM) fouling and crossover of species have limited the success of flow batteries. In this work we propose the use of the solid-state sodium-ion conductor NaSICON as an IEM to fully eliminate active species crossover in room temperature, aqueous, neutral pH flow batteries. We measure the room temperature conductivity of NaSICON at 2.83-4.67 mS cm(-1) and demonstrate stability of NaSICON in an aqueous electrolyte with conductivity values remaining near 2.5 mS cm(-1) after 66 days of exposure. Charge and discharge of a full H-cell battery as well as symmetric cycling in a flow battery configuration using NaSICON as an IEM in both cases demonstrates the capability of the solid-state IEM. Extensive analysis of aged cells through electrochemical impedance spectroscopy (EIS) and UV-vis spectroscopy show no contaminant species having crossed over the NaSICON membrane after 83 days of exposure, yielding an upper limit to the permeability of NaSICON of 4 x 10(-10) cm(2) min(-1). The demonstration of NaSICON as an IEM enables a wide new range of chemistries for application to flow batteries that would previously be impeded by species crossover and associated degradation.

【 授权许可】

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