Elimination of active species crossover in a room temperature, neutral pH, aqueous flow battery using a ceramic NaSICON membrane
| Autor: | Harry D. Pratt, Erik David Spoerke, Ganesan Nagasubramanian, Eric Allcorn, David Ingersoll |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Aqueous solution
Materials science Renewable Energy Sustainability and the Environment 020209 energy Energy Engineering and Power Technology 02 engineering and technology Conductivity 021001 nanoscience & nanotechnology Flow battery Energy storage Dielectric spectroscopy Membrane Chemical engineering visual_art 0202 electrical engineering electronic engineering information engineering visual_art.visual_art_medium Fast ion conductor Ceramic Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Journal of Power Sources. 378:353-361 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2017.12.041 |
| Popis: | 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 × 10−10 cm2 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. |
| Databáze: | OpenAIRE |
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