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Revealing the mechanism of saturated ether electrolyte for improving the long-cycling stability of Na-O2 batteries

Journal Article


Abstract


  • Na-O2 batteries have been considered as promising energy storage systems due to their high energy density and low cost. Their poor cycle life, however, and their unclear interfacial formation mechanisms have greatly hindered the development of Na-O2 batteries. In this work, compared to the commonly used ether-based electrolyte (0.5 M sodium trifluomethanesulfonate in tetraethylene glycol dimethyl ether), its saturated electrolyte is employed for Na-O2 batteries to achieve around four times longer cycle life. Both experiments and simulations suggest that the enhanced cycling stability could be attributed to the use of saturated electrolyte, which plays important roles in reducing the dissolution of NaO2, thereby easing the shuttle effect of O2-; sharply decreasing dissolved oxygen, thus eliminating Na anode oxidation; and effectively suppressing Na dendrite growth because of the high Na+ flux in saturated electrolyte, thus relieving the nonuniformity of the Na+ flux.

UOW Authors


Publication Date


  • 2021

Citation


  • Ma, J. L., Zhang, W. C., Wang, X. D., Tang, M., Huang, Z. Y., Li, J., . . . Wang, Y. (2021). Revealing the mechanism of saturated ether electrolyte for improving the long-cycling stability of Na-O2 batteries. Nano Energy, 84. doi:10.1016/j.nanoen.2021.105927

Scopus Eid


  • 2-s2.0-85101520802

Web Of Science Accession Number


Volume


  • 84

Abstract


  • Na-O2 batteries have been considered as promising energy storage systems due to their high energy density and low cost. Their poor cycle life, however, and their unclear interfacial formation mechanisms have greatly hindered the development of Na-O2 batteries. In this work, compared to the commonly used ether-based electrolyte (0.5 M sodium trifluomethanesulfonate in tetraethylene glycol dimethyl ether), its saturated electrolyte is employed for Na-O2 batteries to achieve around four times longer cycle life. Both experiments and simulations suggest that the enhanced cycling stability could be attributed to the use of saturated electrolyte, which plays important roles in reducing the dissolution of NaO2, thereby easing the shuttle effect of O2-; sharply decreasing dissolved oxygen, thus eliminating Na anode oxidation; and effectively suppressing Na dendrite growth because of the high Na+ flux in saturated electrolyte, thus relieving the nonuniformity of the Na+ flux.

UOW Authors


Publication Date


  • 2021

Citation


  • Ma, J. L., Zhang, W. C., Wang, X. D., Tang, M., Huang, Z. Y., Li, J., . . . Wang, Y. (2021). Revealing the mechanism of saturated ether electrolyte for improving the long-cycling stability of Na-O2 batteries. Nano Energy, 84. doi:10.1016/j.nanoen.2021.105927

Scopus Eid


  • 2-s2.0-85101520802

Web Of Science Accession Number


Volume


  • 84