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Development of novel inorganic electrolytes for room temperature rechargeable sodium metal batteries

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Abstract

Rechargeable sodium metal batteries have attracted attention as promising power sources over the last several years, because they are a lower cost option for large scale energy storage from the electric grid. However, among the main problems of Na-metal batteries, the formation of nonuniform solid electrolyte interfaces and the dendritic growth of sodium metal are particularly challenging. Here, we report on highly-concentrated sodium electrolytes based on liquid ammonia in which a large amount of sodium salt has been dissolved. These electrolytes can be generally described as NaY·xNH3, where Y is the anion (I, BF4 or BH4) and x indicates the molar ratio of ammonia to sodium salt. These electrolytes are characterized by their excellent properties such as low flammability and high specific conductivity. Most importantly, they support nondendritic and highly reversible plating–stripping of sodium, paving the way for the development of sodium metal anodes at room temperature. In addition, sodium deposition can be performed on copper as a substrate with a high coulombic efficiency and deposit stability.

Graphical abstract: Development of novel inorganic electrolytes for room temperature rechargeable sodium metal batteries

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Publication details

The article was received on 21 Jun 2017, accepted on 09 Aug 2017 and first published on 09 Aug 2017


Article type: Communication
DOI: 10.1039/C7EE01735A
Citation: Energy Environ. Sci., 2017, Advance Article
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    Development of novel inorganic electrolytes for room temperature rechargeable sodium metal batteries

    D. Ruiz-Martínez, A. Kovacs and R. Gómez, Energy Environ. Sci., 2017, Advance Article , DOI: 10.1039/C7EE01735A

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