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

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Title: Development of novel inorganic electrolytes for room temperature rechargeable sodium metal batteries
Authors: Ruiz Martínez, Débora | Kovacs, Andras | Gómez, Roberto
Research Group/s: Grupo de Fotoquímica y Electroquímica de Semiconductores (GFES)
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Inorganic electrolytes | Rechargeable sodium metal batteries | Liquid ammonia
Knowledge Area: Química Física
Issue Date: 9-Aug-2017
Publisher: Royal Society of Chemistry
Citation: Energy & Environmental Science. 2017, 10: 1936-1941. doi:10.1039/C7EE01735A
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.
Sponsor: Financial support from the Spanish Ministry of Economy and Competitiveness through project MAT2015-71727-R (FONDOS FEDER) is acknowledged. Broadbit batteries thanks Tekes, Finnish Funding agency for Innovation Project 4437/31/2015.
ISSN: 1754-5692 (Print) | 1754-5706 (Online)
DOI: 10.1039/C7EE01735A
Language: eng
Type: info:eu-repo/semantics/article
Rights: © The Royal Society of Chemistry 2017
Peer Review: si
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Appears in Collections:INV - GFES - Artículos de Revistas

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