Development of novel inorganic electrolytes for room temperature rechargeable sodium metal batteries,Energy & Environmental Science

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Development of novel inorganic electrolytes for room temperature rechargeable sodium metal batteries
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2017-08-09 00:00:00 , DOI: 10.1039/c7ee01735a
Débora Ruiz-Martínez _{1,

2,

3,

4} , Andras Kovacs _{5,

6,

7} , Roberto Gómez _{1,

2,

3,

4}

Affiliation

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.

中文翻译：

室温可充电钠金属电池用新型无机电解质的开发

在过去的几年中，可充电钠金属电池作为有前途的电源吸引了人们的注意，因为它们是电网大规模储能的低成本选择。然而，在钠金属电池的主要问题中，不均匀的固体电解质界面的形成和钠金属的树枝状生长特别具有挑战性。在这里，我们报道了基于液态氨的高浓度钠电解质，其中已溶解了大量钠盐。这些电解质通常可以描述为的NaY· X NH ₃，其中Y是阴离子（I ^-，BF ₄^-或BH ₄^-）和X表示氨与钠盐的摩尔比。这些电解质的特征在于其优异的性能，例如低易燃性和高比电导率。最重要的是，它们支持钠的非枝晶且高度可逆的镀覆-剥离，为在室温下开发钠金属阳极铺平了道路。另外，可以在具有高库仑效率和沉积稳定性的铜作为衬底上进行钠沉积。

更新日期：2017-08-16

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