Fluorinated ethylene carbonate as additive to glyme electrolytes for robust sodium solid electrolyte interface
Fluorinated ethylene carbonate as additive to glyme electrolytes for robust sodium solid electrolyte interface
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DOI：
10.1016/j.xcrp.2023.101356
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发表时间：
2023-04
影响因子：
8.9
通讯作者：
S. Sarkar;M. Lefler;B. Vishnugopi;R. B. Nuwayhid;C. Love;R. Carter;P. Mukherjee
中科院分区：
文献类型：
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作者：
S. Sarkar;M. Lefler;B. Vishnugopi;R. B. Nuwayhid;C. Love;R. Carter;P. Mukherjee
有机电解质固有的不稳定性阻碍了碱金属阳极的利用。由于钠的天然丰度高，人们对其越来越感兴趣，但在锂系统中流行的碳酸盐电解质不能与钠电极形成稳定的固体电解质界面（SEI）。利用半电池和对称电池分析，我们确定了在金属钠界面产生薄的无机SEI的特定glyme（链醚）电解质，并通过x射线光电子能谱研究了碳酸乙烯和氟碳酸乙烯（FEC）添加剂对这些体系中形成的SEI的影响。通过原位光学显微镜，我们观察到这些电解质中钠枝晶的发生和生长。我们确定仅由glyme形成的SEI可能不支持广泛或极端的循环条件，但FEC的加入提供了更强大的SEI，以促进许多一致的镀钠和剥离循环。
The utilization of alkali metal anodes is hindered by an inherent instability in organic electrolytes. Sodium is of growing interest due to its high natural abundance, but the carbonate electrolytes popular in lithium systems cannot form a stable solid electrolyte interphase (SEI) with a sodium electrode. Using half-cell and symmetric-cell analysis, we identify specific glyme (chain ether) electrolytes that produce thin, predominantly inorganic SEI at the sodium metal interface, and we study the effect of ethylene carbonate and fluoroethylene carbonate (FEC) additives on the SEI formed in these systems via X-ray photoelectron spectroscopy. Throughin situoptical microscopy, we observe the onset and growth of sodium dendrites in these electrolytes. We determine that the SEI formed by glyme alone may not support extensive or extreme cycling conditions, but the addition of FEC provides a more robust SEI to facilitate numerous consistent sodium plating and stripping cycles.