X-ray photoelectron spectroscopy as a probe for understanding the potential-dependent impact of fluoroethylene carbonate on the solid electrolyte interface formation in Na/Cu2Sb batteries
X-ray photoelectron spectroscopy as a probe for understanding the potential-dependent impact of fluoroethylene carbonate on the solid electrolyte interface formation in Na/Cu2Sb batteries
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DOI：
10.1016/j.jpowsour.2020.229171
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发表时间：
2021-03
影响因子：
9.2
通讯作者：
Nathan J. Gimble;Leslie A. Kraynak;J. Schneider;Maxwell C. Schulze;A. Prieto
中科院分区：
文献类型：
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作者：
Nathan J. Gimble;Leslie A. Kraynak;J. Schneider;Maxwell C. Schulze;A. Prieto
固体电解质界面（SEI）是由半电池首次放电期间电解质分解形成的，并受到电解质添加剂存在的影响。将初始放电分为由电压截止定义的阶段，可以帮助发现添加剂在 SEI 生长中的作用。在本研究中，X 射线光电子能谱 (XPS) 用于分析钠离子半电池电池中电沉积、无粘合剂 Cu2Sb 薄膜上形成的 SEI。氟代碳酸亚乙酯 (FEC) 是一种已知可以延长电池寿命的电解质添加剂，它的存在对碳 1s XPS 光谱有显着影响。当 FEC 添加到系统中时，含氧碳环境的浓度显着降低。在观察到显着的电化学之前，这些环境就存在于没有 FEC 的样品中，可能显示出钠金属与传统碳酸盐电解质的反应性，从而在电池循环之前形成 SEI 的初始成分。添加 FEC 时观察到的差异可能是 SEI 的化学环境对电池性能产生巨大影响。有趣的是，这些结果表明 SEI 形成的关键因素是在活性材料钠化之前确定的，其中 FEC 发挥着不可或缺的作用。
The solid electrolyte interface (SEI) forms from electrolyte decomposition during the initial discharge of half-cell batteries and is affected by the presence of electrolyte additives. Breaking down the initial discharge into stages, defined by voltage cut offs, can help discover the role of additives in SEI growth. In this study, X-Ray Photoelectron Spectroscopy (XPS) is used to analyze the SEI formed on electrodeposited, binder free Cu2Sb thin films in sodium ion half-cell batteries. The presence of fluoro-ethylene carbonate (FEC), an electrolyte additive known to enhance battery lifetime, has a significant effect on the carbon 1s XPS spectra. The concentration of oxygenated carbon environments are dramatically decreased when FEC is added to the system. These environments were present in samples without FEC before significant electrochemistry was observed, potentially displaying the reactivity of sodium metal with conventional carbonate electrolytes to form the initial components of the SEI before the battery is cycled. The differences observed when FEC is added are likely the chemical environments of the SEI that have the dramatic effect on battery performance. Interestingly, these results suggest that the critical aspects of SEI formation are determined before the active material is sodiated, with FEC playing an integral role.