Exploring the Role of Vinylene Carbonate in the Passivation and Capacity Retention of Cu2Sb Thin Film Anodes,The Journal of Physical Chemistry C

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Exploring the Role of Vinylene Carbonate in the Passivation and Capacity Retention of Cu2Sb Thin Film Anodes
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-11-18 , DOI: 10.1021/acs.jpcc.0c04064
Leslie A. Kraynak ₁ , Jacob D. Schneider ₁ , Amy L. Prieto ₁

Affiliation

Electrolyte additives such as vinylene carbonate (VC) have been demonstrated to improve the capacity retention for many types of Li-ion battery electrodes, including intermetallic alloying anodes, but it is still unclear why VC extends the cycle lifetime of copper antimonide (Cu₂Sb) anodes so dramatically. Here, we have studied how VC affects the solid electrolyte interface formed on Cu₂Sb thin film anodes in fluorine-free electrolyte solutions in order to better understand which nonfluorinated species may play an important role in effective Cu₂Sb passivation. Using differential capacity analysis and X-ray photoelectron spectroscopy, we have found that VC effectively passivates Cu₂Sb and prevents Cu/Cu₂Sb oxidation at high potentials. Carbonate species from the reduction of VC seem to play an important role in passivation, while inorganic species like LiClO₄ from the F-free supporting electrolyte do not seem to be beneficial.

中文翻译：

探索碳酸亚乙烯酯在Cu ₂ Sb薄膜阳极钝化和容量保持中的作用

电解质添加剂（例如碳酸亚乙烯酯（VC））已被证明可以改善许多类型的锂离子电池电极（包括金属间合金阳极）的容量保持能力，但仍不清楚为什么VC可以延长锑化铜（Cu ₂ Sb ）阳极。在这里，我们研究了VC如何影响在无氟电解质溶液中形成于Cu ₂ Sb薄膜阳极上的固体电解质界面，以便更好地了解哪些非氟化物质可能在有效的Cu ₂ Sb钝化中起重要作用。使用差示电容分析和X射线光电子能谱，我们发现VC有效地钝化了Cu ₂ Sb并防止了Cu / Cu ₂锑在高电位下被氧化。VC还原产生的碳酸盐物种似乎在钝化中起着重要作用，而无F支持电解质中的无机物种（如LiClO _4）似乎没有益处。

更新日期：2020-12-03

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