Operando Raman Spectroscopy Insights into the Electrochemical Formation of F-Graphite Intercalation Compounds,ACS Energy Letters

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Operando Raman Spectroscopy Insights into the Electrochemical Formation of F-Graphite Intercalation Compounds
ACS Energy Letters ( IF 19.3 ) Pub Date : 2024-03-12 , DOI: 10.1021/acsenergylett.4c00130
Yuta Ito _{1,

2} , Changhee Lee ₁ , Yuto Miyahara ₁ , Kohei Miyazaki ₁ , Takeshi Abe ₁

Affiliation

This study presents the first observation of the electrochemical formation of graphite-F intercalation compounds (GICs) within LiF-containing organic liquid electrolytes. As determined by operando Raman spectroscopy measurements, the peaks corresponding to the G band (i.e., in-plane mode of sp² bonded carbon with a planar configuration) in highly oriented pyrolytic graphite (HOPG) are separated during the process of electrochemical oxidation, indicating that F-GIC is electrochemically formed in the HOPG electrodes. Furthermore, the rate of reaction and the reversibility of the electrochemical intercalation/deintercalation of F^– are notably enhanced in HOPG electrodes endowed with a LiF-based surface layer. This enhancement suggests that augmenting the activity of F^– ions, coupled with the suppression of side reactions, is pivotal for the successful electrochemical synthesis of F-GICs.

中文翻译：

Operando 拉曼光谱洞察 F-石墨插层化合物的电化学形成

这项研究首次观察到含 LiF 有机液体电解质中石墨-F 插层化合物 (GIC) 的电化学形成。通过操作拉曼光谱测量确定，在电化学氧化过程中，高取向热解石墨（HOPG）中对应于 G 带（即具有平面构型的sp ²键合碳的面内模式）的峰被分离，表明F-GIC 在 HOPG 电极中以电化学方式形成。此外，在具有 LiF 基表面层的 HOPG 电极中，F ^-的反应速率和电化学嵌入/脱嵌的可逆性显着增强。这种增强表明，增强 F ^-离子的活性，加上副反应的抑制，对于 F-GIC 的成功电化学合成至关重要。

更新日期：2024-03-12

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