Influence of Strong Ionic Interaction on the Kinetics of Graphite Intercalation Compound Formation
Influence of Strong Ionic Interaction on the Kinetics of Graphite Intercalation Compound Formation
复制标题
强离子相互作用对石墨层间化合物形成动力学的影响
DOI：
10.1002/cssc.202201569
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发表时间：
2022
期刊：
影响因子：
8.4
通讯作者：
Abe Takeshi
中科院分区：
文献类型：
--
作者：
Miyazaki Kohei;Mizawa Atsushi;Ito Yuta;Sagane Fumihiro;Abe Takeshi
阴离子的石墨插层化合物（GIC）作为用于双离子电池的正极引起了广泛关注。在本研究中，双（三氟甲磺酰基）酰胺（TFSA）阴离子的GIC的电化学合成与锂或镁盐的离子液体中，研究GIC的形成动力学。通过改变LiTFSA或Mg（TFSA）2的浓度，发现界面阴离子转移阻力的活化能与离子液体电解质的粘度相关。这种活化能的变化是离子液体特有的，在普通的分子溶剂电解质中看不到。此外，具有几乎相同粘度的离子液体表现出相似的电阻和活化能。在这项研究中发现的离子液体的粘度与界面阴离子转移的动力学参数之间的关系为旨在实现高容量和高倍率性能的双离子电池的构建提供了重要的见解。
Graphite intercalation compounds (GICs) of anions have attracted much attention as a positive electrode for use in dual‐ion batteries. In this study, GICs of bis(trifluoromethanesulfonyl)amide (TFSA) anions were electrochemically synthesized in ionic liquids with lithium or magnesium salts to investigate the kinetics of GICs formation. By varying the concentrations of LiTFSA or Mg(TFSA)2, the activation energy of interfacial anion transfer resistance was discovered to be correlated with the viscosity of the ionic liquid electrolytes. Such a change in activation energy is unique to ionic liquids and not seen in common molecular solvent electrolytes. In addition, ionic liquids with nearly identical viscosities exhibited similar resistances and activation energies. The relationship between the viscosity of ionic liquids and the kinetic parameters of interfacial anion transfer found in this study provides important insights for the construction of dual‐ion batteries that aim for both high capacity and high rate capability.