Understanding and characterizing the transport and thermodynamic properties of electrolytes are critical for optimizing battery performance. In this study, we employ operando Raman gradient analysis (ORGA) to characterize the concentration-dependent diffusion coefficient, transference number, ionic conductivity, and thermodynamic factor of potassium bis(fluorosulfonyl)imide (KFSI) in triethyl phosphate (TEP), an ideal model system and one of the most promising K-ion battery electrolytes. ORGA demonstrates results consistent with conventional state-of-the-art methods while proving to be significantly more electrolyte- and time-efficient. Additionally, we probe, for the first time, the concentration-dependent transport and thermodynamic properties of KFSI-TEP, providing key parameters for K-ion battery modeling.

中文翻译：

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通过 Operando 拉曼梯度分析 KFSI 在 TEP 中的输运和热力学性质

了解和表征电解质的传输和热力学特性对于优化电池性能至关重要。在这项研究中，我们采用操作拉曼梯度分析（ORGA）来表征磷酸三乙酯（TEP）中双（氟磺酰）亚胺钾（KFSI）的浓度依赖性扩散系数、转移数、离子电导率和热力学因子。模型系统和最有前途的钾离子电池电解质之一。 ORGA 展示的结果与传统的最先进方法一致，同时证明其电解液效率和时间效率显着提高。此外，我们首次探讨了 KFSI-TEP 的浓度依赖性输运和热力学特性，为钾离子电池建模提供了关键参数。