Jooyoung Jang, Hyebin Jeong, Jeongsoo Hong, Carsten Korte, Sangwon Kim, Changshin Jo
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Anion Effects on Crystal Water Reactivity and Cathode-Electrolyte Interphase of Prussian Blue in Sodium-Ion Batteries.
Prussian blue (PB) is a promising low-cost cathode material for sodium-ion batteries (SIBs), but the impact of crystal water on performance degradation remains unclear. This study explores how PB's crystal water interacts with different electrolyte salts-NaClO4 and NaTFSI-affecting solvation structure and interfacial stability. Based on the Hofmeister series, it is demonstrated that the strong hydration of ClO4- sustains water reactivity, promoting Fe oxidation and solvent decomposition at high voltages. In contrast, the weakly hydrated TFSI- suppresses water-induced side reactions and facilitates the formation of stable interphases on both cathode and anode. Electrochemical analysis at 4.0 V and 4.2 V revealed that NaTFSI consistently improves reversibility, particularly at 4.2 V, achieving 77.1% capacity retention over 500 cycles-56.8% for NaClO4. The results highlight the crucial role of electrolyte-dependent water coordination in determining PB electrode stability, offering valuable insights for designing electrolytes and interphases for long-life PB-based SIBs.
Small MethodsMaterials Science-General Materials Science
CiteScore
17.40
自引率
1.60%
发文量
347
期刊介绍:
Small Methods is a multidisciplinary journal that publishes groundbreaking research on methods relevant to nano- and microscale research. It welcomes contributions from the fields of materials science, biomedical science, chemistry, and physics, showcasing the latest advancements in experimental techniques.
With a notable 2022 Impact Factor of 12.4 (Journal Citation Reports, Clarivate Analytics, 2023), Small Methods is recognized for its significant impact on the scientific community.
The online ISSN for Small Methods is 2366-9608.