阴离子对钠离子电池中普鲁士蓝晶体水反应性和阴极-电解质界面的影响。

IF 10.7 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Jooyoung Jang, Hyebin Jeong, Jeongsoo Hong, Carsten Korte, Sangwon Kim, Changshin Jo
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引用次数: 0

摘要

普鲁士蓝(PB)是一种很有前途的低成本钠离子电池正极材料,但结晶水对性能下降的影响尚不清楚。本研究探讨了PB结晶水与不同电解质盐(naclo4和natfsi)相互作用对溶剂化结构和界面稳定性的影响。基于Hofmeister系列,证明了ClO4 -的强水化维持了水的反应性,促进了铁的氧化和高压下的溶剂分解。相反,弱水化的TFSI-抑制了水诱导的副反应,促进了阴极和阳极上稳定界面的形成。在4.0 V和4.2 V下的电化学分析表明,NaTFSI持续提高可逆性,特别是在4.2 V下,在500次循环中容量保持率达到77.1%,而NaClO4的容量保持率为56.8%。结果强调了电解质依赖的水配位在确定PB电极稳定性中的关键作用,为设计长寿命PB基sib的电解质和界面相提供了有价值的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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.

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来源期刊
Small Methods
Small Methods Materials 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.
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