电解质
溶剂化
二甲氧基乙烷
法拉第效率
无机化学
化学
插层(化学)
化学工程
钾
溶剂
材料科学
电极
有机化学
物理化学
工程类
作者
Weijie Chen,Mengjie Zhang,Hongwei Fu,Jinfan Li,Xinzhi Yu,Jiang Zhou,Bingan Lu
出处
期刊:ACS Nano
[American Chemical Society]
日期:2024-05-03
标识
DOI:10.1021/acsnano.4c02108
摘要
Ether-based electrolytes are among the most important electrolytes for potassium-ion batteries (PIBs) due to their low polarization voltage and notable compatibility with potassium metal. However, their development is hindered by the strong binding between K+ and ether solvents, leading to [K+–solvent] cointercalation on graphite anodes. Herein, we propose a partially and weakly solvating electrolyte (PWSE) wherein the local solvation environment of the conventional 1,2-dimethoxyethane (DME)-based electrolyte is efficiently reconfigured by a partially and weakly solvating diethoxy methane (DEM) cosolvent. For the PWSE in particular, DEM partially participates in the solvation shell and weakens the chelation between K+ and DME, facilitating desolvation and suppressing cointercalation behavior. Notably, the solvation structure of the DME-based electrolyte is transformed into a more cation–anion–cluster-dominated structure, consequently promoting thin and stable solid–electrolyte interphase (SEI) generation. Benefiting from optimized solvation and SEI generation, the PWSE enables a graphite electrode with reversible K+ (de)intercalation (for over 1000 cycles) and K with reversible plating/stripping (the K||Cu cell with an average Coulombic efficiency of 98.72% over 400 cycles) and dendrite-free properties (the K||K cell operates over 1800 h). We demonstrate that rational PWSE design provides an approach to tailoring electrolytes toward stable PIBs.
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