电解质
共晶体系
离子电导率
化学工程
电导率
材料科学
氢键
化学
氢
溶剂化
卤化物
离子键合
纳米技术
相容性(地球化学)
电化学
深共晶溶剂
溶剂
电压
冶金
作者
Ao Xu,Zhao Li,Jingyuan Yu,Wei Deng,Jingni Li,Hong Zhang,Hantao Xu,Lin Xu
出处
期刊:Angewandte Chemie
[Wiley]
日期:2025-09-23
卷期号:64 (47): e202506058-e202506058
被引量:2
标识
DOI:10.1002/anie.202506058
摘要
Deep eutectic electrolytes (DEEs) are emerging as a highly promising class of next-generation electrolytes, poised to revolutionize the performance of safe sodium-ion batteries (SIBs). Nevertheless, a significant challenge hindering the progress of SIBs is the scarcity of suitable DEEs capable of harmonizing electrolyte conductivity, interfacial compatibility, and safety. In this study, we have engineered a DEE leveraging the synergistic interplay between Na-bonds and hydrogen bonds, achieved through the integration of N-methylacetamide (NMA) and sodium-difluoro(oxalato)borate (NaDFOB). The findings reveal that the distinctive interaction between the polar C═O group in NMA and Na+ ions, coupled with hydrogen bonding with DFOB- anions, facilitates the formation of the DEE. The designed DEE demonstrates exceptional ionic conductivity (4.03 mS cm-1 at 25 °C), a high oxidation voltage (4.63 V versus Na+/Na), and nonflammability. The unique solvation structure markedly enhances the compatibility of the electrode-electrolyte interface, with the NVP||Na cell exhibiting outstanding cycling performance (86.8% retention after 7000 cycles at 5 C) and superior rate capability. Moreover, the DEEs exhibit robust performance at elevated temperatures (94.3% retention after 120 cycles with NVP||Na cell), and the full cell demonstrates significant enhancements in both cycle stability (90.7% retention after 300 cycles) and rate performance. The incorporation of amide-based eutectic electrolytes into SIBs infuses fresh vitality into electrolyte design, propelling the advancement of high-performance SIBs.
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