近日，武汉理工大学徐林团队研究了高性能钠离子电池用不燃深共晶电解液的协同配位效应。该研究于2025年9月23日发表在《德国应用化学》杂志上。

深共晶电解质（DEEs）作为一种极具潜力的下一代电解质体系，正引领安全型钠离子电池（SIBs）的性能革新。然而，当前制约SIBs发展的关键挑战在于难以找到同时兼顾导电性、界面相容性与安全性的DEEs。

研究组通过整合N-甲基乙酰胺（NMA）与二氟草酸硼酸钠（NaDFOB），利用钠键与氢键的协同作用构建了一种新型DEE。结果发现，NMA中极性C=O基团与Na⁺离子的特异性相互作用，结合DFOB⁻阴离子的氢键效应，共同促进了DEE的形成。所设计的DEE展现出卓越的离子电导率（25°C下达4.03 mS cm⁻¹）、高氧化电压（相对于Na⁺/Na为4.63 V）及不燃特性。

独特的溶剂化结构显著提升了电极-电解质界面相容性，NVP||Na电池表现出优异的循环性能（5 C倍率下循环7000次容量保持率86.8%）和倍率特性。此外，该DEE在高温环境下仍保持稳定性能（NVP||Na电池循环120次容量保持率94.3%），全电池的循环稳定性（300次循环后保持率90.7%）与倍率性能均实现显著提升。将酰胺基深共晶电解质引入SIBs体系，为电解质设计注入了新活力，推动着高性能SIBs的发展进程。

附：英文原文

Title: Synergic Coordination Effect in Nonflammable Deep Eutectic Electrolyte for High-Performance Sodium-Ion Batteries

Author: Ao Xu, Li Zhao, Jingyuan Yu, Wei Deng, Jingni Li, Hong Zhang, Hantao Xu, Lin Xu

Issue&Volume: 2025-09-23

Abstract: 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 cm1 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.

DOI: 10.1002/anie.202506058

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202506058