Nonflammable Succinonitrile‐Based Deep Eutectic Electrolyte for Intrinsically Safe High‐Voltage Sodium‐Ion Batteries

Abstract Intrinsically safe sodium‐ion batteries are considered as a promising candidate for large‐scale energy storage systems. However, the high flammability of conventional electrolytes may pose serious safety threats and even explosions. Herein, a strategy of constructing a deep eutectic electrolyte is proposed to boost the safety and electrochemical performance of succinonitrile (SN)‐based electrolyte. The strong hydrogen bond between S═O of 1,3,2‐dioxathiolane‐2,2‐dioxide (DTD) and the α‐H of SN endows the enhanced safety and compatibility of SN with Lewis bases. Meanwhile, the DTD participates in the inner Na + sheath and weakens the coordination number of SN. The unique solvation configuration promotes…

• NN
  National Natural Science Foundation of China

  Awards: 52202286, 52250710680, 22309002, 52171217
• SG
  State Grid Corporation of China

  Award: 202158503A-0-5-ZN
• SA
  Science and Technology Project of State Grid

  Award: 5419-202158503A-0-5-ZN
• SA
  Science and Technology Plan Project of Wenzhou, China

  Award: ZG2022032
• HF
  High-end Foreign Experts Recruitment Plan of China

  Award: G2023016009L
• BR
  Basic Research Project of Wenzhou City

  Award: G20220016
• KR
  Key Research and Development Program of Zhejiang Province

  Awards: 2023C011232, 2024C01057