Cation–Anion Regulation Engineering in a Flame-Retardant Electrolyte toward Safe Na-Ion Batteries with Appealing Stability

Great electrochemical stability and intrinsic safety are of critical significance in realizing large-scale applications of Na-ion batteries (NIBs). Unfortunately, the notorious decomposition of the electrolyte and undesirable side reactions on the cathode–electrolyte interphase (CEI) pose major obstacles to the practical implementation of NIBs. Besides, the flammability of traditional carbonate-based electrolytes raises increasing safety concerns about the batteries. Herein, a flame-retardant all-fluorinated electrolyte is proposed to achieve an anion-aggregated inner solvation shell by modulating cation–anion interactions through a low-coordination number cosolvent. The more electrochemically antioxidant…

• CA
  China Association for Science and Technology
• NN
  National Natural Science Foundation of China

  Awards: 22409161, 52203296, 52472249
• SK
  State Key Laboratory of Electrical Insulation and Power Equipment

  Award: EIPE23313