Designing Advanced Electrolytes for High-Safety and Long-Lifetime Sodium-Ion Batteries via Anion–Cation Interaction Modulation

Safety hazards caused by flammable electrolytes have been major obstacles to the practical application of sodium-ion batteries (SIBs). The adoption of nonflammable all-phosphate electrolytes can effectively improve the safety of SIBs; however, traditional low-concentration phosphate electrolytes are not compatible with carbon-based anodes. Herein, we report an anion–cation interaction modulation strategy to design low-concentration phosphate electrolytes with superior physicochemical properties. Tris(2,2,2-trifluoroethyl) phosphate (TFEP) is introduced as a cosolvent to regulate the ion–solvent-coordinated (ISC) structure through enhancing the anion–cation interactions, forming the stable anion-induced ISC…

• NN
  National Natural Science Foundation of China

  Award: U20A20249 and 22209125
• NK
  National Key Research and Development Program of China

  Award: 2021YFB3800300