Insight Into Sulfur‐Containing Additive to Boost Anti‐Oxidation Ability of the Ether‐Based Electrolyte for Sodium‐Ion Full Batteries

Abstract Ether‐based electrolytes are considered as promising candidates for sodium‐ion batteries (SIBs) due to their high ionic conductivity and good compatibility with hard carbon (HC) anode. However, they suffer from poor anti‐oxidative ability with unstable cathode electrolyte interface, inducing successive electrolyte decomposition and rapid capacity fading. Herein, the sulfur‐containing additive (1,3‐propanediol cyclic sulfate, PCS) is introduced to boost the stability of the electrode‐electrolyte interface (EEI) in ether‐based electrolyte. PCS largely participates in the inner Na + sheath, causing more diglyme (G2) molecules and fewer PF 6 ‐ anions to occupy the inner Na + solvation sheath, avoiding the…

• NN
  National Natural Science Foundation of China

  Awards: 52202286, 52250710680, 22309002, 52171217
• CP
  China Postdoctoral Science Foundation

  Award: 2024T170002
• SA
  Science and Technology Plan Project of Wenzhou, China

  Awards: ZG2024055, ZG2022032
• BR
  Basic Research Project of Wenzhou City

  Award: G20220016
• NS
  Natural Science Foundation of Zhejiang Province

  Award: LY24B030006
• KR
  Key Research and Development Program of Zhejiang Province

  Awards: 2023C01232, 2024C01057