Work

Synthesis and Electrolyte Study of Lithium Bis(perfluorinated pinacolato)Borate for Lithium‐Ion Batteries

Year: 2025

Type: article

Abstract: Lithium‐ion batteries are the leading rechargeable battery technology. 1 M lithium hexafluorophosphate (LiPF 6 ) dissolved in carbonate solvents is commonly used as the electrolyte; however, LiPF 6 is hygroscopic and forms toxic HF in the presence of water. This work presents the synthesis of lithium bis(perfluorinated pinacolato)borate salts Li[B(pp) 2 ]· x DME ( x = 0 or 1, pp = perfluorinated pinacolato, O 2 C 2 (CF 3 ) 4 ), which exhibit superior air tolerance and have higher thermal stability than LiPF 6 . Lithium‐ion cycling using 1 M Li[B(pp) 2 ]·DME and 0.2 M Li[B(pp) 2 ] electrolyte salts was performed, where 0.2 M Li[B(pp) 2 ] cycled with higher capacity than 1 M Li[B(pp) 2 ]·DME. X‐ray photoelectron spectroscopy on the post‐cycled NMC cathode found a thicker cathode electrolyte interphase with less LiF when using Li[B(pp) 2 ]·DME than for LiPF 6 based electrolyte.

Source: Chemistry - A European Journal

DOI: 10.1002/chem.202502653