Synthesis and Electrolyte Study of Lithium Bis(perfluorinated pinacolato)Borate for Lithium‐Ion Batteries
Lithium-ion batteries are the leading rechargeable battery technology. 1 M lithium hexafluorophosphate (LiPF<sub>6</sub>) dissolved in carbonate solvents is commonly used as the electrolyte; however, LiPF<sub>6</sub> 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)<sub>2</sub>]·xDME (x = 0 or 1, pp = perfluorinated pinacolato, O<sub>2</sub>C<sub>2</sub>(CF<sub>3</sub>)<sub>4</sub>), which exhibit superior air tolerance and have higher thermal stability than LiPF<sub>6</sub>. Lithium-ion cycling using 1 M Li[B(pp)<sub>2</sub>]·DME and 0.2 M Li[B(pp)<sub>2</sub>] electrolyte salts was performed, where 0.2 M Li[B(pp)<sub>2</sub>] cycled with higher capacity than 1 M Li[B(pp)<sub>2</sub>]·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)<sub>2</sub>]·DME than for LiPF<sub>6</sub> based electrolyte.
Authors
- Dominic S. Wright (ORCID: https://orcid.org/0000-0002-9952-3877)
- Megan E. Penrod (ORCID: https://orcid.org/0000-0002-5946-4972)
- Robert S. Weatherup (ORCID: https://orcid.org/0000-0002-3993-9045)
- Clare P. Grey (ORCID: https://orcid.org/0000-0002-9488-1739)
- Zachary Ruff (ORCID: https://orcid.org/0000-0001-9097-3735)
- Pravin N. Didwal (ORCID: https://orcid.org/0000-0002-7620-4769)
- Darren M. C. Ould
- Kieran Mylrea
- Andrew D. Bond (ORCID: https://orcid.org/0000-0002-1744-0489)
- Holly Smith
Institutions
- University of Cambridge (GB)
- University of Oxford (GB)
- The Faraday Institution (GB)
Publication Details
- Journal
- Chemistry - A European Journal
- Published
- 2025-11-19
- DOI
- https://doi.org/10.1002/chem.202502653
- Primary Topic
- Advancements in Battery Materials
- Type
- article
- Field-Weighted Citation Impact
- 0.00