New electrolytes for lithium ion batteries using LiF salt and boron based anion receptors

L. F. Li, H. S. Lee, H. Li, X. Q. Yang, K. W. Nam, W. S. Yoon, J. McBreen, X. J. Huang

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

The thermal and electrochemical stability, as well as compatibility with various bench mark cathode and anode materialsof two new lithiumfluoride salt (LiF) based electrolytes havebeen studied. These two new electrolytes are formed by using boron-based anion receptors, tris(pentafluorophenyl) borane (TPFPB), or tris(2H-hexafluoroisopropyl) borate (THFPB) as additives, which were designed and synthesized at Brookhaven National Laboratory (BNL), to dissolve the LiF salt in carbonate solvents. The transference number of Li+ for these electrolytes is as high as 0.7 and the room-temperature conductivity is around 2×10-3 S cm-1. The electrolytes containing propylene carbonate (PC) show superior low-temperature conductivity properties. The electrochemical window is approaching 5.0V. It was also found that the new electrolytes work well with LiCoOs2 or LiMn2O4 cathodes. However, when PC containing electrolytes were used, PC co-intercalation is still a problem for graphite anodes. The formation of a stable solid electrolyte interface layer on the surface of anode in this type of electrolyte needs to be studied further.

Original languageEnglish
Pages (from-to)517-521
Number of pages5
JournalJournal of Power Sources
Volume184
Issue number2
DOIs
StatePublished - 1 Oct 2008

Keywords

  • Anion receptor
  • Electrolyte
  • LiF
  • Lithium ion batteries
  • THFPB
  • TPFPB

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