Fusible orthoborate lithium salt with high conductivity in solutions

Wu Xu, Charles Angell

Research output: Contribution to journalArticlepeer-review

66 Scopus citations


Synthesis, analysis, and electrochemical properties of a new lithium salt with an exceptionally large, weakly coordinating anion, lithium bis {1,2-tetra(trifluoromethyl) ethylenediolato (2-)-O,O′} borate {LiB[OC(CF3)2]4}, are described. This salt, whose anion contains 24 fluorine atoms, can be fused at remarkably low temperatures (120 °C) and is stable up to 280 °C. The salt has a low conductivity in the molten state, only 7.1×10-6 S cm-1 at the melting point of 120 °C due to its quasi-molecular character. However, its solutions in molecular solvents are extremely conductive. The maximum conductivity of LiB[OC(CF3)2]4 in dimethoxyethane (DME) is 11.1×10-3 S cm-1 at 25 °C. The electrochemical stability for each of the DME and propylene carbonate solutions is at least 4.5 V vs. Li+/Li.

Original languageEnglish (US)
Pages (from-to)366-368
Number of pages3
JournalElectrochemical and Solid-State Letters
Issue number8
StatePublished - Aug 1 2000

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Materials Science
  • Physical and Theoretical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering


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