Sulfone-carbonate ternary electrolyte with further increased capacity retention and burn resistance for high voltage lithium ion batteries

Leigang Xue, Seung Yul Lee, Zuofeng Zhao, Charles Angell

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Abstract Safety and high energy density are the two focus issues for current lithium ion batteries. For safety, it has been demonstrated that sulfone electrolytes are much less flammable than the prevailing all-carbonate type, and they are also promising for high voltage batteries due to the high oxidization resistance. However, the high melting points and viscosities greatly restricted their application. Based on our previous work on use of fluidity-enhancing cosolvents to make binary sulfone-carbonate electrolytes, we report here a three-component system that is more conductive and should be even less flammable while additionally having better low temperature stability. The conductivity-viscosity relations have been determined for this electrolyte and are comparable to those of the "standard" carbonate electrolyte. The additional component also produces much improved capacity retention for the LiNi<inf>0.5</inf>Mn<inf>1.5</inf>O<inf>4</inf> cathode. As with carbonate electrolytes, increase of temperature to 55°C leads to rapid capacity decrease during cycling, but the capacity loss is due to the salt, not the solvent. The high discharge capacity observed at 25°C when LiBF<inf>4</inf> replaces LiPF<inf>6</inf>, is fully retained at 55°C.

Original languageEnglish (US)
Article number21396
Pages (from-to)190-196
Number of pages7
JournalJournal of Power Sources
Volume295
DOIs
StatePublished - Jul 14 2015

Keywords

  • Electrolytes
  • High voltage
  • Lithium ion battery
  • Low flammability
  • Sulfone eutectic

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

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