Methoxyethoxyethoxyphosphazenes as ionic conductive fire retardant additives for lithium battery systems

Shih To Fei, Harry R. Allcock

Research output: Contribution to journalArticlepeer-review

73 Scopus citations


The current highly flammable configurations for rechargeable lithium batteries generate safety concerns. Although commercial fire retardant additives have been investigated, they tend to decrease the overall efficiency of the battery. We report here ionically conductive, non-halogenated lithium battery additives based on a methoxyethoxyethoxyphosphazene oligomer and the corresponding high polymer, which can increase the fire resistance of a battery while retaining a high energy efficiency. Conductivities in the range of 10-4 S cm-1 have been obtained for self-extinguishing, ion-conductive methoxyethoxyethoxyphosphazene oligomers. The addition of 25 wt% high polymeric poly[bis(methoxyethoxyethoxy)phosphazene] to propylene carbonate electrolytes lowers the flammability by 90% while maintaining a good ionic conductivity of 2.5 × 10-3 S cm-1.

Original languageEnglish (US)
Pages (from-to)2082-2088
Number of pages7
JournalJournal of Power Sources
Issue number7
StatePublished - Apr 2 2010

All Science Journal Classification (ASJC) codes

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


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