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Nonflammable perfluoropolyether-based electrolytes for lithium batteries

  • Author(s): Wong, DHC
  • Thelen, JL
  • Fu, Y
  • Devaux, D
  • Pandya, AA
  • Battaglia, VS
  • Balsara, NP
  • DeSimone, JM
  • et al.
Abstract

The flammability of conventional alkyl carbonate electrolytes hinders the integration of large-scale lithium-ion batteries in transportation and grid storage applications. In this study, we have prepared a unique nonflammable electrolyte composed of low molecular weight perfluoropolyethers and bis(trifluoromethane)sulfonimide lithium salt. These electrolytes exhibit thermal stability beyond 200 °C and a remarkably high transference number of at least 0.91 (more than double that of conventional electrolytes). Li/LiNi1/3Co1/3Mn1/3O2 cells made with this electrolyte show good performance in galvanostatic cycling, confirming their potential as rechargeable lithium batteries with enhanced safety and longevity.

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