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Nonflammable perfluoropolyether-based electrolytes for lithium batteries.

  • Author(s): Wong, Dominica HC
  • Thelen, Jacob L
  • Fu, Yanbao
  • Devaux, Didier
  • Pandya, Ashish A
  • Battaglia, Vincent S
  • Balsara, Nitash P
  • DeSimone, Joseph M
  • 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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