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Ionically conductive polymer electrolytes

  • US 6,828,065 B2
  • Filed: 07/02/2002
  • Issued: 12/07/2004
  • Est. Priority Date: 06/28/1999
  • Status: Expired due to Fees
First Claim
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1. An ionically conductive polymer electrolyte, comprisingat least two constituent polymers homogeneously mixed in a hybrid copolymer solid solution blend of predominantly amorphous structure constituting a base polymer, one of said constituent polymers selected from a polar group of polymers adapted for pronounced solvent retention. another of said constituent polymers selected from a group consisting of one or more of polyester (PET) polypropylene (PP), polyethylene napthalate (PEN), polycarbonate (PC), polyphenylene sulfide (PPS), and polytetrafluoroethylene (PTFE) in a ratio of concentrations of said constituent polymers in said solid solution to infuse said base polymer with a predetermined property among enhanced strength, processing capability, thermal stability, and mechanical stability, and an electrolyte solution heavily absorbed within said base polymer without substantial swelling thereof, wherein said hybrid copolymer solid solution blend comprises a thin film that includes:

  • a very high surface area inorganic filler consisting of one of fumed silica or alumina in a concentration range from about 0.1% to about 30% by weight dispersed into said hybrid copolymer solid solution blend to create porosity therein and to enhance the mechanical stability of said thin film; and

    said electrolyte solution is a liquid solvent electrolyte absorbed into said thin film.

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