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Lithium ion polymer electrolytes

  • US 6,413,676 B1
  • Filed: 06/28/1999
  • Issued: 07/02/2002
  • Est. Priority Date: 06/28/1999
  • Status: Expired due to Fees
First Claim
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1. A thin film solid polymer electrolyte for a lithium ion battery, comprising:

  • a solid base polymer material of less than about 25 microns in thickness, comprising a hybrid copolymer of at least two polymers homogeneously blended in non-discrete phase and dissolved in solid solution with a solvent, one of said two polymers being polyvinylidene fluoride (PVDF), selected from a polar group having pronounced solvent retention properties, and the other of said two polymers being selected from a second group to provide properties of enhanced strength and improved processing capability of said solid base polymer material, said second group consisting of polyester (PET), polypropylene (PP), polyethylene napthalate (PEN), polycarbonate (PC), polyphenylene sulfide (PPS), and polytetrafluoroethylene (PTFE), or a combination of two or more members thereof; and

    a liquid electrolyte solution containing a lithium salt absorbed within pores of said solid base polymer material.

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