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Alkali-hydroxide modified poly-vinylidene fluoride/polyethylene oxide lithium-air battery

  • US 7,670,724 B1
  • Filed: 01/05/2005
  • Issued: 03/02/2010
  • Est. Priority Date: 01/05/2005
  • Status: Expired due to Fees
First Claim
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1. A moisture-resistant lithium metal-air battery, comprising:

  • a housing having an aperture to permit the passage of air;

    a pair of electrodes extending from the said housing;

    an air cathode interconnected with a one of said pair of electrodes;

    a metal foil anode being interconnected with another one of said pair of electrodes;

    a separator interposed between said air cathode and said metal foil anode; and

    a polymeric barrier layer surrounds said metal foil anode;

    a first wire-mesh layer is disposed adjacent said air cathode;

    a second wire-mesh layer is interposed between said metal foil anode and said polymeric barrier layer;

    said polymeric barrier layer, being composed of a mixture of alkali-hydroxide modified polyvinylidene fluoride, polyethylene oxide, and lithium hexafluorophosphate, allows a passage of lithium ions and oxygen ions therethrough to said metal foil anode;

    said alkali-hydroxide modified polyvinylidene fluoride being in a range of between about 75 percent by weight and about 85 percent by weight;

    said polyethylene oxide being in a range of between about 5 percent by weight and about 10 percent by weight;

    said lithium hexafluorophosphate being in a range of between about 10 percent by weight and about 15 percent by weight; and

    said passage of lithium ions and oxygen ions through said polymeric barrier layer to said metal foil anode causes a multitude of oxidation reactions and reduction reactions while substantially reducing unwanted contact between external moisture and said metal foil anode to generate electrical energy at an increased level of stability.

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