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US 7,598,000 B1Granted
Alkali-hydroxide modified poly-vinylidene fluoride/polyethylene oxide protective polymer blend coating for lithium metal
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsYuk Chan, Terrill B. Atwater
Life of this patent
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Abstract
An anode for a metal-air battery has an electrode and a metal foil interconnected with the electrode. A barrier layer surrounds the metal foil and includes a polymer blend that substantially reduces the passage of moisture therethrough while permitting the passage of ions therethrough. A method of making the barrier layer is also presented.
Claims7
An anode for a lithium battery with a plurality of solid, polymeric blend, protective barrier layers, comprising:
- a terminal;
- a wire-mesh layer interposed between said terminal and a one of said plurality of barrier layers;
- a metal foil layer is wrapped around said wire-mesh layer and surrounded by another one of said plurality of barrier layers;
- said wire-mesh layer and said metal foil layer being connected to said terminal;
- said plurality of barrier layers being composed of a mixture of an alkali-hydroxide modified polyvinylidene fluoride, polyethylene oxide, and lithium hexafluorophosphate;
- said alkali-hydroxide modified polyvinylidene fluoride being in a range of between approximately 75 percent by weight and 85 percent by weight;
- said polyethylene oxide being in a range of between approximately 5 percent by weight and 10 percent by weight;
- said lithium hexafluorophosphate being in a range of between approximately 10 percent by weight and 15 percent by weight;
- and
- said plurality of barrier layers allow passage of lithium ions and oxygen ions therethrough to said metal foil layer providing a multitude of oxidation reactions and reduction reactions and prevents unwanted contact between external moisture and said metal foil layer to generate electrical energy in said lithium battery at an increased level of stability.
7 more elements
A solid, polymeric blend, protective barrier layer for an anode of a lithium metal-air battery, comprising:
- said anode having a terminal, a wire-mesh layer, and a metal foil layer,
- said wire-mesh layer being interposed between said terminal and said barrier layer;
- said metal foil layer being wrapped around said wire-mesh layer and surrounded by said barrier layer;
- said wire-mesh layer and said metal foil layer being connected to said terminal;
- said barrier layer being composed of a mixture of an alkali-hydroxide modified polyvinylidene fluoride, polyethylene oxide and lithium hexafluorophosphate;
- said alkali-hydroxide modified polyvinylidene fluoride being in a range of between approximately 75 percent by weight and 85 percent by weight;
- said polyethylene oxide being in a range of between approximately 10 percent by weight and 15 percent by weight;
- said lithium hexafluorophosphate being in a range of between approximately 10 percent by weight and 15 percent by weight;
- said barrier layer being subdivided into a plurality of barrier layers;
- and
- said plurality of barrier layers allow passage of lithium ions and oxygen ions therethrough to said metal foil layer providing a multitude of oxidation reactions and reduction reactions and prevents unwanted contact between external moisture and said metal foil layer to generate electrical energy in said battery at an increased level of stability.
8 more elements
Dependencies are inferred from the claim text.