Slurry for use in rechargeable metal-air batteries
AssigneeElectric Fuel Limited
InventorsJonathan Goldstein, Arieh Meitay
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Abstract
A slurry for use in metal-air batteries comprises an admixture of particulate porous zinc, an aqueous solution of at least one Group Ia metal hydroxide, an inorganic inhibitor ingredient effective to inhibit the interaction of porous zinc with the Group Ia metal hydroxide which would otherwise result in the evolution of hydrogen gas, a gelling agent, a particulate and/or fibrous filler, a labelling agent, and a dissolved electrolyte extender.
Claims43
A slurry for use in rechargeable metal-air batteries, comprising particulate porous zinc containing material of a particle size within the range of 100-500 microns and having density within the range of 0.3-1.4 g./cc and a surface area within the range of 0.5-6.0 m.sup.2 /g, an aqueous solution of at least one Group Ia metal hydroxide, and an inorganic inhibitor ingredient effective to inhibit interaction of said particulate porous zinc containing material and said aqueous solution to prevent evolution of hydrogen gas, wherein the weight ratio in said slurry between said porous zinc containing material, said aqueous solution and said inorganic inhibitor is 1:0.5-2.0:0.0005-0.04.
A slurry for use in rechargeable metal-air batteries, comprising particulate porous zinc containing material selected from the group consisting of porous zinc and a particulate inert substrate coated with porous zinc and having a particle size within the range of 100-500 microns, a density within the range of 0.3-1.4g./cc and a surface area within the range of 0.5-6.0m.sup.2 /g, an 4-12 moles/liter aqueous solution of potassium hydroxide, an inorganic inhibitor ingredient effective to inhibit interaction of said particulate porous zinc containing material and said aqueous solution to prevent evolution of hydrogen gas, a gelling agent, a filler selected from the group consisting of particulate and fibrous fillers, a labelling agent and a dissolved electrolyte extender, wherein the weight ratio between said porous zinc containing material, said aqueous solution and said inorganic inhibitor is 1:0.5-2.0:0.0005-0.04 and the slurry contains 0.3-3.0% by weight of said gelling agent, 1.0-10.0% by weight of said filler, 0.001-10% by weight of said labelling agent and 0.1-10.0% of said electrolyte extender, and the amount of zinc in the slurry is within the range of 33.3-67% by weight.
A slurry according to claim 48, wherein said labelling agent is selected from the group consisting of Cresol Red, sodium fluorescein and nylon-, polypropylene-, polyvinyl chloride- and polytertrafluoroethylene-encapsulated Fe.sub.3 O.sub.4.
A slurry for use in rechargeable metal-air batteries, comprising particulate porous zinc containing material selected from the group consisting of porous zinc and a particulate inert substrate coated with porous zinc, and being of a particle size within the range of 100-500 microns and having a surface area within the range of 0.5-6.0m.sup.2 /g, said porous zinc having a density which is 5-20% of the density of non-porous zinc and said particulate inert substrate having a particle size falling within the range of 10-250 microns, an 4-12 moles/liter aqueous solution of potassium hydroxide, and an inorganic inhibitor ingredient effective to inhibit an interaction between said particulate porous zinc containing material and said aqueous solution to prevent an evolution of hydrogen gas, wherein the slurry contains 33.3 to 67.0 percent by weight of zinc and the weight ratio between said porous zinc containing material, said aqueous solution and said inorganic inhibitor is 1:0.5-2.0:
- 0.0005-0.04.
Dependencies are inferred from the claim text.