Sealed zinc secondary battery and zinc electrode therefor
First Claim
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1. Apparatus comprising:
- at least one zinc negative electrode, said zinc negative electrode including;
a zinc active material;
Ca(OH)2 material present in an amount in the range of 15-40 percent of the weight of said zinc negative electrode; and
a conductive matrix including a metallic oxide material which is more electropositive than zinc, which is one of PbO, Bi2 O3, CdO, Ga2 O3 and Tl2 O3, and which is present in an amount in the range of 5-20 percent of the weight of said zinc negative electrode;
said zinc negative electrode further including a porous hydrophobic element and being formed by first and second electrode assemblies with said porous hydrophobic element disposed therebetween, each of said first and second electrode assemblies comprising;
an active element containing a part of said zinc active material, Ca(OH)2 material and metallic oxide material;
a current collector element having a first face abutting said active element; and
a gas recombination catalytic element containing a metallic oxide which is more electro-positive than zinc and has a chemical or electrochemical affinity for oxygen, said gas recombination catalytic element abutting a second face of said current collector element and abutting said porous hydrophobic element;
an electrolyte containing an electrolyte constituent which is 5-20 percent of the weight of said electrolyte;
at least one positive electrode; and
a container in which is disposed each said zinc negative electrode, each said positive electrode and said electrolyte.
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Abstract
A zinc negative electrode comprising a zinc active material, Ca(OH)2 and a conductive matrix including a metallic oxide which is more electropositive than zinc. The zinc negative electrode is incorporated into a zinc secondary battery having an electrolyte whose electrolyte constituent is a low percentage of the electrolyte. The zinc negative electrode is split into electrode assemblies separated by a porous hydrophobic element.
19 Citations
28 Claims
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1. Apparatus comprising:
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at least one zinc negative electrode, said zinc negative electrode including;
a zinc active material;
Ca(OH)2 material present in an amount in the range of 15-40 percent of the weight of said zinc negative electrode; and
a conductive matrix including a metallic oxide material which is more electropositive than zinc, which is one of PbO, Bi2 O3, CdO, Ga2 O3 and Tl2 O3, and which is present in an amount in the range of 5-20 percent of the weight of said zinc negative electrode;said zinc negative electrode further including a porous hydrophobic element and being formed by first and second electrode assemblies with said porous hydrophobic element disposed therebetween, each of said first and second electrode assemblies comprising;
an active element containing a part of said zinc active material, Ca(OH)2 material and metallic oxide material;
a current collector element having a first face abutting said active element; and
a gas recombination catalytic element containing a metallic oxide which is more electro-positive than zinc and has a chemical or electrochemical affinity for oxygen, said gas recombination catalytic element abutting a second face of said current collector element and abutting said porous hydrophobic element;an electrolyte containing an electrolyte constituent which is 5-20 percent of the weight of said electrolyte; at least one positive electrode; and a container in which is disposed each said zinc negative electrode, each said positive electrode and said electrolyte. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Apparatus comprising:
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at least one zinc negative electrode, said zinc negative electrode including;
a zinc-active material;
a Ca(OH)2 material; and
a conductive matrix including a metallic oxide which is more electropositive than zinc;said zinc negative electrode further including a porous hydrophobic element and being formed by first and second electrode assemblies with said porous hydrophobic element disposed therebetween, each of said first and second electrode assemblies comprising;
an active element containing part of said zinc active material, Ca(OH)2 material and metallic oxide material;
a current collector element having a first face abutting said active element; and
a gas recombination catalytic element containing a metallic oxide which is more electro-positive than zinc and has a chemical or electrochemical affinity for oxygen, said gas recombination catalytic element abutting a second face of said current collector element and abutting said porous hydrophobic element;an electrolyte; at least one positive electrode; and a container in which is disposed each said zinc negative electrode, each said positive electrode and said electrolyte. - View Dependent Claims (10, 11, 12, 13, 14)
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15. Apparatus comprising:
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at least one zinc negative electrode, said zinc negative electrode including;
a zinc-active material;
a Ca(OH)2 material; and
a conductive matrix including a metallic oxide which is more electropositive than zinc;said zinc negative electrode further including a porous hydrophobic element and being formed by first and second electrode assemblies with said porous hydrophobic element disposed therebetween, each of said first and second electrode assemblies comprising;
an active element containing a part of said zinc active material, Ca(OH)2 material and metallic oxide material;
a current collector element having a first face abutting said active element; and
a gas recombination catalytic element containing a metallic oxide which is more electro-positive than zinc and has a chemical or electrochemical affinity for oxygen, said gas recombination catalytic element abutting a second face of said current collector element and abutting said porous hydrophobic element;and at least one positive electrode.
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16. Apparatus comprising:
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at least one zinc negative electrode, said zinc negative electrode including;
a zinc-active material;
a Ca(OH)2 material; and
a conductive matrix including a metallic oxide which is more electropositive than zinc;said zinc negative electrode further including a porous hydrophobic element and being formed by first and second electrode assemblies with said porous hydrophobic element disposed therebetween, each of said first and second electrode assemblies comprising;
an active element containing a part of said zinc active material, Ca(OH)2 material and metallic oxide material;
a current collector element having a first face abutting said active element; and
a gas recombination catalytic element containing a metallic oxide which is more electro-positive than zinc and has a chemical or electrochemical affinity for oxygen, said gas recombination catalytic element abutting a second face of said current collector element and abutting said porous hydrophobic element;at least one positive electrode; and a container in which is disposed each said zinc negative electrode and each said positive electrode. - View Dependent Claims (17, 18, 19)
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20. Apparatus comprising:
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at least one zinc negative electrode, said zinc negative electrode including;
a zinc-active material;
a Ca(OH)2 material; and
a conductive matrix including a metallic oxide which is more electropositive than zinc;said zinc negative electrode further including a porous hydrophobic element and being formed by first and second electrode assemblies with said porous hydrophobic element disposed therebetween, each said first and second electrode assemblies comprising an active element containing a part of said zinc active material, Ca(OH)2 material and metallic oxide material;
a current collector element having a first face abutting said active element; and
a gas recombination catalytic element containing a metallic oxide which is more electropositive than zinc and has a chemical or electrochemical affinity for oxygen, said gas recombination catalytic element abutting a second face of said current collector element and said porous hydrophobic element. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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Specification