Provided is a hydroxide ion-conductive separator including a porous substrate and a layered double hydroxide (LDH)-like compound filling pores of the porous substrate, wherein the LDH-like compound is a hydroxide and/or an oxide with a layered crystal structure, containing: Mg; and one or more elements, which include at least Ti, selected from the group consisting of Ti, Y, and Al.

Provided is a hydroxide ion-conductive separator including a porous substrate and a layered double hydroxide (LDH)-like compound filling pores of the porous substrate, wherein the LDH-like compound is a hydroxide and/or an oxide with a layered crystal structure, containing: Mg; and one or more elements, which include at least Ti, selected from the group consisting of Ti, Y, and Al.

Provided is a secondary battery including a hydroxide-ion-conductive ceramic separator. The secondary battery includes a positive electrode; a negative electrode; an alkaline electrolytic solution; a ceramic separator that is composed of a hydroxide-ion-conductive inorganic solid electrolyte and separates the positive electrode from the negative electrode; a porous substrate disposed on at least one surface of the ceramic separator; and a container accommodating at least the negative electrode and the alkaline electrolytic solution, wherein the inorganic solid electrolyte is in the form of a membrane or layer densified enough to have water impermeability, and the porous substrate has a thickness of 100 to 1,800 μm. According to the secondary battery of the present invention, the thickness and resistance of the ceramic separator are decreased without concern for reduced strength, and a reduction in energy density and an increase in internal resistance are effectively prevented.

Provided is a secondary battery including a hydroxide-ion-conductive ceramic separator. The secondary battery includes a positive electrode; a negative electrode; an alkaline electrolytic solution; a ceramic separator that is composed of a hydroxide-ion-conductive inorganic solid electrolyte and separates the positive electrode from the negative electrode; a porous substrate disposed on at least one surface of the ceramic separator; and a container accommodating at least the negative electrode and the alkaline electrolytic solution, wherein the inorganic solid electrolyte is in the form of a membrane or layer densified enough to have water impermeability, and the porous substrate has a thickness of 100 to 1,800 μm. According to the secondary battery of the present invention, the thickness and resistance of the ceramic separator are decreased without concern for reduced strength, and a reduction in energy density and an increase in internal resistance are effectively prevented.

The disclosure relates to a method for the fabrication of a thin-film solid-state battery with Ni(OH).sub.2 electrode, battery cell, and battery. One example embodiment is a method for fabricating a thin-film solid-state battery cell on a substrate comprising a first current collector layer. The method includes depositing above the first current collector layer a first electrode layer. The first electrode layer is a nanoporous composite layer that includes a plurality of pores having pore walls. The first electrode layer includes a mixture of a dielectric material and an active electrode material. The method also includes depositing above the first electrode layer a porous dielectric layer. The method further includes depositing directly on the porous dielectric layer a second electrode layer. Depositing the second electrode layer includes depositing a porous Ni(OH).sub.2 layer using an electrochemical deposition process.

Provided is a zinc-air secondary battery including an air electrode; a negative electrode containing zinc, a zinc alloy, and/or a zinc compound; an aqueous electrolytic solution in which the negative electrode is immersed; a container having an opening and accommodating the negative electrode and the electrolytic solution; and a separator disposed to cover the opening and having hydroxide ion conductivity, water impermeability, and gas impermeability, the separator being in contact with the electrolytic solution and defining a hermetic space with the container such that the air electrode is separated from the electrolytic solution by the separator through which hydroxide ions pass. The hermetic space has an extra space having a volume that meets a variation in amount of water in association with reaction at the negative electrode during charge and discharge of the battery. The present invention provides a highly reliable zinc-air secondary battery.

Provided is a zinc-air secondary battery including an air electrode; a negative electrode containing zinc, a zinc alloy, and/or a zinc compound; an aqueous electrolytic solution in which the negative electrode is immersed; a container having an opening and accommodating the negative electrode and the electrolytic solution; and a separator disposed to cover the opening and having hydroxide ion conductivity, water impermeability, and gas impermeability, the separator being in contact with the electrolytic solution and defining a hermetic space with the container such that the air electrode is separated from the electrolytic solution by the separator through which hydroxide ions pass. The hermetic space has an extra space having a volume that meets a variation in amount of water in association with reaction at the negative electrode during charge and discharge of the battery. The present invention provides a highly reliable zinc-air secondary battery.

An improved method for manufacturing alkaline (e.g., zinc-manganese dioxide) electrochemical cells and a corresponding anode formulation are disclosed. In particular, zinc and a mixture of gelling agents are employed to better control the manufacturing conditions and to improve the overall performance of the resulting battery. The gelling agents are selected to have differences in resistivity, viscosity and polymerization/cross-linking. The zinc may be of any type, as is known in the art.

An improved method for manufacturing alkaline (e.g., zinc-manganese dioxide) electrochemical cells and a corresponding anode formulation are disclosed. In particular, zinc and a mixture of gelling agents are employed to better control the manufacturing conditions and to improve the overall performance of the resulting battery. The gelling agents are selected to have differences in resistivity, viscosity and polymerization/cross-linking. The zinc may be of any type, as is known in the art.

A secondary battery includes a positive electrode, a negative electrode and an electrolyte containing aqueous electrolyte. The negative electrode is provided with a negative electrode current collector having a compound including aluminum, and a negative electrode active material including titanium on a granule surface of the negative electrode current collector. A ratio of an atomic concentration of aluminum atoms to sum of atomic concentrations of aluminum atoms and titanium atoms on a surface of the negative electrode ({Al atomic concentration/(Al atomic concentration+Ti atomic concentration)}×100) is 3 atm % or more and 30 atm % or less.