Abstract: A method for preparing a separator of a battery comprises the steps of: respectively stretching a first polypropylene film and a second polypropylene film in one direction at ?3-7° C., and keeping at 45-60° C. to provide a first polypropylene microporous film and a second polypropylene microporous film; perpendicularly compounding the films along the stretching direction to provide a polypropylene microporous composite film; and subjecting the polypropylene microporous composite film to hydrophilic treatment to provide the separator of the battery. The through micro-pores in the first and the second polypropylene film in the invention are attached and staggered to form tortuous pores, which greatly reduce the aperture of the through pores. Therefore, the passing of fine zinc particles and zincate can be blocked without influence on the passing of organic ions and the penetration of dendritic crystals is avoided.

Abstract: The present invention provides a nickel-zinc secondary battery, including: a battery case; an electrode assembly, disposed in the battery case; and an electrolyte solution, positioned in the battery case, and filled around the electrode assembly, wherein the electrode assembly includes a nickel positive electrode, a zinc negative electrode, and a membrane separator disposed between the nickel positive electrode and the zinc negative electrode; the nickel positive electrode includes: a substrate and positive electrode material coated on the surface of the substrate; the positive electrode material includes: 68 wt %˜69 wt % positive electrode active material, 0.6 wt %˜1 wt % yttrium oxide, 0.2 wt %˜0.6 wt % calcium hydroxide, 3.5 wt %˜4 wt % nickel powder, and a binder in balance; and the positive electrode active material is a spherical nickel hydroxide coated with Co3+.

Abstract: The present invention provides a positive electrode material for a nickel-zinc secondary battery, a positive electrode for a nickel-zinc secondary battery and a method for preparing the positive electrode. The positive electrode material for a nickel-zinc secondary battery provided by the present invention includes: 68 wt %˜69 wt % positive electrode active material, 0.6 wt %˜1 wt % yttrium oxide, 0.2 wt %˜0.6 wt % calcium hydroxide, 3.5 wt %˜4 wt % nickel powder, and a binder in balance; the positive electrode active material being a spherical nickel hydroxide coated with Co (III). The positive electrode material for a nickel-zinc secondary battery provided by the present invention contains no Co(II) ion and cadmium ion. The positive electrode prepared by the positive electrode material provided by the present invention can reduce the amount of hydrogen evolved in the battery while ensuring relatively high electrode charging/discharging capacity.

Abstract: The present invention provides a nickel-zinc secondary battery, including: a battery case; an electrode assembly, disposed in the battery case; and an electrolyte solution, positioned in the battery case, and filled around the electrode assembly, wherein the electrode assembly includes a nickel positive electrode, a zinc negative electrode, and a membrane separator disposed between the nickel positive electrode and the zinc negative electrode; the nickel positive electrode includes: a substrate and positive electrode material coated on the surface of the substrate; the positive electrode material includes: 68 wt %˜69 wt % positive electrode active material, 0.6 wt %˜1 wt % yttrium oxide, 0.2 wt %˜0.6 wt % calcium hydroxide, 3.5 wt %˜4 wt % nickel powder, and a binder in balance; and the positive electrode active material is a spherical nickel hydroxide coated with Co3+.

Abstract: A method for preparing a separator of a battery comprises the steps of: respectively stretching a first polypropylene film and a second polypropylene film in one direction at ?3-7° C., and keeping at 45-60° C. to provide a first polypropylene microporous film and a second polypropylene microporous film; perpendicularly compounding the films along the stretching direction to provide a polypropylene microporous composite film; and subjecting the polypropylene microporous composite film to hydrophilic treatment to provide the separator of the battery. The through micro-pores in the first and the second polypropylene film in the invention are attached and staggered to form tortuous pores, which greatly reduce the aperture of the through pores. Therefore, the passing of fine zinc particles and zincate can be blocked without influence on the passing of organic ions and the penetration of dendritic crystals is avoided.

Abstract: The present invention provides a tilted-grid substrate of a negative electrode for a nickel-zinc battery, including a first zinc foil layer; a copper foil layer compounded on the first zinc foil layer; and a second zinc foil layer compounded on the copper foil layer. The present invention further provides an active material composition of a negative electrode for a nickel-zinc battery, a negative electrode for a nickel-zinc battery, the method for preparing the negative electrode, and a nickel-zinc battery. In the tilted-grid substrate of a negative electrode according to the present invention, the surface of zinc eliminates the needs for plating other metal, avoiding the incorporation of impurities.

Abstract: The present invention provides a positive electrode material for a nickel-zinc secondary battery, a positive electrode for a nickel-zinc secondary battery and a method for preparing the positive electrode. The positive electrode material for a nickel-zinc secondary battery provided by the present invention includes: 68 wt %˜69 wt % positive electrode active material, 0.6 wt %˜1 wt % yttrium oxide, 0.2 wt %˜0.6 wt % calcium hydroxide, 3.5 wt %˜4 wt % nickel powder, and a binder in balance; the positive electrode active material being a spherical nickel hydroxide coated with Co (III). The positive electrode material for a nickel-zinc secondary battery provided by the present invention contains no Co(II) ion and cadmium ion. The positive electrode prepared by the positive electrode material provided by the present invention can reduce the amount of hydrogen evolved in the battery while ensuring relatively high electrode charging/discharging capacity.