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Rare earth-magnesium-nickel system heterogeneous hydrogen storage alloys used for nickel-hydrogen batteries and preparing method thereof

A nickel-metal hydride battery and hydrogen storage alloy technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems affecting the price of final products and high prices, and achieve the goal of improving self-discharge and low-temperature performance, increasing discharge capacity and cycle life. Effect

Active Publication Date: 2014-12-10
SIHUI DABOWEN IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rare earth elements such as Ce, Pr, and Nd are mostly used for replacement on the A side, and the high price of Pr and Nd affects the price of the final product

Method used

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  • Rare earth-magnesium-nickel system heterogeneous hydrogen storage alloys used for nickel-hydrogen batteries and preparing method thereof
  • Rare earth-magnesium-nickel system heterogeneous hydrogen storage alloys used for nickel-hydrogen batteries and preparing method thereof
  • Rare earth-magnesium-nickel system heterogeneous hydrogen storage alloys used for nickel-hydrogen batteries and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0021] According to the structural formula La 0.40 Ce 0.05 SM 0.05 Mg 0.45 Ni 4.30 al 0.20 co 0.40 mn 0.30 Ag 0.15 Weigh the metal raw materials La, Ce, Sm, Mg, Ni, Al, Co, Mn, Ag, put them in the crucible of the induction melting furnace, vacuumize (0.1Pa) and fill it with argon gas. The pressure is 0.1MPa, smelting at 1400K for 20 hours to obtain a metal smelting solution; pour the metal smelting solution into a water-cooled ingot mold and cool to obtain an alloy ingot. Place the alloy ingot in a horizontal heat treatment furnace, vacuumize (0.1Pa) and fill it with protective gas argon, the pressure in the furnace is 0.05MPa, anneal at 1000K for 48 hours, and jet crush to obtain rare earth-magnesium for nickel-metal hydride batteries - Nickel-based multiphase superlattice hydrogen storage alloy. XRD test showed that AB 5 Phase accounted for 10.0%, A 2 B 7 phase accounts for 90.0%, and no other phase exists.

Embodiment 3

[0023] According to the structural formula La 0.45 Ce 0.10 SM 0.10 Mg 0.40 Ni 4.00 al 0.20 co 0.50 mn 0.40 Ge 0.02 Weigh the metal raw materials La, Ce, Sm, Mg, Ni, Al, Co, Mn, Ge, put them all in the crucible of the induction melting furnace, vacuumize (0.1Pa) and fill with argon gas, the furnace The pressure is 0.5 MPa, smelting at 1800K for 6 hours to obtain a metal smelting solution; pour the metal smelting solution into a water-cooled ingot mold and cool to obtain an alloy ingot. The alloy ingot is placed in a horizontal heat treatment furnace, vacuumed (0.1Pa), filled with protective gas argon, the pressure in the furnace is 1MPa, annealed at 1500K for 10h, and jet crushed to obtain rare earth-magnesium- Nickel-based multiphase superlattice hydrogen storage alloy. XRD test showed that AB 5 Phase accounted for 18.5%, A 2 B 7 Phase accounted for 79.8%, the rest with AB 3 、A 5 B 19 , The B-side free phase exists in the form of an impurity phase.

Embodiment 4

[0025] According to the structural formula La 0.50 Ce 0.10 SM 0.10 Mg 0.35 Ni 3.70 Al 0.40 co 0.50 mn 0.40 Sr 0.05 Weigh the metal raw materials La, Ce, Sm, Mg, Ni, Al, Co, Mn, Sr in the molar ratio, put them all in the crucible of the induction melting furnace, vacuumize (0.1Pa) and fill it with argon gas, the furnace The pressure is 0.001MPa, smelting at 2000K for 2 hours to obtain a metal smelting solution; pour the metal smelting solution into a water-cooled ingot mold and cool to obtain an alloy ingot. Place the alloy ingot in a horizontal heat treatment furnace, vacuumize (0.1Pa) and fill it with protective gas argon, the pressure in the furnace is 0.005MPa, anneal at 1800K for 5h, and jet crush to obtain rare earth-magnesium for nickel-metal hydride batteries - Nickel-based multiphase superlattice hydrogen storage alloy. XRD test showed that AB 5 Phase accounted for 27.0%, A 2 B 7 Phase accounted for 71.8%, the rest with AB 3 、A 5 B 19 , The B-side free p...

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Abstract

The invention discloses rare earth-magnesium-nickel system heterogeneous hydrogen storage alloys used for nickel-hydrogen batteries and a preparing method thereof. The alloys are characterized in that: the general structure formula of the alloys is LnMgNi<x>Y<y>Z<z>, wherein the Ln is at least one element selected from rare earth elements; the Y is at least one element selected from a group comprising Co, Mn, Al, Cu, Nb, V, Fe, Zn, Ti, Cr, As, Ga, Mo, Sn, In, W, Si, B and P; the Z is at least one element selected from a group comprising Ag, Sr, Ge and Au; the a is less than 1 and not less than 0.5; the b is less than 0.5 and more than 0; the x is more than 2.5 and less than 4.5; the y is more than 0 and less than 2; the z is more than 0 and not more than 1; an AB5 phase accounts for 10-90%; an A2B7 phase accounts for 10-90%; and the ratio of other impurity phases is not more than 30%. B side elements are replaced by the Ag, the Sr, the Ge, the Au, and the like, alloy components and an annealing process are optimized, and the ratio of the AB5 phase to the A2B7 phase in the product is adjusted, thus increasing the discharge capacity of the hydrogen storage alloy, prolonging the cycle lifetime of the hydrogen storage alloy, and improving self-discharge and low-temperature properties.

Description

Technical field: [0001] The invention belongs to the technical field of batteries and battery hydrogen storage materials, and in particular relates to a rare earth-magnesium-nickel hydrogen storage alloy for nickel-hydrogen batteries and a preparation method thereof. Background technique: [0002] With the continuous deterioration of the global environment, the demand for cost-effective secondary energy is becoming increasingly urgent. Ni-MH batteries have the advantages of environmental protection, high specific energy density, good safety, long cycle life, fast charging, no memory effect, and reasonable price. They have been widely used in military equipment, electric tools, household appliances and other fields. The automotive sector exhibits a huge market advantage. The anode materials of nickel metal hydride batteries used commercially are mainly rare earth series AB 5 type hydrogen storage alloy to LaNi 5 As a representative, the alloy is easy to pulverize, has low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C30/00C22C1/02C22F1/00C22F1/10H01M4/46
CPCY02E60/10
Inventor 闵德刘丽英陈彦伟
Owner SIHUI DABOWEN IND CO LTD
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