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A2B7 hydrogen storage alloy for nickel-hydride battery and preparation method thereof

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

Active Publication Date: 2013-09-25
SIHUI DABOWEN IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The side A mostly uses rare earth elements such as Ce, Pr, and Nd to replace, but the price of Pr and Nd is high, which affects the price of the final product
Elements such as Co, Mn, and Al are mostly used for substitution on the B side, and Co is also an expensive and scarce resource. So far, no report has been seen on the substitution of elements on the B side by Ag, Sr, and Ge.

Method used

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  • A2B7 hydrogen storage alloy for nickel-hydride battery and preparation method thereof
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  • A2B7 hydrogen storage alloy for nickel-hydride battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 2

[0020] According to the structural formula La 0.90 Nd 0.90 Mg 0.4 Ni 6.60 al 0.4 co 0.20 Ag 0.01 Weigh the metal raw materials La, Nd, Mg, Ni, Al, Co, Ag, put them in the crucible of the induction melting furnace, vacuumize (0.04Pa) and fill it with argon gas, and the pressure in the furnace is 0.09MPa. Smelt at 1250°C for 2.5 hours to obtain a molten metal; pour the molten metal into a water-cooled ingot mold and cool to obtain an alloy ingot. Place the alloy ingot in a horizontal heat treatment furnace, vacuumize (0.01Pa) and fill it with protective gas argon, the pressure in the furnace is 0.01MPa, anneal at 1000°C for 20h, and get A 2 B 7 Hydrogen storage alloys for superlattice nickel metal hydride batteries.

Embodiment 3

[0022] According to the structural formula La 0.90 Nd 0.90 Mg 0.4 Ni 6.60 al 0.4 co 0.50 Ag 0.02 Weigh the metal raw materials La, Nd, Mg, Ni, Al, Co, Ag, put them in the crucible of the induction melting furnace, vacuumize (0.04Pa) and fill with argon gas, the pressure in the furnace is 0.5MPa, Smelt at 1350°C for 3 hours to obtain 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 0.5MPa, anneal at 1100°C for 2h, and get A 2 B 7 Hydrogen storage alloys for superlattice nickel metal hydride batteries.

Embodiment 4

[0024] According to the structural formula La 0.75 Nd 0.75 Mg 0.4 Ni 6.10 al 0.4 co 0.80 Ag 0.03Weigh the metal raw materials La, Nd, Mg, Ni, Al, Co, Ag, put them in the crucible of the induction melting furnace, vacuumize (0.009Pa) and fill with argon gas, the pressure in the furnace is 0.005MPa, Smelt at 1050°C for 5 hours to obtain a molten metal; pour the molten metal into a water-cooled ingot mold and cool to obtain an alloy ingot. Place the alloy ingot in a horizontal heat treatment furnace, vacuumize (0.04Pa) and fill it with protective gas argon, the pressure in the furnace is 1.0MPa, anneal at 800°C for 20h, and obtain A2B7 superlattice nickel hydrogen after crushing Hydrogen storage alloys for batteries.

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Abstract

The invention discloses an A2B7 hydrogen storage alloy for nickel-hydride battery and a preparation method thereof. The A2B7 hydrogen storage alloy has a structure formula of LnaMgbNixYyZz in which Ln is at least one element selected from rare earth elements; Y is at least one element selected from Al, Co, Nb, V, Fe, Cu, Zn, As, Ga, Mo, Sn, In, W, Si and P; and Z is at least one element selected from Ag, Sr and Ge at least. X, Y and Z shall satisfy 0.5 <=a (2, 0 (b (1, 5 (x+y+z (9, 0 (y (3, 0 (z (1. In the invention, the A2B7 hydrogen storage alloy for superlattice nickel-hydrogen battery is prepared by weighing raw materials such as metal lanthanum, neodymium, nickel, magnesium, aluminum and silver according to the structure formula (LnaMgbNixYyZz) and performing induction smelting. The phase content of A2B7 in the hydrogen storage alloy shall be over 90% through strict control of the alloy composition and the proper annealing treatment. In the invention, B side elements are replaced by Ag, Sr and Ge etc., the cycle life of hydrogen storage alloy is prolonged without effecting discharge capacity, and the low-temperature performance thereof is improved.

Description

Technical field: [0001] The invention belongs to the technical field of batteries and battery hydrogen storage materials, and in particular relates to an A 2 B 7 Type hydrogen storage alloy and its preparation method. Background technique: [0002] Energy is the most important material basis for supporting today's human civilization and ensuring social development. Entering the 21st century, while enjoying the achievements of human civilization, people have to face the two major problems of energy crisis and environmental pollution. Ni-MH batteries can meet the growing demand for mobile energy such as electronic products and electric vehicles due to their advantages such as environmental protection, high specific energy density, good safety, long cycle life, fast charging, no memory effect, and affordable price. , Has been widely used in military equipment and weapons, electric tools, household appliances and hybrid electric vehicles (HEV) and other fields. [0003] In a...

Claims

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Application Information

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IPC IPC(8): H01M4/38
CPCY02E60/10
Inventor 陈彦伟刘丽英闵德
Owner SIHUI DABOWEN IND CO LTD
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