Hydrogen storage alloy and preparation method thereof as well as cathode and battery using the alloy

A hydrogen storage alloy and alloy technology are applied in the fields of hydrogen storage alloys and their preparation, as well as negative electrodes and batteries using the alloys, which can solve the problems of low capacity and poor cycle performance of nickel-hydrogen batteries, and achieve improved cycle performance and initial capacity. Effect

Inactive Publication Date: 2009-01-28
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of low capacity and poor cycle performance of nickel-hydrogen batteries using hydrogen storage alloys in the prior art, and provide a hy...

Method used

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Examples

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preparation example Construction

[0015] The preparation method of the hydrogen storage alloy described in the present invention includes melting the alloy raw material and cooling and solidifying it into an ingot under a protective gas, wherein the ratio of the alloy raw material conforms to the alloy composition formula La (1- x) Y x Ni a co b mn c B d , where, B is one or more of aluminum, iron, copper, tin, titanium, chromium and vanadium, x, a, b, c, d are the mole fractions of Y, Ni, Co, Mn and B respectively , 0.05≤x≤0.5, 2.5≤a≤3.5, 0≤b≤0.5, 0.05≤c≤1.0, 0≤d≤1.0, 3.0≤a+b+c+d≤4.0.

[0016] Preferably, the range of b is 0.1≤b≤0.5, and the range of d is 0.1≤d≤1.0.

[0017] The B is one or more of aluminum, iron, copper, tin, titanium, chromium and vanadium, preferably two or more of aluminum, iron, copper, tin, titanium, chromium and vanadium.

[0018] The hydrogen storage alloy obtained after being cooled and solidified into an ingot in the present invention is in block shape, and the hydrogen stora...

Embodiment 1

[0035] This example is used to illustrate the hydrogen storage alloy provided by the present invention and the hydrogen storage alloy negative electrode and nickel-metal hydride secondary battery using the hydrogen storage alloy.

[0036] Weigh metal lanthanum, yttrium, nickel, cobalt, manganese, aluminum with a molar ratio of 0.5: 0.5: 3.0: 0.2: 0.5: 0.3, and place in an intermediate frequency induction melting furnace (produced by Jinzhou Electric Furnace Co., Ltd., with a capacity of 500kg), Melting at 1450°C for 3 hours and casting to obtain an alloy ingot. Elemental analysis showed that the composition of the obtained hydrogen storage alloy block was La 0.5 Y 0.5 Ni 3.0 co 0.2 mn 0.5 al 0.3 . The hydrogen storage alloy block was mechanically crushed and sieved under the protection of an argon atmosphere to obtain hydrogen storage alloy powder, and the particle size distribution of the hydrogen storage alloy powder was measured using a BT-9300S laser particle size di...

Embodiment 2

[0041] This example is used to illustrate the hydrogen storage alloy provided by the present invention and the hydrogen storage alloy negative electrode and nickel-metal hydride secondary battery using the hydrogen storage alloy.

[0042] Weigh the metal lanthanum, yttrium, nickel, cobalt, manganese, aluminum, titanium at a molar ratio of 0.6:0.4:2.8:0.3:0.4:0.25:0.1, and place them in a medium frequency induction melting furnace for smelting at 1450°C for 3 hours , cast alloy ingots. Elemental analysis showed that the composition of the obtained hydrogen storage alloy block was La 0.6 Y 0.4 Ni 2.8 co 0.3 mn 0.4 al 0.25 Ti 0.1 . The hydrogen storage alloy block is mechanically crushed and sieved under the protection of an argon atmosphere to obtain hydrogen storage alloy powder, and the particle size distribution of the hydrogen storage alloy powder is measured using a BT-9300S laser particle size distribution meter. The average particle diameter of the hydrogen storage...

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Abstract

The invention provides a hydrogen storage alloy. The alloy has the compositions shown in formula La(1-x)YxNiaCobMncBd, wherein B is one or a plurality of aluminum, iron, copper, tin, titanium, chromium and vanadium; x, a, b, c and d respectively represents the mole fractions of Y, Ni, Co, Mn and B; moreover, x is more than or equal to 0.05 and less than or equal to 0.5, a is more than or equal to 2.5 and less than or equal to 3.5, b is more than or equal to 0 and less than or equal to 0.5, c is more than or equal to 0.05 and less than or equal to 1.0, d is more than or equal to 0 and less than or equal to 1.0 and the sum of a, b, c and d is more than or equal to 3.0 and less than or equal to 4.0. In the invention, the specific capacity of the hydrogen storage alloy is much higher than that of the hydrogen storage alloy in the prior art. In addition, the initial capacity of a nickel-hydrogen battery made by the hydrogen storage alloy is also increased, and the cycle performance of the nickel-hydrogen battery is substantially improved.

Description

technical field [0001] The invention relates to a hydrogen storage alloy, a preparation method thereof, a negative electrode and a nickel-hydrogen battery using the alloy. Background technique [0002] With the issuance of the European Union Directive on the Restriction of the Use of Specific Hazardous Substances in Electrical and Electronic Products (RoHs Directive), higher requirements have been placed on various power sources. Lead-acid batteries containing lead and cadmium and nickel-cadmium secondary batteries will The use is prohibited or restricted, and Ni-MH batteries are more and more popular because they do not contain toxic elements and are an ideal green battery. [0003] In nickel-metal hydride batteries, the negative electrode active material is generally a hydrogen storage alloy, and the performance of the hydrogen storage alloy directly affects the capacity and cycle performance of the battery using the hydrogen storage alloy. Since the electrolyte of nickel...

Claims

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Application Information

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IPC IPC(8): H01M4/38C22C19/03C22C1/02H01M4/32H01M10/30
CPCY02E60/124Y02E60/10
Inventor 杨昊耿伟贤
Owner BYD CO LTD
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