A5B19 type gadolinium-containing hydrogen storage alloy, negative electrode and preparation method

An A5B19, hydrogen storage alloy technology, applied in negative electrodes, chemical instruments and methods, hydrogen and other directions, can solve problems such as high production costs and potential safety hazards, and achieve the effect of improving discharge performance and improving electroactivation performance.

Active Publication Date: 2020-07-14
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrogen storage alloy electrode material contains the metal element Mg, the production cost is high, and there is a great potential safety hazard

Method used

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  • A5B19 type gadolinium-containing hydrogen storage alloy, negative electrode and preparation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0070] Specifically, the preparation method of the hydrogen storage alloy of the present invention includes the following steps: heating and melting the raw materials in a vacuum melting furnace to obtain a smelted product; forming the smelted product into alloy flakes or alloy ingots; placing the alloy flakes or alloy ingots under heat treatment Heat treatment in a furnace to obtain a hydrogen storage alloy containing gadolinium. In the present invention, the composition of the raw material is RE u Gd v Ni w-a-b-c mn a al b m c , the specific components and proportions are as described above, and will not be repeated here. When placing the raw materials in the vacuum melting furnace, the rare earth metal elements Gd and RE can be placed on the upper part of the vacuum melting furnace, and other elements can be placed on the bottom of the vacuum melting furnace.

[0071] In the present invention, after the raw materials are placed in the vacuum smelting furnace, a vacuum...

Embodiment 1～16

[0083] According to the formula in Table 1, each raw material is placed in the vacuum melting furnace sequentially from the bottom to the upper part of the vacuum melting furnace. Rare earth metal raw materials are placed on the upper part, and other metal raw materials are placed on the bottom. Vacuumize the vacuum melting furnace until its absolute vacuum degree is ≤5Pa, and then fill it with argon until the relative vacuum degree is -0.055MPa; heat the vacuum melting furnace to 1400°C, and keep it warm for 3 minutes after the raw materials in the vacuum melting furnace are completely melted. Heating was stopped to obtain a smelted product. Cast the smelted product to a cooling copper roll, and quickly quench and spin it into an alloy sheet with a thickness of 0.3mm; place the alloy sheet in a heat treatment furnace with a relative vacuum of -0.025MPa filled with argon, and heat treat it at 850°C for 16h. A hydrogen storage alloy containing gadolinium is obtained.

experiment example

[0085] The hydrogen storage alloys of Examples 1-16 were mechanically broken into 200-mesh alloy powders respectively. The alloy powder and the conductive agent carbonyl nickel powder were mixed at a mass ratio of 1:4, and an electrode sheet with a diameter of 15 mm was made under 11 MPa. The electrode sheet was placed between two sheets of nickel foam as the negative electrode collector, and the nickel strip as the tab was sandwiched at the same time, and the hydrogen storage alloy negative electrode was made under 11 MPa. Spot welding around the electrode sheet ensures close contact between the electrode sheet and the nickel mesh.

[0086] The negative electrode in the open-type three-electrode system for testing electrochemical performance is a hydrogen storage alloy negative electrode, and the positive electrode is sintered Ni(OH) with excess capacity. 2 / NiOOH electrode, the reference electrode is Hg / HgO, the electrolyte is 6mol L -1 potassium hydroxide solution. The a...

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Abstract

The invention discloses an A<5>B<19> type hydrogen storage alloy, a negative electrode and a preparation method. The composition formula of the hydrogen storage alloy is REGd<v>Ni<w-a-b-c>MnAlM<c>, RE is selected from one or more of rare earth metal elements except Gd, M is selected from one or more of Zn, V, W, Cu, Fe, Sn, Cr, Mo and Si elements, u, v, w, a, b and c represent mole fractions of all the elements correspondingly, u is larger than 0, v is larger than 0.1, u plus v is 3, w is less than 13 and larger than or equal to 11, a plus b is less than or equal to 4 and larger than0, c is less than or equal to 2 and larger than or equal to 0. According to the alloy and the method, the maximum discharge capacity of the hydrogen storage alloy is improved, and the service life ofthe hydrogen storage alloy is prolonged.

Description

technical field [0001] The present invention relates to a 5 B 19 Type hydrogen storage alloy, negative electrode and preparation method. Background technique [0002] As a green energy for global energy transformation and upgrading, hydrogen energy is gradually becoming the protagonist of the energy market. Hydrogen storage alloys are a class of functional materials with high hydrogen storage density discovered in the late 1960s. As an important energy storage and conversion material, rare earth hydrogen storage alloys react with hydrogen to form metal hydrides, which can absorb and desorb a large amount of hydrogen under specific temperature and pressure conditions, and have fast hydrogen absorption / desorption reactions and excellent reversibility. Large-scale development and utilization of hydrogen energy. Rare earth hydrogen storage alloys have excellent kinetic and electrochemical properties, and are usually used as anode materials for nickel-metal hydride (MH-Ni) se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C1/02C22F1/10C22F1/02C21D9/46C21D9/70B22D11/06C01B3/00H01M4/24H01M4/38H01M10/30
CPCB22D11/0611C01B3/0031C21D9/46C21D9/70C22C1/023C22C19/03C22F1/02C22F1/10H01M4/242H01M4/383H01M10/30H01M2004/027Y02E60/10Y02E60/32
Inventor 闫慧忠周淑娟张旭赵玉园徐津李金王利李宝犬郑天仓熊玮
Owner BAOTOU RES INST OF RARE EARTHS
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