doped a 5 b 19 Gadolinium-containing hydrogen storage alloy, electrode, battery and preparation method thereof

A technology of A5B19 and hydrogen storage alloy, which is applied in the direction of negative electrode, nickel battery, battery electrode, etc., can solve the problems of metal magnesium being volatile, dust explosion, safety hazards, etc., and achieves good rate discharge performance, high capacity retention rate, The effect of high discharge capacity

Active Publication Date: 2021-09-03
BAOTOU RES INST OF RARE EARTHS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal magnesium has the characteristics of low melting point and high saturated vapor pressure, which makes metal magnesium very volatile during metallurgical smelting, generating dust and explosion, which brings great safety hazards and increases the cost of hydrogen storage materials. The content and phase composition and the consistency of electrode and battery performance bring great difficulties

Method used

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  • doped a <sub>5</sub> b <sub>19</sub> Gadolinium-containing hydrogen storage alloy, electrode, battery and preparation method thereof

Examples

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preparation example Construction

[0078] According to one embodiment of the present invention, the doped A of the present invention 5 B 19 The preparation method of type gadolinium-containing hydrogen storage alloy comprises the steps:

[0079] (1) will be based on the doped A 5 B 19 The raw materials obtained from the composition of the gadolinium-containing hydrogen storage alloy are melted to a melt under the conditions of a pressure of -0.08 to -0.02 MPa and a temperature of 1000 to 2000 °C in an inert atmosphere;

[0080] (2) When the temperature of the melt reaches 1100-1600°C, it is made into a solid alloy;

[0081] (3) Heat-treating the solid alloy in an inert atmosphere for 10-70 hours under the conditions of a vacuum of 0.001-0.5 Pa and a temperature of 700-1500°C.

[0082] The doped A obtained by the present invention 5 B 19 type gadolinium-containing hydrogen storage alloys have the composition shown below: Re x Gd y Ni z mn a Al b m c Zr d Ti e , as described above.

[0083] In step...

Embodiment 1～14

[0099] Select and weigh raw materials according to the composition of the hydrogen storage alloy in Table 1. The raw materials are put into the vacuum induction melting furnace, and the furnace is washed with inert gas, which is repeated 4 times. Vacuumize the vacuum induction melting furnace to 3Pa, continue to fill inert gas into the vacuum induction melting furnace, so that the pressure in the vacuum induction melting furnace is -0.055MPa. The raw material was melted to a melt at 1500°C, and the heating was stopped. When the temperature of the melt reaches 1430° C., the melt is cast to a cooling copper roll, and the flakes are flung into alloy flakes with a thickness of 0.3 mm.

[0100] Put the alloy sheet in a vacuum treatment furnace, under the protection of inert gas, heat treatment at a vacuum degree of 0.01Pa and a temperature of 950°C for 25 hours to obtain doped A 5 B 19 type gadolinium-containing hydrogen storage alloy.

Embodiment 15～28

[0102] The hydrogen storage alloys of Examples 1 to 14 were mechanically crushed into hydrogen storage alloy powders of 200 to 300 meshes, and the hydrogen storage alloy powders with a mass ratio of 1:4 were mixed with carbonyl nickel powder, and the diameters of 15mm were made under a pressure of 11MPa. The MH electrode sheet (negative electrode material). The MH electrode sheet (negative electrode material) was placed between two sheets of nickel foam, and a nickel strip as a tab was sandwiched at the same time, and then pressed under a pressure of 11 MPa to obtain a hydrogen storage alloy electrode. Spot welding around the electrode sheet ensures close contact between the electrode sheet and the nickel foam.

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Abstract

The invention discloses a doped A 5 B 19 Type gadolinium-containing hydrogen storage alloy, electrode, battery and preparation method thereof. This hydrogen storage alloy has the composition Re shown below x Gd y Ni z mn a al b m c Zr d Ti e ; Wherein, Re is selected from one or more rare earth elements, M is selected from one or more of Cu, Fe, Co, Sn, V, W, Cr, Zn, Mo, Si; x, y, z, a, b, c, d and e respectively represent the atomic ratio of each element; x>0, y>0.1, x+y=3, 4≥a+b>0, 4≥c≥0, 3≥d+e >0, 13>z+a+b+c≥11. The hydrogen storage alloy of the present invention does not contain magnesium element and has high maximum discharge capacity.

Description

technical field [0001] The present invention relates to a doped A 5 B 19 Type gadolinium-containing hydrogen storage alloy, electrode, battery and preparation method thereof. In particular to a zirconium and / or titanium doped A 5 B 19 Type gadolinium-containing hydrogen storage alloy, electrode, battery and preparation method thereof. Background technique [0002] 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, enabling large-scale development and utilization of hydrogen energy. Nickel-metal hydride (MH / Ni) batteries, heat engines / compressors, solid / H 2 Energy storage systems have shown obvious technical advantages in new energy vehicles, smart grid energy storage peak shaving, communication base station reserve power, portable electric tools, and mode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03C22C1/02C22F1/10C22F1/02H01M4/38H01M10/30
CPCC22C1/023C22C19/007C22C19/03C22C2202/04C22F1/02C22F1/10H01M4/383H01M10/30H01M2004/027Y02E60/10
Inventor 周淑娟王利闫慧忠张旭熊玮李金李宝犬徐津赵玉园郑天仓
Owner BAOTOU RES INST OF RARE EARTHS
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