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Doped ab3 type rare earth-samarium-nickel hydrogen storage alloy, battery and preparation method

A technology of hydrogen storage alloys and rare earths, which is applied in the direction of nickel storage batteries, battery electrodes, alkaline storage batteries, etc., can solve the problems of low capacity retention and achieve high capacity retention, high discharge capacity, and fewer activation cycles

Active Publication Date: 2021-07-16
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hydrogen storage alloy has a low capacity retention rate at the 100th cycle

Method used

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  • Doped ab3 type rare earth-samarium-nickel hydrogen storage alloy, battery and preparation method

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preparation example Construction

[0060] The preparation process of the solid alloy can be a flake process or a casting process. Alloy flakes were prepared by flake flakes. The thickness of the alloy sheet may be 0.01-1.5 mm, preferably 0.1-0.8 mm, more preferably 0.1-0.5 mm. Alloy ingots were prepared by casting. The thickness of the alloy ingot may be 2-50 mm, preferably 6-30 mm, more preferably 10-25 mm.

[0061] The hydrogen storage alloy is obtained by heat-treating the solid alloy at a temperature of 850-1050° C. for 10-50 h under a vacuum degree below -0.1 Pa. Heat treatment can be performed in an inert atmosphere. The inert atmosphere can be argon or nitrogen, etc. The vacuum degree is a relative vacuum degree, and its value is below -0.1Pa, preferably -0.1~-0.001Pa, more preferably -0.09~-0.01Pa, most preferably -0.03~-0.01Pa. The heat treatment temperature may be 850-1050°C, preferably 800-1000°C, more preferably 900-1000°C. The heat treatment time is 10-50 h, preferably 15-30 h, more preferabl...

Embodiment 1～6

[0071] Prepare metal raw materials according to the hydrogen storage alloy formula in Table 1, and put the metal raw materials into a vacuum induction melting furnace. Wash the furnace with argon gas 5 times, evacuate the vacuum induction melting furnace to 2Pa, and fill it with argon until the pressure in the vacuum induction melting furnace is -0.055MPa.

[0072] Heat and melt the metal raw material at 1500°C. When the temperature of the melt reaches 1430° C., the melt is cast to a cooling copper roll, and flakes are flaked into alloy flakes (thickness is 0.2 mm).

[0073] The alloy sheet was placed in a vacuum treatment furnace and heat-treated at -0.01Pa and 950°C for 16h under the protection of argon.

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Abstract

The invention discloses a doped AB 3 Type rare earth-samarium-nickel hydrogen storage alloy, battery and preparation method. The chemical composition of the hydrogen storage alloy is RE x SM y Ni z mn a Al b m c Zr d Ti e ; RE is selected from rare earth elements other than Sm, and M is selected from one or more of Cu, Fe, Co, Sn, V, W, Cr, Zn, Mo, Si; a, b, c, d, e, x, y and z respectively represent the mole fraction of each element; 9.5>a+b+c+z≥7.8, 3≥a+b>0, 2≥c≥0, 3≥d+e>0, x >0, y>0.1, x+y=3. Various electrochemical properties of the hydrogen storage alloy of the present invention are good.

Description

technical field [0001] The present invention relates to a doped AB 3 Type rare earth-samarium-nickel hydrogen storage alloy, battery and preparation method. Background technique [0002] As a green energy system for global energy transformation and upgrading, hydrogen energy is gradually becoming the protagonist of the energy market. Rare earth hydrogen storage alloys are important energy storage and conversion materials. Nickel metal hydride (MH / Ni) batteries made of rare earth hydrogen storage materials have shown obvious technical advantages in the field of new energy vehicles. [0003] Commercial Rare Earth Hydrogen Storage Alloy LaNi 5 (AB 5 ) The energy density is about 330mAh / g, which is difficult to meet the needs of the development of Ni-MH batteries to higher energy density. Superlattice AB 3-3.8 Type La-Mg-Ni series rare earth hydrogen storage alloys have high electrochemical capacity. CN105274395A discloses that chemical formula is La 1-a-b-c-d SM a Y b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/10C22F1/02H01M4/38H01M10/30
CPCC22C1/023C22C19/007C22C19/03C22C30/00C22C2202/04C22F1/02C22F1/10H01M4/383H01M10/30H01M2004/027Y02E60/10
Inventor 熊玮闫慧忠李宝犬王利李金张旭周淑娟赵玉园徐津郑天仓
Owner BAOTOU RES INST OF RARE EARTHS
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