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La-Mg-Ni series hydrogen storage alloy for low-temperature nickel-hydrogen battery and preparation method of La-Mg-Ni series hydrogen storage alloy

A technology for nickel-hydrogen batteries and hydrogen storage alloys, applied in the negative electrode materials of nickel-hydrogen batteries, La-Mg-Ni hydrogen storage alloys for low-temperature nickel-hydrogen batteries and their preparation fields, can solve problems such as unsatisfactory cycle life, and achieve Convenient operation, simple process, high and low temperature electrochemical performance effect

Inactive Publication Date: 2018-06-12
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently commercialized hydrogen storage alloys used in Ni / MH battery anode materials are AB 5 type alloy, but the maximum capacity of the alloy has reached the limit value of 330mAh / g, gradually unable to meet the increasing market performance level and requirements, and the La-Mg-Ni series A 2 B 7 The theoretical capacity of the alloy is up to 380-410mAh / g, and it has become a strong competitor for Ni / MH battery anode materials, but the biggest problem restricting the industrialization of this alloy is that its cycle life is not ideal

Method used

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  • La-Mg-Ni series hydrogen storage alloy for low-temperature nickel-hydrogen battery and preparation method of La-Mg-Ni series hydrogen storage alloy
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  • La-Mg-Ni series hydrogen storage alloy for low-temperature nickel-hydrogen battery and preparation method of La-Mg-Ni series hydrogen storage alloy

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Embodiment 1

[0036] La 0.65 Ce 0.1 Mg 0.25 Ni 3 co 0.5 Preparation of alloy powders, including:

[0037] (1) According to La 0.65 Ce 0.1 Mg 0.25 Ni 3 co 0.5 Composition atomic ratio (that is: in the alloy, the atomic percentage of La is 14.44%, the atomic percentage of Ce is 2.22%, the atomic percentage of Mg is 5.56%, and the atomic percentage of Ni is 66.67%, The atomic percentage of Co is 11.11%) and put into an alumina crucible after weighing.

[0038] (2) The alloy is smelted by the high-frequency induction melting method protected by helium, and the metal liquid is fully stirred during the smelting process. After completion, the alloy is cast into a water-cooled copper mold for rapid cooling to obtain a cast alloy ingot.

[0039] (3) The as-cast alloy ingot is placed in a single-roller quick quenching furnace, and vacuumized to 10 -2 -10 -3 Mpa is filled with 0.3MPa high-purity argon gas, and the ingot is melted by induction heating with a high-frequency power supply, and...

Embodiment 2

[0074] La 0.65 Ce 0.1 Mg 0.25 Ni 3 co 0.5 Preparation of alloy powders, including:

[0075] (1) According to La 0.65 Ce 0.1 Mg 0.25 Ni 3 co 0.5 The atomic ratio of the components is weighed and put into the alumina crucible;

[0076] (2) The alloy is smelted by the high-frequency induction melting method protected by helium, and the metal liquid is fully stirred during the smelting process. After completion, the alloy is cast into a water-cooled copper mold for rapid cooling to obtain a cast alloy ingot.

[0077] (3) The as-cast alloy ingot is placed in a single-roller quick quenching furnace, and vacuumized to 10 -2 -10 -3 Mpa is filled with 0.3MPa high-purity argon gas, and the ingot is melted by induction heating with a high-frequency power supply, and then sprayed on the high-speed rotating water-cooled copper roller with the surface speed of 20m / s and 30m / s at 1500°C respectively. , to obtain thin alloy strips after rapid solidification;

[0078] (4) After th...

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Abstract

The invention discloses a La-Mg-Ni series hydrogen storage alloy for a low-temperature nickel-hydrogen battery and a preparation method of the La-Mg-Ni series hydrogen storage alloy. The chemical component of the alloy is La<0.75-x>CexMg0.25Ni3Co0.5, wherein the subscripts in the chemical component are atomic ratios of corresponding constituents, and the value range of x is 0.09-0.11. The preparation method of the alloy comprises the following steps of raw material preparation; smelting and casting; alloy thin strip preparation; and grinding and screening. The alloy prepared by the method hashigh low-temperature electrochemical performance, and under the condition of 248K, at the quenching rate of 10 m.s<-1>, when charging and discharging are circulated 100 times, the discharge capacity of the alloy reaches the maximum value of 245.9 mAh.g<-1>. An alloy material prepared by the preparation method is particularly suitable for being used under the condition of zero DEG C or below, particularly under the condition of minus 25 DEG C and even under the condition of minus 30 DEG C.

Description

technical field [0001] The invention belongs to the field of preparation of hydrogen storage materials, and in particular relates to a La-Mg-Ni hydrogen storage alloy for low-temperature nickel-hydrogen batteries and a preparation method thereof. The hydrogen storage alloy is particularly suitable as a negative electrode material for nickel-hydrogen batteries used under low temperature conditions . Background technique [0002] In recent years, the popularity and development of fuel vehicles have made environmental problems such as air pollution more and more serious. Therefore, the development of new energy vehicles is imminent. Among them, hybrid electric vehicles (HEV) and pure electric vehicles ( EV) has attracted widespread attention from all over the world due to its excellent performance, high safety, stable structure, and environmental friendliness. Therefore, with the vigorous development of the Ni / MH battery industry, hydrogen storage alloys as battery anode mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C1/02B22F1/00B22F9/04
CPCB22F1/0003B22F9/04C22C1/023C22C19/03C22C2202/04
Inventor 武英吕玮原建光张宝况春江周少雄
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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