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Single-phase AB4 type superlattice hydrogen storage alloy electrode material and preparation method thereof

A hydrogen storage alloy and electrode material technology, applied in the field of materials, achieves the effects of low cost, convenient industrial production and application, and strong market competitiveness

Active Publication Date: 2017-10-20
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far no literature and patents have reported single-phase AB 4 Structural characteristics, electrochemical properties and related preparation methods of superlattice lanthanum-magnesium-nickel-aluminum hydrogen storage alloys

Method used

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  • Single-phase AB4 type superlattice hydrogen storage alloy electrode material and preparation method thereof
  • Single-phase AB4 type superlattice hydrogen storage alloy electrode material and preparation method thereof
  • Single-phase AB4 type superlattice hydrogen storage alloy electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The alloy composition is: La 0.80 Mg 0.20 Ni 3.62 Al 0.08 , select metal elements La, Ni, Al and Mg 2 Ni alloy compound is used as the raw material, and the as-cast alloy is prepared by the conventional intermediate frequency induction melting method, and then the obtained alloy ingot is put into a high-temperature resistant stainless steel annealing tank, so that the volume ratio of the alloy to the volume of the annealing tank is 2 / 3, and then graphite The sealing gasket seals the annealing tank and places it in a vacuum annealing furnace, and performs annealing treatment under the protection of an argon atmosphere with a pressure of –0.02MPa: first, the temperature is raised from room temperature to 500°C for 1h and kept for 1h; then the temperature is raised from 500°C to 600°C, 700°C, 800°C and 900°C, the heating time of each temperature range is 0.5h, and the holding time of each temperature point is 1h; then continue to heat up from 900°C to 950°C for 0.5h and...

Embodiment 2

[0023] The alloy composition is: La 0.79 Mg 0.21 Ni 3.60 Al 0.10 , select metal elements La, Ni, Al and Mg 2 Ni alloy compound is used as the raw material, and the as-cast alloy is prepared by the conventional intermediate frequency induction melting method, and then the obtained alloy ingot is put into a high-temperature resistant stainless steel annealing tank, so that the volume ratio of the alloy to the volume of the annealing tank is 2 / 3, and then graphite The sealing gasket seals the annealing tank and places it in a vacuum annealing furnace. The annealing treatment is carried out under the protection of an argon atmosphere with a pressure of 0.02MPa: first, the temperature is raised from room temperature to 500°C for 1h and kept for 1h; then the temperature is raised from 500°C to 600°C ℃, 700℃, 800℃ and 900℃, where the heating time for each temperature range is 0.5h, and the holding time for each temperature point is 1h; then continue to heat up from 900℃ to 950℃ fo...

Embodiment 3

[0025] The alloy composition is: La 0.79 Mg 0.21 Ni 3.80 Al 0.13 , select metal elements La, Ni, Al and Mg 2 Ni alloy compound is used as the raw material, and the as-cast alloy is prepared by the conventional intermediate frequency induction melting method, and then the obtained alloy ingot is put into a high-temperature resistant stainless steel annealing tank, so that the volume ratio of the alloy to the volume of the annealing tank is 2 / 3, and then graphite The sealing gasket seals the annealing tank and places it in a vacuum annealing furnace, and performs annealing treatment under the protection of an argon atmosphere with a pressure of –0.01MPa: first, the temperature is raised from room temperature to 500°C for 1h and kept for 1h; then the temperature is raised from 500°C to 600°C, 700°C, 800°C and 900°C, the heating time of each temperature range is 0.5h, and the holding time of each temperature point is 1h; then continue to heat up from 900°C to 950°C for 0.5h and...

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Abstract

The invention provides a single-phase AB4 type superlattice hydrogen storage alloy electrode material. The chemical composition of the single-phase AB4 type superlattice hydrogen storage alloy electrode material is La1-xMgx(NiAly)z, wherein x, y and z represent molar ratio; the numerical ranges of x, y and z are as follows: x is greater than or equal to 0.20 and is less than or equal to 0.24; y is greater than or equal to 0.021 and is less than or equal to 0.034; z is greater than or equal to 3.70 and is less than or equal to 3.93. The single-phase AB4 type superlattice hydrogen storage alloy electrode material is of a single-phase AB4 type superlattice structure; the space group is R-3m; the phase peakness is 100wt.%; a preparation method of the single-phase AB4 type superlattice lanthanum-magnesium-nickel-aluminum hydrogen storage alloy electrode material mainly comprises the following steps: putting alloy ingots into a stainless steel annealing pot with resistance to high temperature, controlling the ratio of the volume of the alloy to the volume of the annealing pot to be 2 to 3, then sealing the annealing pot by using a graphite sealing gasket, and putting the annealing pot in a vacuum annealing furnace for carrying out annealing treatment. The preparation method of the single-phase AB4 type superlattice hydrogen storage alloy electrode material is simple in operation and equipment; the process conditions are stable and easily controllable; the industrial production and application can be facilitated; the prepared single-phase AB4 type superlattice alloy can be directly used as nickel / metal hydride battery negative material; the alloy has the characteristics of high discharging capacity, long cycle life and low cost.

Description

Technical field: [0001] The invention belongs to the field of material technology, in particular to an electrode material and a preparation method thereof. Background technique: [0002] In recent years, with the acceleration of energy transformation, the development of low-carbon, green, renewable and environmentally friendly new energy materials has become one of the key technologies. As an important research field of new energy materials, hydrogen storage materials not only promote the development and utilization of hydrogen energy, but also promote the development of modern industries represented by new energy vehicles. Nickel-metal hydride (Ni / MH) secondary batteries, which use rare earth alloy hydride hydrogen storage materials as negative electrode materials and nickel hydroxide as positive electrode materials, are not only one of the important power batteries widely used in electric appliances and electric tools, but also And it also occupies an important share in t...

Claims

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Application Information

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IPC IPC(8): H01M4/38
CPCH01M4/383Y02E60/10
Inventor 韩树民张璐赵雨萌贾泽茹
Owner YANSHAN UNIV
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