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AB5 hydrogen storage alloy with high hydrogen diffusion coefficient and preparation method thereof of AB5 hydrogen storage alloy

A technology of diffusion coefficient and hydrogen storage alloy, which is applied in the field of AB5 hydrogen storage alloy and its preparation, can solve the problems such as the reduction of alloy activation times, the deterioration of maximum discharge capacity and rate performance, and achieve the elimination of element segregation, improvement of diffusion speed, Effects of improving cycle performance and rate performance

Active Publication Date: 2014-05-21
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The literature (J.Alloys and compounds, 2003, Vol.354, pp310-314) discloses replacing AB with Cr and Si 5 Although Co in the alloy reduces the cost, and the replacement of Cr element can reduce the activation times of the alloy, the replacement of Si element can improve the cycle performance of the hydrogen storage alloy, but it makes the maximum discharge capacity and rate performance worse.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Press (La 56 RE 44 ) 32.95 Ni 49.43 co 9.09 mn 5.21 al 1.92 Cu 1.2 P 0.2 According to the mass percentage ratio shown, weigh the prepared raw materials, put REM, Ni, Co, Mn and Al into the melting crucible in the vacuum induction furnace, and put Cu and P into the secondary charging device in the form of phosphor copper alloy middle;

[0035] Vacuum the vacuum induction heating furnace to less than 10Pa, then fill it with argon, and repeat the process of vacuuming and argon filling once, then start the power supply under the condition of vacuum degree ≤ 35Pa, raise the temperature to 400°C and keep it warm for 30min;

[0036] When the argon gas is filled to a vacuum of 0.05MPa, the temperature is raised to 1500°C to fully melt the metal in the melting crucible;

[0037] Lower the temperature to 1250°C and add phosphor copper alloy at the same time;

[0038] The melt after adding the phosphor copper alloy is quickly poured on the cooling roll, and the melt is q...

Embodiment 2

[0041] Press (La 56 RE 44 ) 32.95 Ni 49.43 co 7.69 mn 5.21 al 1.92 Cu 2.4 P 0.4 According to the mass percentage ratio shown, weigh the prepared raw materials, put REM, Ni, Co, Mn and Al into the melting crucible in the vacuum induction furnace, and put Cu and P into the secondary charging device in the form of phosphor copper alloy middle;

[0042] Vacuum the vacuum induction heating furnace to less than 10Pa, then fill it with argon, and repeat the process of vacuuming and argon filling once, then start the power supply under the condition of vacuum degree ≤ 35Pa, raise the temperature to 500°C and keep it for 2 minutes;

[0043] When the argon gas is filled to a vacuum of 0.05MPa, the temperature is raised to 1500°C to fully melt the metal in the melting crucible;

[0044] Lower the temperature to 1450°C and add phosphor copper alloy at the same time;

[0045] The melt after adding the phosphor copper alloy is quickly poured on the cooling roll, and the melt is qu...

Embodiment 3

[0048] Press (La 56 RE 44 ) 32.95 Ni 49.43 co 4.89 mn 5.21 al 1.92 Cu 4.8 P 0.8 According to the mass percentage ratio shown, weigh the prepared raw materials, put REM, Ni, Co, Mn and Al into the melting crucible in the vacuum induction furnace, and put Cu and P into the secondary charging device in the form of phosphor copper alloy middle;

[0049] Vacuum the vacuum induction heating furnace to less than 10Pa, then fill it with argon, and repeat the process of vacuuming and argon filling once, then start the power supply under the condition of vacuum degree ≤ 35Pa, raise the temperature to 450°C and keep it warm for 25min;

[0050] When the argon gas is filled to a vacuum of 0.05MPa, the temperature is raised to 1500°C to fully melt the metal in the melting crucible;

[0051] Lower the temperature to 1300°C and add phosphor copper alloy at the same time;

[0052] The melt after adding the phosphor copper alloy is quickly poured on the cooling roll, and the melt is q...

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Abstract

The invention belongs to the field of hydrogen storage alloy electrode materials and particularly relates to an AB5 hydrogen storage alloy with a high hydrogen diffusion coefficient and a preparation method of the AB5 hydrogen storage alloy. According to the invention, the chemical general formula of the components of the hydrogen storage alloy represented in percentage by mass is as follows: (REM) aNib-xCoc-yMndAle (CufPg)x+y, wherein x is not less than 0 and not more than 7.2; y is not less than 1.2 and not more than 8.4; x+y is not less than 1.2 and not more than 8.4; and a, b, c, d, e, f and g are as follows: a is equal to 33 plus or minus 1, b is equal to 50 plus or minus -2, c is equal to 10 plus or minus -1, d is equal to 5 plus or minus -1, e is equal to 1.5 plus or minus -0.5, and g / (f+g) is equal to 0.13 plus or minus 0.02. According to the invention, the hydrogen storage alloy containing P and Cu is prepared by using a rapid solidification method; because part of Co and Ni metals with higher prices are replaced with a cheap phosphorus copper alloy, the diffusion speed of the hydrogen in the alloy is increased and the production cost of the AB5 alloy is reduced; the prepared AB5 alloy has the characteristics of fine crystal particles and uniform components; and element segregation is eliminated. Without reducing the discharge capacity of the alloy, the circulating performance and rate capability of the AB5 alloy are improved.

Description

technical field [0001] The invention belongs to the field of hydrogen storage alloy electrode materials, in particular to an AB with high hydrogen diffusion coefficient 5 Hydrogen storage alloy and its preparation method. Background technique [0002] In 1984, Willems of Philips Laboratory in the Netherlands adopted a method of multi-element alloying to partially replace LaNi with Co element 5 The Ni in the alloy makes a breakthrough in the charge-discharge cycle stability of the alloy, and the MH / Ni battery with the hydrogen storage alloy as the electrode material has finally entered the practical stage. In order to further improve the comprehensive electrochemical performance of hydrogen storage alloys, Japan and my country use cheap mixed rare earths Ml (lanthanum-rich) or Mm (cerium-rich) instead of LaNi. 5 Pure La with high cost in the alloy, and multi-element alloying on the B side of the alloy at the same time, have successively developed a variety of AB 5 Type mix...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03C22C1/03
Inventor 吴文远边雪涂赣峰张博
Owner NORTHEASTERN UNIV LIAONING