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Rare earth-samarium-nickel type hydrogen storage alloy, negative electrode, battery and preparation method

A hydrogen storage alloy and rare earth technology, applied in nickel batteries, battery electrodes, alkaline batteries, etc., can solve the problems of many electrode cycles, poor self-discharge performance, and low ratio, and achieve high-rate discharge performance improvement. Self-discharge performance, the effect of reducing the number of cycles

Active Publication Date: 2020-05-08
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A hydrogen storage alloy is La 0.6 Ce 0.2 SM 0.1 Ni 3.3 Cu 0.7 Fe 0.1 co 0.1 mn 0.6 Al 0.3 , the ratio of Sm to rare earth elements such as La and Ce is still low, resulting in more cycles required for full electrode activation
Another hydrogen storage alloy is La 0.6 Ce 0.2 Y 0.1 Ni 3.3 Cu 0.7 Fe 0.15 co 0.1 mn 0.6 Al 0.35 , the ratio of Y to rare earth elements such as La and Ce is still low, resulting in poor self-discharge performance

Method used

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  • Rare earth-samarium-nickel type hydrogen storage alloy, negative electrode, battery and preparation method
  • Rare earth-samarium-nickel type hydrogen storage alloy, negative electrode, battery and preparation method
  • Rare earth-samarium-nickel type hydrogen storage alloy, negative electrode, battery and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative example 1

[0072] The metal raw materials (refer to Table 1 for the formula) are placed in the vacuum melting furnace in the order of melting point from large to small, from bottom to top, but the rare earth metal is placed on the uppermost part of the crucible of the vacuum melting furnace, and argon gas is used for gas washing operation 5 times. Vacuumize the vacuum melting furnace to its absolute vacuum degree ≤ 5Pa, and fill it with argon to a relative vacuum degree of -0.05MPa. The vacuum melting furnace is heated to 1300°C, and the heating is stopped after the metal raw materials in the furnace are completely melted into molten metal. Cast the molten metal to a cooling copper roll, and flake it into an alloy sheet with a thickness of 0.2mm. The alloy sheet was placed in an environment with an absolute vacuum of 0.01 Pa and protected by argon, and heat-treated at 850° C. for 20 hours to obtain a hydrogen storage alloy.

[0073] Table 1

[0074]

[0075] Remarks: N is the numbe...

Embodiment 2 and comparative example 2

[0078] The metal raw materials (refer to Table 2 for the formula) are placed in the vacuum melting furnace in the order of melting point from large to small, and from bottom to top, but the rare earth metal is placed on the uppermost part of the crucible of the vacuum melting furnace, and argon gas is used for gas washing operation 5 times. Vacuumize the vacuum melting furnace to its absolute vacuum degree ≤ 5Pa, and fill it with argon to a relative vacuum degree of -0.05MPa. The vacuum melting furnace is heated to 1300°C, and the heating is stopped after the metal raw materials in the furnace are completely melted into molten metal. Cast the molten metal to a cooling copper roll, and flake it into an alloy sheet with a thickness of 0.2 mm. The alloy sheet was placed in an environment with an absolute vacuum of 0.01 Pa and protected by argon, and heat-treated at 850° C. for 20 hours to obtain a hydrogen storage alloy.

[0079] Table 2

[0080]

[0081] It can be seen fro...

Embodiment 3 and comparative example 3

[0083] The metal raw materials (refer to Table 3 for the formula) are placed in the vacuum melting furnace in the order of melting point from large to small, and from bottom to top, but the rare earth metal is placed on the uppermost part of the crucible of the vacuum melting furnace, and argon gas is used for gas washing operation 5 times. Vacuumize the vacuum melting furnace to its absolute vacuum degree ≤ 5Pa, and fill it with argon to a relative vacuum degree of -0.05MPa. The vacuum melting furnace is heated to 1300°C, and the heating is stopped after the metal raw materials in the furnace are completely melted into molten metal. Cast the molten metal to a cooling copper roll, and flake it into an alloy sheet with a thickness of 0.2 mm. The alloy sheet was placed in an environment with an absolute vacuum of 0.01 Pa and protected by argon, and heat-treated at 850° C. for 20 hours to obtain a hydrogen storage alloy.

[0084] table 3

[0085]

[0086] It can be seen fro...

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Abstract

The invention discloses a rare earth-samarium-nickel type hydrogen storage alloy, a negative electrode, a battery and a preparation method. The hydrogen storage alloy is prepared from the following component of RExSmyLzNid-a-b-cMnaAlbMc, wherein RE is selected from one or more elements of La, Ce, Pr, Nd and Sc, L is selected from one or two of Y and Gd, and M is selected from one or more elementsof Cu, Fe, Co, Sn, V, W, Cr, Zn, Mo and Si; x, y, z, d, a, b and c represent the mole fraction of each element, the x is greater than 0, the y is greater than or equal to 0.5, the z is less than the y, and the x plus the y plus the z equals 6; the d is greater than or equal to 17 and less than or equal to 25, the a plus the b is greater than 0 and less than or equal to 7, and the c is greater thanor equal to 0 and less then or equal to 5; and the hydrogen storage alloy does not contain Mg. The hydrogen storage alloy id less in self-discharge and few in cycle number required by the complete activation of an electrode.

Description

technical field [0001] The invention relates to a rare earth-samarium-nickel type hydrogen storage alloy, a negative electrode, a battery and a preparation method. Background technique [0002] Rare earth hydrogen storage materials are an important energy conversion material. With the rapid growth of demand for nickel-metal hydride batteries for new energy vehicles, smart grid energy storage, and communication base station reserve power, the global market demand for rare earth hydrogen storage materials will also increase rapidly, and more comprehensive performance of rare earth hydrogen storage materials has also been put forward. high demands. Compared with the traditional AB5 type hydrogen storage alloy, the new generation of superlattice structure AB 3 、A 2 B 7 and A 5 B 19 Type hydrogen storage alloys have better electrochemical performance and larger hydrogen storage capacity. The currently commercialized superlattice RE-Mg-Ni is difficult to control, and the vo...

Claims

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Application Information

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IPC IPC(8): C22C19/03C22C1/02C22F1/02C22F1/10B22D11/06C21D9/46H01M4/24H01M4/38H01M10/30
CPCB22D11/0611C21D9/46C22C1/023C22C19/03C22F1/02C22F1/10H01M4/242H01M4/383H01M10/30Y02E60/10
Inventor 周淑娟闫慧忠王利熊玮徐津李宝犬赵玉园李金张旭郑天仓
Owner BAOTOU RES INST OF RARE EARTHS