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AB3 type gadolinium-containing hydrogen storage alloy, electrode, battery and preparation method of AB3 type gadolinium-containing hydrogen storage alloy

A hydrogen storage alloy and battery technology, which is applied in the direction of negative electrodes, battery electrodes, nickel storage batteries, etc., can solve the problems of low Mg melting point, low capacity retention rate, and low energy density, and achieve high maximum discharge capacity and fewer activation cycles , The effect of high capacity retention

Active Publication Date: 2020-07-31
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the first-generation rare earth hydrogen storage alloy that has been commercialized is LaNi 5 (AB 5 ), its low energy density (about 330mAh / g) is difficult to meet the needs of Ni-MH batteries to develop higher energy density
The second generation superlattice AB 3-3.8 Type La-Mg-Ni series rare earth hydrogen storage alloys have high electrochemical capacity, but the melting point of Mg is low (about 648.8°C), and the saturated vapor pressure is high, which makes it extremely volatile and produces dust and explosion during metallurgical smelting , which not only brings great safety hazards to the preparation of alloys but also increases the preparation cost, and at the same time brings great difficulties in controlling the Mg content and phase composition and the consistency of electrode and battery performance.
The hydrogen storage alloy has a low capacity retention rate at the 100th cycle

Method used

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  • AB3 type gadolinium-containing hydrogen storage alloy, electrode, battery and preparation method of AB3 type gadolinium-containing hydrogen storage alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～13

[0080] The raw materials of the hydrogen storage alloy composition shown in Table 1 were put into a vacuum induction melting furnace, and the furnace was washed 5 times with high-purity inert gas. The vacuum induction melting furnace is evacuated to 2Pa and then filled with inert gas until the pressure in the vacuum induction melting furnace is -0.055MPa. The raw material is melted into an alloy melt at 1400°C, and then the heating is stopped. When the temperature of the alloy melt reaches 1350° C., the alloy melt is cast to a cooling copper roll, and flakes are flaked into alloy flakes with a thickness of 0.2 mm. The alloy sheet was placed in a vacuum treatment furnace, and under the protection of an inert gas, heat treatment was carried out for 16 hours at a vacuum degree of -0.05Pa and a temperature of 950°C.

[0081] Table 1

[0082] serial number Hydrogen Storage Alloy Composition Example 1 LaG 2 Ni 7.7 mn 0.5 Al 0.3

Embodiment 14～26

[0084] The hydrogen storage alloys of Examples 1 to 14 were mechanically crushed into hydrogen storage alloy powders of 200 to 300 meshes, and the hydrogen storage alloy powders with a mass ratio of 1:4 were mixed with carbonyl nickel powder, and the diameters of 15mm were made under a pressure of 11MPa. negative electrode material. The negative electrode material was placed between two sheets of nickel foam, and a nickel strip as a tab was sandwiched at the same time, and then pressed under a pressure of 11 MPa to obtain an electrode. The spot welding around the negative electrode material ensures the close contact between the electrode sheet and the nickel foam. The electrochemical performance of the test is shown in Table 2.

[0085] Table 2

[0086]

[0087] N: the number of cycles required for the electrode to be fully activated;

[0088] C max : The maximum discharge capacity of the electrode;

[0089] S 100 : The capacity retention rate of the electrode for the...

Embodiment 27～39

[0091] The battery includes a battery case and a negative electrode, a positive electrode, a reference electrode, an electrolyte and a separator packaged in the battery case. Using the electrodes of Examples 14 to 26 as negative electrodes, sintered Ni(OH) with excess capacity 2 The / NiOOH electrode is the positive electrode, Hg / HgO is the reference electrode, 6mol / L KOH solution is used as the electrolyte, polyethylene is used as the diaphragm, and the battery is assembled.

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Abstract

The invention discloses an AB3 type gadolinium-containing hydrogen storage alloy, an electrode, a battery and a preparation method of the AB3 type gadolinium-containing hydrogen storage alloy. The gadolinium-containing hydrogen storage alloy comprises following composition: RaGdbNixMnyAlz, wherein R is selected from one or more of La, Ce, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc and Y; and a is greater than 0, b is greater than 0.1, a + b is equal to 3, x + y + z is greater than or equal to 9.5 and is greater than or equal to 7.8, y + z is greater than or equal to 4 and is greater than 0, and a, b, x, y and z correspondingly represent the atomic ratios of R, Gd, Ni, Mn and Al. The hydrogen storage alloy disclosed by the invention does not contain a magnesium element, and the capacity retention ratio is high when the hydrogen storage alloy is circulated for 100 times.

Description

technical field [0001] The present invention relates to an AB 3 Type gadolinium-containing hydrogen storage alloy, electrode, battery and preparation method thereof. Background technique [0002] As a new type of functional material, hydrogen storage alloys are widely used in the storage and transportation of hydrogen, the separation and purification of hydrogen, catalytic hydrogenation and dehydrogenation in synthetic chemistry, nickel-hydrogen batteries, hydrogen fuel vehicles, metal hydride compressors, Metal hydride heat pumps, air conditioning and refrigeration, hydride thermal pressure sensors and transmissions, etc. [0003] At present, the first-generation rare earth hydrogen storage alloy that has been commercialized is LaNi 5 (AB 5 ), its low energy density (about 330mAh / g) is difficult to meet the needs of Ni-MH batteries to develop to higher energy density. The second generation superlattice AB 3-3.8 Type La-Mg-Ni series rare earth hydrogen storage alloys ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C19/03C22C1/02C22F1/10C22F1/02H01M4/38H01M10/30
CPCC22C1/023C22C19/007C22C19/03C22C30/00C22C2202/04C22F1/02C22F1/10H01M4/383H01M10/30H01M2004/027Y02E60/10
Inventor 赵玉园周淑娟闫慧忠熊玮郑天仓王利张旭李金李宝犬徐津
Owner BAOTOU RES INST OF RARE EARTHS
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