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Preparation method of A2B7 type single-phase Pr-Mg-Ni based hydrogen storage alloy

A hydrogen storage alloy, single-phase technology, used in electrical components, circuits, battery electrodes, etc., can solve the problems of difficult controllable preparation of alloys with specific structures, inability to produce qualified products, serious volatilization, etc., and achieve high-rate discharge performance. , Not easy to volatilize loss, good electrochemical performance

Inactive Publication Date: 2019-03-29
湖南科霸汽车动力电池有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

while A 2 B 7 Pr–Mg–Ni-based hydrogen storage alloys have attracted widespread attention because of their good hydrogen storage performance and electrochemical performance. It is more serious, making it difficult to realize the controllable preparation of alloys with specific structures. In the preparation of A with a specific content of Mg element 2 B 7 Type Pr–Mg–Ni-based hydrogen storage alloys are often unable to produce qualified products with a set structure due to the volatilization of Mg element

Method used

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  • Preparation method of A2B7 type single-phase Pr-Mg-Ni based hydrogen storage alloy
  • Preparation method of A2B7 type single-phase Pr-Mg-Ni based hydrogen storage alloy
  • Preparation method of A2B7 type single-phase Pr-Mg-Ni based hydrogen storage alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A 2 B 7 The preparation method of type single-phase Pr-Mg-Ni-based hydrogen storage alloy is carried out according to the following steps:

[0023] ⅠIn an environment full of nitrogen, the precursors PrNi, Pr 2 Ni 3 And Mg 2 Ni was crushed and ground separately and passed through a 300-mesh sieve. The sieving time was 25min. Then the sieved PrNi and Pr 2 Ni 3 And Mg 2 Ni massager ratio 0.58:1.80:0.85 mixed;

[0024] Ⅱ Cold-press the mixed powder obtained in step I into small pieces under a pressure of 15 MPa. The small pieces are cylindrical, with a diameter of 1 cm and a height of 0.1 cm. The small pieces are wrapped and sealed with nickel metal tape and placed in a diameter of 10 cm. In a cylindrical stainless steel mold with a height of 6cm, the stainless steel mold is then sealed and placed in a vacuum tube furnace filled with 0.03Mpa nitrogen for sintering. The temperature of the vacuum tube furnace is first increased to 600°C and 700°C. And 800°C, and keep them at 600°...

Embodiment 2

[0029] A 2 B 7 Type single-phase Pr-Mg-Ni-based hydrogen storage alloy preparation method, and its steps are the same as those of A in Example 1. 2 B 7 The steps of the preparation method of the type single-phase Pr-Mg-Ni-based hydrogen storage alloy are basically the same, and the differences are:

[0030] 1. In step Ⅰ, the protective gas is argon, PrNi, Pr 2 Ni 3 And Mg 2 The molar ratio of Ni is 0.70:2.0:0.9;

[0031] 2. In step Ⅱ, the pressure of cold pressing of the mixed powder into small pieces is 10MPa, the diameter of the small pieces is 2cm, the height is 0.2cm, the diameter of the cylindrical stainless steel mold is 15cm, the height is 8cm, the protective gas is argon, and the protective gas pressure The sintering process is as follows: first increase the temperature of the vacuum tube furnace to 625°C, 725°C, and 825°C, and keep the temperature at 625°C, 725°C, and 825°C for 2 hours, and then put the vacuum tube furnace The temperature of the vacuum tube furnace is incr...

Embodiment 3

[0036] A 2 B 7 Type single-phase Pr-Mg-Ni-based hydrogen storage alloy preparation method, and its steps are the same as those of A in Example 1. 2 B 7 The steps of the preparation method of the type single-phase Pr-Mg-Ni-based hydrogen storage alloy are basically the same, and the differences are:

[0037] 1. In step I, the protective gas is helium, PrNi, Pr 2 Ni 3 And Mg 2 The molar ratio of Ni is 0.90:2.10:1.0;

[0038] 2. In step II, the pressure of cold pressing of mixed powder into small pieces is 20MPa, the protective gas is helium, and the protective gas pressure is 0.02MPa. The sintering process is as follows: first increase the temperature of the vacuum tube furnace to 610℃, 710 ℃ and 810℃, and keep them at 610℃, 710℃ and 810℃ respectively for 2h, then raise the temperature of the vacuum tube furnace to 925℃ and keep it for 102h, the heating rate of the vacuum tube furnace is 8℃ / min;

[0039] 3. The composition of the hydrogen storage alloy prepared is Pr 1.85 Mg 0.20 Ni 3....

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Abstract

The invention provides a preparation method of an A2B7 type single-phase Pr-Mg-Ni based hydrogen storage alloy. Under the environment full of protective gas, precursors PrNi, Pr2Ni3 and Mg2Ni are crushed and ground and are sieved, and the sieved PrNi, Pr2Ni3 and Mg2Ni are mixed according to the molar ratio being (0.60-0.90):(1.80-2.10):(0.85-1.0); mixed powder is subjected to cold pressing under certain pressure to form small sheets, the small sheets are wrapped by a nickel metal strip and are welded and sealed, the small pieces are placed in a cylindrical stainless steel mold with the diameter ranging from 10 cm to 15 cm and the height ranging from 6 cm to 8 cm, and then the stainless steel mold is sealed and is placed in a vacuum pipe type furnace filled with protective gas ranging from0.02 MPa to 0.04 MPa for sintering treatment; and finally products obtained after sintering treatment is cooled to room temperature, and the alloy is prepared through crushing and grinding-sieving. Bymeans of the method, the process is simple, feasible and stable, and the Mg content is controlled to be high.

Description

Technical field [0001] The present invention relates to an A 2 B 7 Method for preparing single-phase Pr-Mg-Ni-based hydrogen storage alloy. Background technique [0002] Hydrogen storage alloy is used as the negative electrode material of nickel-hydrogen battery, and its electrochemical performance directly affects the capacity and electrical performance of the battery. And A 2 B 7 Pr-Mg-Ni-based hydrogen storage alloys have received wide attention because of their good hydrogen storage and electrochemical properties. However, during the preparation of this alloy, the Mg element volatilizes during the sintering process due to its low melting point. It is more serious, making it more difficult to realize the controllable preparation of alloys with specific structures. In the preparation of A with specific content of Mg 2 B 7 Type Pr-Mg-Ni-based hydrogen storage alloys often fail to produce qualified products with a set structure due to the volatilization of Mg elements. Summary o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C28/00C22C1/04H01M4/38
CPCB22F2998/10C22C1/04C22C28/00C22C2202/04H01M4/383B22F9/04B22F3/02B22F3/1007Y02E60/10
Inventor 钟发平丁艳巧匡德志柳立新胡向宇李华钟巍
Owner 湖南科霸汽车动力电池有限责任公司