Microwave annealing method for improving electrochemistry property of hydrogen storage alloy M1(NiCoMnAlCu)5.05

A technology for hydrogen storage alloy and microwave annealing is applied in the fields of hydrogen storage material, microwave technology and metal material heat treatment, which can solve problems such as difficulties and achieve the effects of reducing activation times, improving comprehensive electrochemical performance and short annealing time.

Inactive Publication Date: 2009-02-11
SHANGHAI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Microwaves are not suitable for heating a

Method used

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  • Microwave annealing method for improving electrochemistry property of hydrogen storage alloy M1(NiCoMnAlCu)5.05
  • Microwave annealing method for improving electrochemistry property of hydrogen storage alloy M1(NiCoMnAlCu)5.05

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Experimental program
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Effect test

Embodiment 1

[0015] Weigh 3.0g Ml(NiCoMnAlCu) of 300~400 mesh 5.05 The hydrogen storage alloy powder is made into tablets on a tablet press with a pressure of 10 MPa, and the holding time is 10 minutes. The hydrogen storage alloy flakes are small discs with a diameter of 10 mm and a thickness of 5 mm. The pressed hydrogen storage alloy sheet is placed in the cavity of a microwave oven, and several sheets of MoC are placed around it as an auxiliary heat material. During the microwave annealing process, under the protection of argon, the annealing temperature was 300°C, and the temperature was kept for 14 minutes. After annealing, it was cooled to room temperature with the furnace, and then the obtained hydrogen storage alloy was subjected to electrochemical experiments. The results showed that the activation times of the alloy were 15 times (As-cast state) is reduced to 2 times (after microwave heat treatment), the maximum discharge capacity is 291.1mAh / g, and the capacity decay rate after ...

Embodiment 2

[0017] Weigh 3.0g Ml(NiCoMnAlCu) of 300~400 mesh 5.05 The hydrogen storage alloy powder was made into tablets on a tablet press with a pressure of 15 MPa, and the holding time was 7 minutes. Place the pressed hydrogen storage alloy sheet in the cavity of a microwave oven, and place several sheets of SiC around it as an auxiliary heat material. During the microwave annealing process, under the protection of argon, the annealing temperature was 350°C, and the heat preservation time was 12 minutes. state) to 4 times (after microwave heat treatment), the maximum discharge capacity is 298.4mAh / g, and the capacity decay rate after 200 electrochemical cycles is only 0.154.

Embodiment 3

[0019] Weigh 3.0g Ml(NiCoMnAlCu) of 300~400 mesh 5.05 The hydrogen storage alloy powder was made into tablets on a tablet machine with a pressure of 15 MPa, and the holding time was 4 minutes. Place the pressed hydrogen storage alloy sheet in the cavity of a microwave oven, and place several sheets of SiC around it as an auxiliary heat material. During the microwave annealing process, under the protection of argon, the annealing temperature was 400°C, and the heat preservation time was 10 minutes. state) to 5 times (after microwave heat treatment), the maximum discharge capacity is 305.5mAh / g, and the capacity decay rate after 200 electrochemical cycles is only 0.145.

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Abstract

The invention provides a microwave annealing method for improving electrochemical properties of a hydrogen storage alloy Ml(NiCoMnAlCu)5.05, which belongs to the technical field of hydrogen storage materials. The technical process of the method is as follows: 300-400 meshes of hydrogen storage alloy Ml(NiCoMnAlCu)5.05 powder is pressed into an alloy sheet by a sheeter at the pressure of 10-20MPa, then the alloy sheet is put into a microwave oven and is surrounded by a plurality of pieces of auxiliary heating materials, is annealed at the temperature of 300-500 DEG C; and then is cooled to the room temperature with the oven under the protection of argon gas or under vacuum condition for 6-14 minutes. The microwave annealing method is characterized by low annealing temperature, short time, low energy consumption and greatly decreasing the product cost. The hydrogen storage alloy treated by the method has smaller particle size, and the comprehensive electrochemical properties of the alloy are improved, more particularly, the activation times are greatly reduced, and the charge and discharge cycle life is significantly prolonged.

Description

technical field [0001] The invention belongs to the technical fields of hydrogen storage materials, microwave technology and metal material heat treatment, and specifically provides a method for improving AB by using microwaves with high-efficiency heating characteristics. 5 Microwave annealing method for electrochemical properties of hydrogen storage alloys. Background technique [0002] Rare Earth AB 5 Type hydrogen storage alloys have attracted extensive attention due to their easy activation, low hydrogen absorption and desorption platform pressure, and good comprehensive electrochemical properties. Although AB 5 Type hydrogen storage alloys have been mass-produced and applied in many countries, but reducing the cost of alloys and improving their electrochemical performance have always been pursued by everyone. Researchers have improved the activation performance, electrochemical capacity and cycle life of alloys by using element substitution, rapid solidification, ra...

Claims

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Application Information

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IPC IPC(8): C22F1/00
Inventor 李谦李强孟杰刘杨林根文周国治
Owner SHANGHAI UNIV
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