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A method and device for improving the performance of mg2ni type hydrogen storage alloy

A hydrogen storage alloy and alloy technology, applied in the field of rapid solidification treatment to prepare Mg2Ni type hydrogen storage alloys, can solve the problems of reduced alloy capacity and kinetic properties, inability to mass-produce, poor cycle performance, etc., to achieve improved electrochemical discharge Capacity and kinetic performance, increase in electrochemical capacity and cycle life, and the effect of improving kinetic performance at room temperature

Active Publication Date: 2016-01-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the mechanical alloying method is time-consuming and labor-intensive, and cannot be produced on a large scale. The amorphous and nanocrystalline structures obtained by ball milling are metastable structures, and the cycle performance is very poor.
The melt rapid quenching method can improve the uniformity of the alloy composition, reduce the lattice stress, improve the corrosion resistance and anti-powdering ability of the alloy, but the rapid quenching often reduces the capacity and dynamic properties of the alloy

Method used

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  • A method and device for improving the performance of mg2ni type hydrogen storage alloy
  • A method and device for improving the performance of mg2ni type hydrogen storage alloy
  • A method and device for improving the performance of mg2ni type hydrogen storage alloy

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Experimental program
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Effect test

Embodiment 1

[0036] The alloy composition used is Mg 2 Ni. Grind the hydrogen storage alloy to remove the surface oxide film and impurities, and knock the alloy into small pieces and place it in a quartz tube with a hole diameter of 1mm at the lower end, and put it into the above device. The distance between the lower end of the quartz tube and the surface of the copper roller is 1mm. When preparing samples, vacuumize the melting chamber to 20-30Pa and then fill it with high-purity argon gas with a purity of 99.999%. After repeating 3 times, fill it with argon gas until the pressure gauge in the main cavity shows -0.04MPa. After the master alloy is completely melted by induction heating, the alloy melt is sprayed under the pressure of 0.08MPa onto the surface of a copper roller rotating at a line speed of 10m / s to quickly solidify, and a thin strip of Mg 2 Ni hydrogen storage alloy. Afterwards, the prepared hydrogen storage alloy strips were ground and sieved under argon protection in a ...

Embodiment 2

[0038] The alloy composition used is Mg 2 Ni. Grind the hydrogen storage alloy to remove the surface oxide film and impurities, and knock the alloy into small pieces and place it in a quartz tube with a hole diameter of 1mm at the lower end, and put it into the above device. The distance between the lower end of the quartz tube and the surface of the copper roller is 1.5mm . When preparing samples, vacuumize the melting chamber to 20-30Pa and then fill it with high-purity argon gas with a purity of 99.999%. After repeating 3 times, fill it with argon gas until the pressure gauge in the main cavity shows -0.04MPa. After the master alloy is completely melted by induction heating, the alloy melt is sprayed under the pressure of 0.08MPa onto the surface of a copper roller rotating at a line speed of 20m / s to rapidly solidify, and the thin strip-shaped Mg 2 Ni hydrogen storage alloy. Afterwards, the prepared hydrogen storage alloy strips were ground and sieved under argon protec...

Embodiment 3

[0040] The alloy composition used is Mg 2 Ni 0.9 mn 0.1 . Grind the hydrogen storage alloy to remove the surface oxide film and impurities, and knock the alloy into small pieces and place it in a quartz tube with a hole diameter of 1mm at the lower end, and put it into the above device. The distance between the lower end of the quartz tube and the surface of the copper roller is 1.5mm . When preparing samples, vacuumize the melting chamber to 20-30Pa and then fill it with high-purity argon gas with a purity of 99.999%. After repeating 3 times, fill it with argon gas until the pressure gauge in the main cavity shows -0.04MPa. After the master alloy is completely melted by induction heating, the alloy melt is sprayed under the pressure of 0.08MPa onto the surface of a copper roller rotating at a line speed of 20m / s to rapidly solidify, and the thin strip-shaped Mg 2 Ni 0.9 mn 0.1 hydrogen storage alloy. Afterwards, the prepared hydrogen storage alloy strips were ground an...

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Abstract

The invention relates to a method and device for improving the performance of a Mg2Ni type hydrogen storing alloy, and the constituent of the alloy is Mg2Ni(1-x)Mnx (x is equal to 0-0.2). The method mainly comprises the following steps of: preparing Mg2Ni(1-x)Mnx (x is equal to 0-0.2) by adopting an induction melting method; removing an oxidization layer from the cast-condition Mg2Ni(1-x)Mnx, then crushing into chips and placing into a quartz tube, laying aside the quartz tube into a vacuum belt thrower, vacuumizing and filling argon; heating to fuse the alloy, injecting from the orifice of the quartz tube into a high-speed rotating water-cooling copper roll for fast solidification under a certain pressure; applying the static magnetic field with adjustable strength during the solidification process; and grinding and screening the prepared alloy sample in a glove box under the protection of argon, thereby obtaining the needed hydrogen storing alloy. The Mg2Ni type hydrogen storing alloy prepared has higher electrochemical capacity, and the cycling performance is better improved.

Description

technical field [0001] The invention relates to a method for preparing Mg by rapid solidification treatment under the action of a magnetic field 2 The invention relates to a Ni-type hydrogen storage alloy method and a matching device, which belong to the technical field of metal functional materials. Background technique [0002] Magnesium-based hydrogen storage alloys are considered to be the most promising metal hydrogen storage materials due to their high theoretical capacity and abundant resources, especially Mg 2 The Ni-type hydrogen storage alloy has a hydrogen absorption and desorption capacity as high as 3.6% (wt%) and an electrochemical capacity of 999mAh / g. However, because its hydride is quite stable, and Mg is easily corroded in alkaline solution to form Mg(OH) 2 , resulting in a very low actual electrochemical capacity (less than 50mAh / g) and poor cycle performance. Currently, common improved Mg 2 The methods for the hydrogen storage performance of Ni-type h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F3/02B22D27/02
Inventor 唐有根蒋晨曦王海燕彭志光卢周广
Owner CENT SOUTH UNIV
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