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A long-life and high-capacity vanadium-based hydrogen storage alloy and its hydrogenation pulverization method

A hydrogen storage alloy, high-capacity technology, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the problems of low hydrogen storage capacity, difficulty in alloy powder making, and difficulty in obtaining powdered alloys, and achieve hydrogen absorption and desorption at room temperature. High capacity, suitable hydrogen absorption and desorption platform, and good composition uniformity

Active Publication Date: 2021-12-03
GRIMAT ENG INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, in order to ensure the stability of the hydrogen absorption and desorption cycle of the alloy, it is necessary to increase the vanadium content in the alloy. Our research group has carried out research on V-Fe alloys with high vanadium content in the early stage. 0.835 Fe 0.165 ) 88 Ti 12 -La 3 The reversible hydrogen storage capacity can reach 2.0wt%, and the capacity decays by 1% after 100 cycles, but its reversible hydrogen storage capacity is still low
[0004] In addition, due to the volume cubic structure of vanadium-based alloys showing good strength and toughness, especially when the vanadium content is high, it is difficult to obtain alloy powders by conventional mechanical crushing methods, while alloys obtained by conventional hydrogenation methods generally present scales , affects the hydrogen diffusion during the hydrogen absorption and desorption process of the alloy, and has a serious impact on the heat and mass transfer of the subsequent solid-state hydrogen storage system
[0005] The following problems still exist in the prior art TiV-based hydrogen storage materials: First, the hydrogen storage capacity is still low. Since the hydrogen storage performance of solid solution alloys is affected by multiple factors such as unit cell volume, electron concentration, and electronegativity, the currently developed It is difficult for alloys to meet high hydrogen storage capacity and good cycle performance at the same time; secondly, it is difficult to make alloy powder. Toughness, it is difficult to obtain powdered alloys by ordinary mechanical pulverization methods, and it is difficult to realize the large-scale application of hydrogen storage alloys

Method used

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  • A long-life and high-capacity vanadium-based hydrogen storage alloy and its hydrogenation pulverization method
  • A long-life and high-capacity vanadium-based hydrogen storage alloy and its hydrogenation pulverization method
  • A long-life and high-capacity vanadium-based hydrogen storage alloy and its hydrogenation pulverization method

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Experimental program
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Embodiment 1

[0032] The alloy composition is V 78 Ti 8 Al 1 mn 13 -1at% Ce, with pure metal vanadium, aluminum, titanium, manganese, cerium as the starting material, the purity of each element is higher than 99%, according to the nominal composition V 78 Ti 8 Al 1 mn 13 -1at% Ce ingredients, under the protection of high-purity argon (99.999%), use a vacuum non-consumable electric arc furnace to turn over and smelt 5 times to obtain an as-cast alloy; then anneal it at 1200 ° C for 24 hours under the protection of an inert gas, And do quenching treatment, quickly drop to room temperature, and make a hydrogen storage alloy ingot with a weight of about 40g. Place the alloy ingot in the sample tank, heat up to 200°C after evacuating for 30 min, slowly pass hydrogen into the sample chamber at a rate of 80 mL / min for 5 min, and keep it warm for 0.5 h, so that the sample absorbs hydrogen evenly. Continue to heat up to 400°C and vacuumize for 1 hour to dehydrogenate, and finally cool to room...

Embodiment 2

[0036] The alloy composition is V 80 Ti 6 Al 1 Cu13 -1at% Ce, with pure metal vanadium, titanium, aluminum, copper, cerium as the starting material, the purity of each element is higher than 99%, according to the nominal composition V 80 Ti 6 Al 1 Cu 13 -1at% Ce batching, then smelted into an alloy ingot weighing about 40g. The alloy ingot smelting method, hydrogenation pulverization method and structure analysis method are the same as in Example 1. Get V 80 Ti 6 Al 1 2g of Cu-1at%Ce alloy powder was used for hydrogen absorption and desorption performance test. The activation conditions of the alloy are as follows: evacuate at room temperature for 1 h, conduct hydrogen absorption kinetics test under 7 MPa hydrogen gas, and the initial pressure of the hydrogen release test system is 0.1 MPa.

[0037] The test results show that the first hydrogen absorption kinetics of the alloy after vacuuming at room temperature is good, the maximum hydrogen absorption capacity reach...

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Abstract

The invention discloses a long-life and high-capacity vanadium-based hydrogen storage alloy and a hydrogenation pulverization method thereof, which belong to the field of solid hydrogen storage materials and technologies. The alloy composition is V x Ti y Al z m 100‑x‑y‑z ‑1~3at%Ce, where x, y, z respectively represent the atomic number of V, Ti, Al, x=70‑90, y=2‑10, z=1‑5; M is Fe, Cu, Zn, A combination of one or more than two of Mn and Cr, heat treatment at 1000-1200°C for 24 hours after vacuum arc turning for 3-5 times, and then rapidly cooled to room temperature. The reversible hydrogen storage capacity of the alloy of the present invention at room temperature can reach more than 2.30wt%, and the alloy particles obtained by the hydrogenation pulverization are uniform in size, avoiding the scaly particles caused by uneven hydrogen absorption, and can be directly used for the preparation of hydrogen storage alloy beds , to provide a safe and efficient solid-state hydrogen source for fuel cells.

Description

technical field [0001] The invention belongs to the field of solid-state storage materials and technologies, and in particular relates to a long-life and high-capacity vanadium-based hydrogen storage alloy and a hydrogenation pulverization method thereof. Background technique [0002] Vanadium-based hydrogen storage alloy compared to rare earth LaNi 5 , TiFe, TiMn 2 The hydrogen storage alloy, which is widely used in the series, has the advantage of high hydrogen storage capacity, and its maximum hydrogen absorption at room temperature is higher than 3.0wt%. However, according to existing reports, the reversible hydrogen storage capacity of vanadium-based hydrogen storage alloys at room temperature is generally between 1.8-2.0wt%, which is not enough compared to the rare earth and titanium hydrogen storage alloys that have been used on a large scale. The price of vanadium is high. Therefore, considering the cost performance of alloys, vanadium-based hydrogen storage alloys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/02C22F1/18C22F1/02B22F9/02C01B3/00
CPCB22F9/023C01B3/0052C22C27/025C22F1/002C22F1/02C22F1/18Y02E60/32
Inventor 武媛方蒋利军叶建华袁宝龙郭秀梅李志念王树茂
Owner GRIMAT ENG INST CO LTD