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Single-phase super-stacking structured Pr-Mg-Ni-based hydrogen storage alloy and preparation method therefor

A hydrogen storage alloy stacking technology, which is applied in the field of hydrogen storage alloy electrode materials and its preparation, can solve the problems of unsatisfactory cycle stability and achieve good electrochemical cycle stability, simple equipment process, and complete crystal form.

Active Publication Date: 2016-12-07
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the alloy is not a pure single-phase structure, its cycle stability is not ideal enough
There is currently no Pr 5 co 19 Research Report on Pr–Mg–Ni Based Hydrogen Storage Alloys with Type Single Phase Superstacking Structure

Method used

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  • Single-phase super-stacking structured Pr-Mg-Ni-based hydrogen storage alloy and preparation method therefor
  • Single-phase super-stacking structured Pr-Mg-Ni-based hydrogen storage alloy and preparation method therefor
  • Single-phase super-stacking structured Pr-Mg-Ni-based hydrogen storage alloy and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] PrNi melted conventionally by induction 2 , MgNi 2 and PrNi 5 The precursor was mechanically crushed through a 300-mesh sieve under the protection of an argon atmosphere, and 1.2555 grams of PrNi 2 , 0.6887 g MgNi 2 and 1.0557 g of PrNi 5 Put the alloy powder into an agate mortar, mix the above alloy powder evenly in the glove box, and then cold press it into an alloy blank under a pressure of 10MPa, wrap it with nickel metal tape and weld it to seal; put the sealed alloy blank into an open vacuum tube After a vacuum pumping and two argon washings, the furnace was vacuum pumped and filled with 0.01MPa argon for sintering treatment: first, from room temperature to 600 ° C, 700 ° C and 800 ° C, and at each temperature point Each heat preservation for 1h; then, reheat to 950°C and heat preservation for 96h; the sintered alloy product is naturally cooled to room temperature with the furnace, and the composition of Pr 0.82 Mg 0.16 Ni 3.82 Pr 5 co 19 type single-phas...

Embodiment 2

[0028] PrNi melted conventionally by induction 2 , MgNi 2 and PrNi 5 The precursor was mechanically crushed through a 300-mesh sieve under the protection of an argon atmosphere, and 1.3308 grams of PrNi 2 , 0.6282 g MgNi 2 and 1.0410 g PrNi 5 Put the alloy powder into an agate mortar, mix the above alloy powder evenly in the glove box, and then cold press it into an alloy blank under a pressure of 10MPa, wrap it with nickel metal tape and weld it to seal; put the sealed alloy blank into an open vacuum tube After a vacuum pumping and two argon washes, the furnace was vacuum pumped, filled with 0.02MPa argon gas for partition sintering and annealing treatment: first, from room temperature to 600 ° C, 700 ° C and 800 ° C, and at each Each temperature point was kept for 1h; then, it was heated to 950°C and kept for 100h; the sintered alloy product furnace was naturally cooled to room temperature, and the composition of Pr 0.85 Mg 0.15 Ni 3.80 Pr 5 co 19 type single-phase ...

Embodiment 3

[0033] PrNi melted conventionally by induction 2 , MgNi 2 and PrNi 5 The precursor was mechanically crushed through a 300-mesh sieve under the protection of an argon atmosphere, and 1.4280 g of PrNi 2 , 0.5500 g MgNi 2 and 1.0219 g of PrNi 5 Put the alloy powder into an agate mortar, mix the above alloy powder evenly in the glove box, and then cold press it into an alloy blank under a pressure of 15MPa, wrap it with nickel metal tape and weld it to seal; put the sealed alloy blank into an open vacuum tube After one vacuum pumping and two argon washes, the furnace was vacuum pumped, filled with 0.03MPa argon gas for partition sintering and annealing treatment: first, from room temperature to 600°C, 700°C and 800°C, and at each Each temperature point was kept for 1h; then, it was heated to 950°C and kept for 104h; the sintered alloy product was naturally cooled to room temperature with the furnace, and the composition of Pr was obtained. 0.87 Mg 0.13 Ni 3.78 Pr 5 co 19 ...

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Abstract

Disclosed is a single-phase super-stacking structured Pr-Mg-Ni-based hydrogen storage alloy. The chemical formula of the hydrogen storage alloy is Pr<x>Mg<y>Ni<z>, wherein x, y and z are atomic ratios, and x is greater than or equal to 0.82 and less than or equal to 0.9; y is greater than or equal to 0.1 and less than or equal to 0.18; z is greater than or equal to 3.76 and less than or equal to 3.82; the preparation method for the alloy comprises the steps of performing mechanical crushing on PrNi<2>, MgNi<2> and PrNi<5> by an ingot casting machine, uniformly mixing at the molar ratio of PrNi<2> to MgNi<2> to PrNi<5> of 2.0-2.5 to 1.5-2.0 to 1, and cold pressing to obtain an alloy blank; wrapping the alloy blank with a nickel metal strap, and welding and sealing, and sintering the processed alloy blank under protection of argon at the pressure of 0.01-0.04MPa, heating from the room temperature to 600, 700 and 800 DEG C, and performing thermal insulation for 1h at each temperature point separately; and then heating to 950 DEG C, and performing thermal insulation for 96-108h, and carrying out furnace cooling to the room temperature to obtain the Pr<5>Co<19> type single-phase super-stacking structured Pr-Mg-Ni-based hydrogen storage alloy. The process is simple and reliable; and the prepared hydrogen storage alloy has the advantages of complete crystal form, stable structure, uniform ingredients, and high electrochemical circulation stability.

Description

Technical field: [0001] The invention belongs to the field of electrode materials, in particular to a hydrogen storage alloy electrode material and a preparation method thereof. Background technique: [0002] Because new energy vehicles can achieve "zero emission" in the true sense, they have received great attention at home and abroad. As a high-energy green battery, nickel / metal hydride battery has been widely studied for its high energy density, resistance to overcharge and overdischarge, and good cycle stability. RE–Mg–Ni-based hydrogen storage alloys (RE=La, Ce, Pr, Nd, Sm) with a superstacked structure are considered promising alternatives due to their high discharge capacity and good high-rate performance. Traditional AB 5 A new generation of nickel / metal hydride secondary battery anode materials based on hydrogen storage alloys. A large number of studies at home and abroad have shown that RE–Mg–Ni-based hydrogen storage alloys with superstacking structures are com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/30
CPCH01M4/383H01M10/30Y02E60/10
Inventor 韩树民丁艳巧张璐赵鑫石和
Owner YANSHAN UNIV