CN106521382B - A kind of single-phase superlattices A5B19The preparation method of type La Mg Ni base hydrogen-storing alloys - Google Patents
A kind of single-phase superlattices A5B19The preparation method of type La Mg Ni base hydrogen-storing alloys Download PDFInfo
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- CN106521382B CN106521382B CN201610970841.4A CN201610970841A CN106521382B CN 106521382 B CN106521382 B CN 106521382B CN 201610970841 A CN201610970841 A CN 201610970841A CN 106521382 B CN106521382 B CN 106521382B
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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Abstract
A kind of single-phase superlattices A5B19Alloy cast ingot is mainly put into stainless steel hermetically sealed can by the preparation method of type La Mg Ni base hydrogen-storing alloys, its method, and it is 1 to control the spatial volume of alloy and hermetically sealed can ratio:2, then, isothermal holding is carried out in the lehr, composition is controlled by the volatilization for regulating and controlling magnesium metal.Specifically annealing process is：First, with 10~15 DEG C/min heating rate from room temperature to 550 DEG C, 2 hours are incubated；Then, 980 DEG C then with 5~8 DEG C/min heating rate are continuously heating to, soaking time is 20~24h；Finally, taken out after the alloy after above-mentioned annealing being naturally cooled into room temperature.Present device is simple, technical maturity is stable, is advantageous to industrialize practical application, obtained A5B19Type phase structure alloy can use directly as nickle/metal hydrides cell negative electrode material, and alloy has higher discharge capacity, multiplying power discharging property and cyclical stability.
Description
Technical field：
The invention belongs to field of material technology, more particularly to a kind of electrode material preparation method.
Background technology：
The quick consumption of fossil energy and the environmental problem increasingly sharpened cause us the demand to clean energy resource increasingly to compel
Cut, it is extremely urgent to substitute traditional fossil energy using clean energy resource.High power, low cost, long-life and environmentally friendly two
The development progress of secondary electrokinetic cell largely decides the process converted from traditional fossil energy to novel energy.Its
In, Ni/MH batteries are because the advantage such as high safety, overcharging resisting/discharge performance be good under high power density, high pressure is in Large Electric work
Tool especially electric automobile, hybrid electric vehicle etc. still gains great popularity.
In the development of Ni/MH batteries, the research and development of electrode material are receive much concern the problem of all the time.In recent years
Come, La-Mg-N base hydrogen-storing alloys are received significant attention as Ni/MH cell negative electrode materials due to higher capacity.It is this kind of
Alloy often contains the alloy phase with stacking provisions, and these alloys are mutually to prolong c-axis direction stacking by subunit and subunit to form.
According to the difference of two kinds of subunit stacking heap ratios, AB can be divided into again3Type phase ([A2B4]/[AB5]=1:1), A2B7([A2B4]/
[AB5]=1:2) type phase and A5B19Type phase ([A2B4]/[AB5]=1:3) etc..Wherein with A5B19It is mutually the alloy of principal phase, has
More superior high-rate discharge ability, and cycle life is preferable.But the premise of practical application is to obtain single-phase alloy, and this
Kind of alloy mutually belongs to high-temperature-phase, easy excessive temperature or crosses low temperature and decomposes (840 DEG C of reaction：La4MgNi19→LaNi5+
(La,Mg)2Ni7；La4MgNi19→LaNi5+ liquid phase), so abundance in the alloy is generally relatively low.In addition due to
The peritectic reaction temperature of composition and each phase between La-Mg-N based alloy stacking phases is close, so A5B19Type single-phase alloy
Obtain very difficult.
Up to the present, small part research prepares A by powder sintered and annealing method5B19Type single-phase alloy
[QA Zhang MH Fang,TZ Si,F Fang,DL Sun,LZ Ouyang,M Zhu,Phase Stability,
Structural Transition, and Hydrogen Absorption-Desorption Features of the
Polymorphic La4MgNi19Compound,J.Phys. Chem.C 2010,114,11686.].2015, our problems
Group Zhao Yumeng [Y.M.Zhao, S.M.Han, Y.Li, J.J.Liu, L. Zhang, S.Q.Yang, D.D.Ke,
Characterization and improvement of electrochemical properties of Pr5Co19-
type single-phase La0.84Mg0.16Ni3.80alloy,Electrochimica Acta 152(2015)265–
273] it is prepared for comprising only 2H types A also by the method for powder step sintering5B19The La-Mg-Ni based alloys of phase.But so far
Untill, by the cast alloy for preparing industrialized conventional induction melting method preferably regulate and control its component Mg volatilization
The heat treatment technics of amount, prepare single-phase A5B19The La-Mg-Ni based alloys of type, have no report.
The content of the invention：
It is an object of the invention to provide a kind of equipment is simple, single-phase superlattices A of process stabilizing5B19Type La-Mg-Ni bases
The preparation method of hydrogen-storage alloy.The present invention mainly uses the method made annealing treatment after induction melting, is prepared for a kind of tool
There are the La-Mg-Ni base hydrogen-storing alloys of high circulation stability and multiplying power discharging property.
The method of the present invention comprises the following specific steps that：
(1) it is raw material to select metal simple-substance or alloy cpd, according to La0.78Mg0.22Ni3.72Alloy composition is carried out
Dispensing, then, alloy cast ingot is prepared using the method for conventional Medium frequency induction melting；
(2) take the alloy cast ingot of above-mentioned acquisition to be put into stainless steel hermetically sealed can, control the spatial volume of alloy and hermetically sealed can
Than for 1:2, then hermetically sealed can is sealed；
(3) it is placed in annealing furnace and is made annealing treatment under the protection of 0.05MPa argon gas atmospheres：First, with 10~15 DEG C/
Min heating rate is incubated 2 hours from room temperature to 550 DEG C；Then, then with 5~8 DEG C/min heating rate continue to rise
For temperature to 980 DEG C, soaking time is 20~24h；Finally, taken out after the alloy after above-mentioned annealing being naturally cooled into room temperature.
The present invention has the following advantages that compared with prior art：
1st, the heat treatment method of magnesium volatilization, effective solution are controlled by the alloy cast ingot obtained to conventional induction melting
Determine La-Mg-Ni base hydrogen-storing alloy composition control problems, realized single-phase superlattices A5B19Type La-Mg-Ni base hydrogen-storing alloys
Prepare.The technology has the characteristics of equipment and technique simple and stable, is advantageous to industrialize practical application；
2nd, the single-phase A prepared5B19Type La-Mg-Ni based alloys have higher discharge capacity, multiplying power discharging property and circulation
Stability, its maximum discharge capacity are more than 370mAh/g, the high-rate discharge ability under 1500mA/g discharge current density
Capability retention more than 55%, 100 week is more than 80%, can be as the negative material of Ni/MH batteries.
Brief description of the drawings：
Fig. 1 is La-Mg-Ni base hydrogen-storing alloy X-ray diffractograms prepared by the embodiment of the present invention 1,2 and 3.
Fig. 2 is discharge capacity and the circulating cycle of La-Mg-Ni base hydrogen-storing alloy electrodes prepared by the embodiment of the present invention 1,2 and 3
Number graph of relation.
Fig. 3 is the high-rate discharge ability of La-Mg-Ni base hydrogen-storing alloy electrodes prepared by the embodiment of the present invention 1,2 and 3
(HRD) curve map.
Embodiment：
Embodiment 1
The La for taking 50 grams of induction meltings to obtain0.78Mg0.22Ni3.72Alloy cast ingot, wrapped up and welded with metal nickel sheet and be close
The spatial volume of envelope, alloy cast ingot and hermetically sealed can is 1:2.It is subsequently placed in vacuum annealing furnace, annealing furnace is evacuated to-
0.10MPa, argon gas is then charged with to 0.05MPa.Start heating schedule, first, with 10 DEG C/min heating rate from room temperature liter
Temperature is incubated 2 hours at this temperature to 550 DEG C；Then, then with 8 DEG C/min heating rate it is continuously heating to 900 DEG C, and
It is incubated 24h；Finally, taken out after the alloy after above-mentioned annealing being naturally cooled into room temperature.
By alloy sample obtained above after mechanical crushing and grinding, the alloy powder that average particle diameter is less than 37 μm is taken
XRD diffraction analysis is carried out, as shown in figure 1, the alloy obtained is that have pure A5B19Type phase structure.Meanwhile take average particle diameter
Nickel-hydrogen battery negative pole pole piece is made for 37~74 μm of pressed powders, positive pole uses hickelous nydroxide (Ni (OH)2/ NiOOH) electricity
Pole piece, electrolyte are 6mol L-1The KOH aqueous solution, be made opening bipolar electrode simulated experiment battery system.Surveyed using DC-5 batteries
Instrument test chemical property is tried, as shown in Fig. 2 the maximum discharge capacity of alloy is 372mAh/g, the capacity after the circle of circulation 100 is protected
Holdup is 85.3%；As shown in figure 3, the high-rate discharge ability of alloy is when discharge current density is 1500mA/g
62.4%.
Embodiment 2
The La for taking 70 grams of induction meltings to obtain0.78Mg0.22Ni3.72Alloy cast ingot, wrapped up and welded with metal nickel sheet and be close
The spatial volume of envelope, alloy cast ingot and hermetically sealed can is 1:2.It is subsequently placed in vacuum annealing furnace, annealing furnace is evacuated to-
0.10MPa, argon gas is then charged with to 0.05MPa.Start heating schedule, first, with 12 DEG C/min heating rate from room temperature liter
Temperature is incubated 2 hours at this temperature to 550 DEG C；Then, then with 5 DEG C/min heating rate it is continuously heating to 900 DEG C, and
It is incubated 22h；Finally, taken out after the alloy after above-mentioned annealing being naturally cooled into room temperature.
By alloy sample obtained above after mechanical crushing and grinding, the alloy powder that average particle diameter is less than 37 μm is taken
XRD diffraction analysis is carried out, as shown in figure 1, the alloy obtained is that have pure A5B19Type phase structure.Meanwhile take average particle diameter
Nickel-hydrogen battery negative pole pole piece is made for 37~74 μm of pressed powders, positive pole uses hickelous nydroxide (Ni (OH)2/ NiOOH) electricity
Pole piece, electrolyte are 6mol L-1The KOH aqueous solution, be made opening bipolar electrode simulated experiment battery system, utilize DC-5 batteries survey
Instrument test chemical property is tried, as shown in Fig. 2 the maximum discharge capacity of alloy is 380mAh/g, the capacity after the circle of circulation 100 is protected
Holdup is 83.5%；As shown in figure 3, when discharge current density is 1500mA/g, the high-rate discharge ability of alloy is
58.4%.
Embodiment 3
The La for taking 100 grams of induction meltings to obtain0.78Mg0.22Ni3.72Alloy cast ingot, wrapped up and welded with metal nickel sheet
The spatial volume of sealing, alloy cast ingot and hermetically sealed can is 1:2.It is subsequently placed in vacuum annealing furnace, annealing furnace is evacuated to-
0.10MPa, argon gas is then charged with to 0.05MPa.Start heating schedule, first, with 15 DEG C/min heating rate from room temperature liter
Temperature is incubated 2 hours at this temperature to 550 DEG C；Then, then with 6 DEG C/min heating rate it is continuously heating to 900 DEG C, and
It is incubated 20h；Finally, taken out after the alloy after above-mentioned annealing being naturally cooled into room temperature.
By alloy sample obtained above after mechanical crushing and grinding, the alloy powder that average particle diameter is less than 37 μm is taken
XRD diffraction analysis is carried out, as shown in figure 1, the alloy obtained is that have pure A5B19Type phase structure.Meanwhile take average particle diameter
Nickel-hydrogen battery negative pole pole piece is made for 37~74 μm of pressed powders, positive pole uses hickelous nydroxide (Ni (OH)2/ NiOOH) electricity
Pole piece, electrolyte are 6mol L-1The KOH aqueous solution, be made opening bipolar electrode simulated experiment battery system.Surveyed using DC-5 batteries
Instrument test chemical property is tried, as shown in Fig. 2 the maximum discharge capacity of alloy is 387mAh/g, the capacity after the circle of circulation 100 is protected
Holdup is 80.1%；As shown in figure 3, when discharge current density is 1500mA/g, the high-rate discharge ability of alloy is
55.6%.
Claims (1)
- A kind of 1. single-phase superlattices A5B19The preparation method of type La-Mg-Ni base hydrogen-storing alloys, it is characterised in that：It is specifically prepared Step is as follows:(1) it is raw material to select metal simple-substance or alloy cpd, according to La0.78Mg0.22Ni3.72Alloy composition carries out dispensing, Then, alloy cast ingot is prepared using the method for conventional Medium frequency induction melting；(2) take the alloy cast ingot of above-mentioned acquisition to be put into stainless steel hermetically sealed can, control the spatial volume of the alloy and hermetically sealed can ratio to be 1:2, then hermetically sealed can is sealed；(3) it is placed in annealing furnace and is made annealing treatment under the protection of 0.05MPa argon gas atmospheres：First, with 10~15 DEG C/min's Heating rate is incubated 2 hours from room temperature to 550 DEG C；Then, then with 5~8 DEG C/min heating rate it is continuously heating to 980 DEG C, soaking time is 20~24h；Finally, taken out after the alloy after above-mentioned annealing being naturally cooled into room temperature.
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| CN108172807B (en) * | 2018-01-10 | 2020-04-28 | 包头中科轩达新能源科技有限公司 | Multi-element single-phase A5B19Superlattice hydrogen storage alloy electrode material and preparation method thereof |
| CN108172817B (en) * | 2018-01-10 | 2020-01-24 | 包头中科轩达新能源科技有限公司 | Single-phase Gd2Co7Rare earth magnesium-nickel hydrogen storage alloy, preparation method and application thereof |
| CN108493436B (en) * | 2018-03-09 | 2021-01-08 | 燕山大学 | 2H-type A5B19 super-stacking structure lanthanum-M-magnesium-nickel-based quaternary hydrogen storage alloy electrode material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11100601A (en) * | 1997-09-29 | 1999-04-13 | Sanyo Electric Co Ltd | Hydrogen storage alloy grain and its production |
| JP2009299172A (en) * | 2008-06-17 | 2009-12-24 | Sanyo Electric Co Ltd | Hydrogen storage alloy and alkali storage battery |
| JP2014229593A (en) * | 2013-05-27 | 2014-12-08 | 三洋電機株式会社 | Alkali storage battery |
| CN104745877A (en) * | 2013-12-26 | 2015-07-01 | 青岛玉光精铸厂 | Heat treatment technology of La-Mg-Ni series A5B19 phase hydrogen storage alloy |
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- 2016-10-28 CN CN201610970841.4A patent/CN106521382B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11100601A (en) * | 1997-09-29 | 1999-04-13 | Sanyo Electric Co Ltd | Hydrogen storage alloy grain and its production |
| JP2009299172A (en) * | 2008-06-17 | 2009-12-24 | Sanyo Electric Co Ltd | Hydrogen storage alloy and alkali storage battery |
| JP2014229593A (en) * | 2013-05-27 | 2014-12-08 | 三洋電機株式会社 | Alkali storage battery |
| CN104745877A (en) * | 2013-12-26 | 2015-07-01 | 青岛玉光精铸厂 | Heat treatment technology of La-Mg-Ni series A5B19 phase hydrogen storage alloy |
Non-Patent Citations (2)
| Title |
|---|
| Characterization and improvement of electrochemical properties of Pr5Co19-type single-phase La0.84Mg0.16Ni3.80 alloy;Yumeng Zhao等;《Electrochimica Acta》;20141124;第152卷;第265–273页 * |
| Phase Structure and Electrochemical Characteristics of Rhombohedral Super-Stacking La0.77Mg0.23Ni3.72 Hydrogen Storage Alloy;Wenkai Du等;《Journal of The Electrochemical Society》;20150812;第162卷(第10期);第2180-2187页 * |
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