CN104726747A - Chemical improvement method of performances of La-Mg-Ni serial hydrogen storage alloy - Google Patents
Chemical improvement method of performances of La-Mg-Ni serial hydrogen storage alloy Download PDFInfo
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- CN104726747A CN104726747A CN201310712757.9A CN201310712757A CN104726747A CN 104726747 A CN104726747 A CN 104726747A CN 201310712757 A CN201310712757 A CN 201310712757A CN 104726747 A CN104726747 A CN 104726747A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
Hot alkali treatment affects the electrochemical performances of La-Mg-Ni serial A2B7 type hydrogen storage alloy electrodes. The hot alkali treatment is carried out after alloy melting annealing, so the content of nickel in the surfaces of alloy particles increases with the dissolving of La, Mg, Al and other elements in a surface layer to realize strong activation performances.
Description
Technical field
The present invention relates to a kind of improvement in performance method of hydrogen storage alloy, particularly relate to a kind of improvement in performance of La-Mg-Ni base hydrogen storage alloy.
Background technology
In recent years, the fundamental research of hydrogen storage alloy and Application and Development achieve the progress attracted people's attention, and have become the important branch of field of functional materials.Wherein, AB5 type mixed rare-earth hydrogen-bearing alloy achieves large-scale industrialization in China as the Ni-MH secondary battery of negative material.The intrinsic hydrogen-storage amount of AB5 type alloy is lower (1.4 wt%), and the loading capacity of commodity electrode metal is close to its theoretical capacity limits (372 mAh/g), think that raising is more difficult further, be difficult to adapt to further developing of Ni-MH battery.Therefore, studying novel high-capacity hydrogen storage electrode alloy is the important means improving Ni-MH Battery Market competitive power further.For raising capacity, what most one of was wished is La-Mg-Ni base hydrogen storage alloy, and loading capacity reaches about 400 mAh/g, and with low cost.Although La-Mg-Ni base hydrogen storage alloy has competitive power in loading capacity, its cycle life is poor, becomes the bottleneck of this ladle refining practical application.How the basis keeping alloy high-capacity improves key problem that its electrochemistry cycle life is research further.
Research show alloy surface through overrich or heat NaOH process after, along with the dissolving of the elements such as Mg, Al in upper layer, form at electrode surface the rich nickel dam that one deck has higher catalytic activity, improve the conductive capability between alloy powder, improve activation performance and the high-rate discharge capacity of electrode.Research finds that alkaline purification strictly must control reaction conditions, otherwise the excessive corrosion of alloy can lose a part of useful capacity, and the surface corrosion indenture that long-time alkaline purification simultaneously causes and cavity accelerate the corrosion of alloy, reduce cycle life.
Summary of the invention
In order to improve the chemical property of RE-Mg-Ni materials base hydrogen storage alloy further, particularly cyclical stability and self-discharge performance, the present invention discloses a kind of hot alkali treatment method to hydrogen storage alloy, present method comprises the following steps: the chemistry that the present invention discloses a kind of hydrogen storage alloy performance improves, its key step comprises alloyage, the preparation of the NaOH aqueous solution, hot alkali treatment, alloy powder washs, it is characterized in that: the alloy sample selected by described alloyage is prepared burden by the Composition Design of La0.54Pr0.1Gd0.2Mg0.16Ni3.3Co0.3Al0.1, metal purity used is all more than 99.5%, by the carefully polishing of test button surface, remove oxide film and impurity, carry out melting and annealing.
The NaOH aqueous solution that massfraction is 40% ~ 45% is prepared in being formulated as of the described NaOH aqueous solution.
Described hot alkali treatment process is placed in temperature constant magnetic stirring machine by the alkaline solution prepared, and set temperature 90 ° of C, after homo(io)thermism, pour into alloy powder in alkali lye, stirring heating 45min.
Described alloy powder washing process first removes alkali lye by filtering separation, then alloy powder applies ultrasonic wave, finally utilizes the settling velocity difference whizzer in the aqueous solution to be separated the impurity of removing alloy surface.
Beneficial effect of the present invention: there is good erosion resistance, surface is not oxidizable, and alloy is efflorescence not easily;
There is the conductivity of good electricity and heat;
Stable configuration and chemical constitution, in the alkaline electrolyte stable chemical nature;
Speed for hydrogen absorbing and releasing is fast, and fast charging and discharging resistance (overpotential) is little;
Embodiment
Alloy sample is prepared burden by the Composition Design of La0.54Pr0.1Gd0.2Mg0.16Ni3.3Co0.3Al0.1, and metal purity used, all more than 99.5%, by the carefully polishing of test button surface, is removed oxide film and impurity, carried out melting and annealing.The NaOH aqueous solution that massfraction is 40% ~ 45% is prepared in being formulated as of the NaOH aqueous solution.Hot alkali treatment process is placed in temperature constant magnetic stirring machine by the alkaline solution prepared, and set temperature 90 ° of C, after homo(io)thermism, pour into alloy powder in alkali lye, stirring heating 45min.Alloy powder washing process first removes alkali lye by filtering separation, then alloy powder applies ultrasonic wave, finally utilizes the settling velocity difference whizzer in the aqueous solution to be separated the impurity of removing alloy surface.
Claims (4)
1. the present invention discloses a kind of chemistry improvement of hydrogen storage alloy performance, and its key step comprises alloyage, the preparation of the NaOH aqueous solution, hot alkali treatment, alloy powder washing, it is characterized in that: the alloy sample selected by described alloyage is by La
0.54pr
0.1gd
0.2mg
0.16ni
3.3co
0.3al
0.1composition Design prepare burden, metal purity used, all more than 99.5%, by the carefully polishing of test button surface, is removed oxide film and impurity, is carried out melting and annealing.
2. improve according to the chemistry of the hydrogen storage alloy performance described in claim 1, it is characterized in that: the NaOH aqueous solution that massfraction is 40% ~ 45% is prepared in being formulated as of the described NaOH aqueous solution.
3. improve according to the chemistry of the hydrogen storage alloy performance described in claim 1, it is characterized in that: described hot alkali treatment process is placed in temperature constant magnetic stirring machine by the alkaline solution prepared, and set temperature 90 ° of C, after homo(io)thermism, alloy powder is poured in alkali lye, stirring heating 45min.
4. improve according to the chemistry of the hydrogen storage alloy performance described in claim 1, it is characterized in that: described alloy powder washing process first removes alkali lye by filtering separation, alloy powder applies ultrasonic wave again, finally utilizes the settling velocity difference whizzer in the aqueous solution to be separated the impurity of removing alloy surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310712757.9A CN104726747A (en) | 2013-12-23 | 2013-12-23 | Chemical improvement method of performances of La-Mg-Ni serial hydrogen storage alloy |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310712757.9A CN104726747A (en) | 2013-12-23 | 2013-12-23 | Chemical improvement method of performances of La-Mg-Ni serial hydrogen storage alloy |
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| CN104726747A true CN104726747A (en) | 2015-06-24 |
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| CN201310712757.9A Pending CN104726747A (en) | 2013-12-23 | 2013-12-23 | Chemical improvement method of performances of La-Mg-Ni serial hydrogen storage alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109913700A (en) * | 2019-04-30 | 2019-06-21 | 三桥惠(佛山)新材料有限公司 | A kind of preparation method of surface micropore nickel plating hydrogen bearing alloy |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1515040A (en) * | 2001-06-11 | 2004-07-21 | 株式会社三德 | Method for fabricating negative electrode for secondary cell |
| CN101027802A (en) * | 2004-08-26 | 2007-08-29 | 株式会社杰士汤浅 | Hydrogen storage electrode and nickel hydrogen battery |
| CN101353733A (en) * | 2008-08-07 | 2009-01-28 | 上海交通大学 | Preparation of La-Mg-Ni system hydrogen occluding alloy |
| CN101589491A (en) * | 2007-07-24 | 2009-11-25 | 松下电器产业株式会社 | Negative-electrode material for nickel hydrogen battery, method of treating the same, and nickel hydrogen battery |
-
2013
- 2013-12-23 CN CN201310712757.9A patent/CN104726747A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1515040A (en) * | 2001-06-11 | 2004-07-21 | 株式会社三德 | Method for fabricating negative electrode for secondary cell |
| CN101027802A (en) * | 2004-08-26 | 2007-08-29 | 株式会社杰士汤浅 | Hydrogen storage electrode and nickel hydrogen battery |
| CN101589491A (en) * | 2007-07-24 | 2009-11-25 | 松下电器产业株式会社 | Negative-electrode material for nickel hydrogen battery, method of treating the same, and nickel hydrogen battery |
| CN101353733A (en) * | 2008-08-07 | 2009-01-28 | 上海交通大学 | Preparation of La-Mg-Ni system hydrogen occluding alloy |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109913700A (en) * | 2019-04-30 | 2019-06-21 | 三桥惠(佛山)新材料有限公司 | A kind of preparation method of surface micropore nickel plating hydrogen bearing alloy |
| CN109913700B (en) * | 2019-04-30 | 2020-10-27 | 三桥惠(佛山)新材料有限公司 | Preparation method of surface micro-porous nickel-plated hydrogen storage alloy |
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Application publication date: 20150624 |