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AB3-type hydrogen-storing alloy of nickel-metal hydride battery and preparation method thereof

A technology for hydrogen storage alloys and nickel-metal hydride batteries, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of general performance, high alloy price, poor electrochemical cycle stability, etc., and achieve wide working temperature range and high discharge platform , Excellent cost-effective effect

Active Publication Date: 2014-03-26
HUNAN GREPOOW NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

AB 5 The intrinsic hydrogen storage capacity of the type alloy is less than 1.4% (mass fraction), and the current commodity AB 5 The discharge capacity of the alloy can only reach 350mAh / g, which is close to its theoretical limit and cannot meet the needs of high-capacity Ni-MH batteries.
Another AB 5 The price of the alloy is high and the performance is average, which can no longer meet the market demand
AB 2 The hydrogen storage capacity of the type alloy is 1.8%-2.4% (mass fraction), and the electrochemical capacity can reach more than 420mAh / g, but there are problems such as poor electrochemical cycle stability and difficult initial activation.

Method used

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  • AB3-type hydrogen-storing alloy of nickel-metal hydride battery and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0012] Making the Invention AB 3 Alloy 20Kg, its stoichiometric formula is MmNi 2.86 sn 0.03 Zr 0.02 Si 0.06 B 0.03 mn 0.21 1Al 0.16 , The weight percent content of side A elements is La25%, Ce 4%, Mg 3.5%. First, weigh La, Ce, Sn, Zr, Si, B, Mn, Al, part of Ni and MgNi alloys in proportion, and use a vacuum high-frequency induction furnace for the first feeding: La, Ce, Sn, Zr, Si , B, Mn, Al and part of Ni, after the feeding is completed, adjust the heating power to 100KW, and then increase the power to 20KW per minute. When the temperature reaches 1410°C, stop heating and stay at this temperature for 30min. The second feeding: add MgNi alloy, after the feeding is completed, stay for 6min. Start casting. After casting, cool the alloy ingot by circulating water, and then anneal. The annealing temperature is 910°C, and the annealing time is 8 hours. 3 Alloy 20Kg.

[0013] Use the obtained alloy to make 50 90M18Ah batteries.

Embodiment 2

[0015] Making the Invention AB 3 Alloy 20Kg, its stoichiometric formula is MmNi 2.86 sn 0.03 Zr 0.02 Si 0.06 B 0.03 mn 0.21 1Al 0.16 , The weight percent content of side A elements is La26%, Ce 3%, Mg 3.5%. First, weigh La, Ce, Sn, Zr, Si, B, Mn, Al, part of Ni and MgNi alloys in proportion, and use a vacuum high-frequency induction furnace for the first feeding: La, Ce, Sn, Zr, Si , B, Mn, Al and part of Ni, after the feeding is completed, adjust the heating power to 100KW, and then increase the power to 20KW per minute. When the temperature reaches 1410°C, stop heating and stay at this temperature for 30min. The second feeding: add MgNi alloy, after the feeding is completed, stay for 6min. Start casting. After casting, cool the alloy ingot by circulating water, and then anneal. The annealing temperature is 910°C, and the annealing time is 8 hours. 3 Alloy 20Kg.

[0016] Use the obtained alloy to make 50 90M18Ah batteries.

Embodiment 3

[0018] Making the Invention AB 3 Alloy 20Kg, its stoichiometric formula is MmNi 2.86 sn 0.03 Zr 0.02 Si 0.06 B 0.03 mn 0.21 1Al 0.16 , The weight percent content of side A elements is La24%, Ce 5%, Mg 3.5%. First, weigh La, Ce, Sn, Zr, Si, B, Mn, Al, part of Ni and MgNi alloys in proportion, and use a vacuum high-frequency induction furnace for the first feeding: La, Ce, Sn, Zr, Si , B, Mn, Al and part of Ni, after the feeding is completed, adjust the heating power to 100KW, and then increase the power to 20KW per minute. When the temperature reaches 1410°C, stop heating and stay at this temperature for 30min. The second feeding: add MgNi alloy, after the feeding is completed, stay for 6min. Start casting. After casting, cool the alloy ingot by circulating water, and then anneal. The annealing temperature is 910°C, and the annealing time is 8 hours. 3 Alloy 20Kg. Use the obtained alloy to make 50 90M18Ah batteries.

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Abstract

The invention provides AB3-type hydrogen-storing alloy of a nickel-metal hydride battery and a preparation method of the alloy. The stoichiometric equation of the AB3-type hydrogen-storing alloy is Mm Ni[2.86+ / -0.15]Sn[0.03+ / -0.01]Zr[0.02+ / -0.01]Si[0.06+ / -0.01]B[0.03+ / -0.01]Mn[0.21+ / -0.05]Al[0.16+ / -0.05], wherein Mm is an A-side element containing La, Ce and Mg, and a B-side element is Zr, Si, B, Sn, Mn, Ni and Al. The preparation method comprises the steps of weighing the La, Ce, Sn, Zr, Si, B, Mn, Al and partial Ni and MgNi alloy according to the ratio, adding the components into a vacuum high-frequency induction furnace, adjusting the heating power to 100Kw, increasing the power by 20Kw per minute, stopping the heating when the temperature reaches 1400 to 1430 DEG C, and maintaining the temperature for 25min to 40min; adding the MgNi alloy, and maintaining for 4min to 8min after the feeding is finished; finally, casting, annealing, crushing, ball-milling, screening and packaging to complete the production of the AB3 alloy. The AB3 hydrogen-storing alloy of the nickel-metal hydride battery has the characteristics of high capacity, long service life, wide working temperature range, high discharging platform, excellent cost performance and the like.

Description

technical field [0001] The invention relates to negative electrode materials for nickel-hydrogen batteries, in particular to a hydrogen storage alloy for nickel-hydrogen batteries and a preparation method thereof. Background technique [0002] At present, the relatively mature negative hydrogen storage materials for nickel-metal hydride batteries mainly include LaNi 5 (CaC u5 structure) that is AB 5 Type and AB 2 type (MgCu s or MgZn 2 structure). AB 5 The intrinsic hydrogen storage capacity of the type alloy is less than 1.4% (mass fraction), and the current commodity AB 5 The discharge capacity of the alloy can only reach 350mAh / g, which is close to its theoretical limit and cannot meet the needs of high-capacity Ni-MH batteries. Another AB 5 Alloys are expensive and have mediocre performance, which can no longer meet market demand. AB 2 The hydrogen storage capacity of the type alloy is 1.8%-2.4% (mass fraction), and the electrochemical capacity can reach more ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38C22C19/03C22C1/02
CPCC22C1/023C22C19/03H01M4/383Y02E60/10
Inventor 刘淼刘建忠胡彦庆
Owner HUNAN GREPOOW NEW ENERGY CO LTD
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