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A low-cost ab5-type hydrogen storage alloy with ultra-high capacity characteristics, its preparation method and application

A low-cost technology for hydrogen storage alloys, applied in the field of hydrogen storage alloys, can solve problems such as the reduction of electrochemical capacity, and achieve the effects of balanced utilization and cost reduction

Active Publication Date: 2015-07-29
XTC HYDROGEN ENERGY SCI & TECH (XIAMEN) CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional hydrogen storage alloy MmNi 3.75 co 0.6 mn 0.36 al 0.27 The electrochemical capacity is lower than 325 mAh / g. After replacing Co with Cr, Cu, Fe, Zn and other elements, although the cost is reduced, the electrochemical capacity is reduced to below 315 mAh / g

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The preparation method of the alloy is as follows:

[0027] According to the weight percentage of the alloy composition, Mg is added in the form of NiMg master alloy through secondary feeding, and the prepared raw materials (except NiMg master alloy) are placed in a vacuum induction quenching furnace, and then filled with argon for protection after vacuuming , then carry out induction heating melting, the melting temperature is 1300 ~ 1600 ° C, and then add the NiMg master alloy to the crucible through secondary feeding, keep it warm for 1 ~ 5 minutes, and then cast it on a high-speed rotating copper roller with internal cooling water. Cool to obtain alloy flakes with a thickness of 0.1-0.3mm, or cast in a block mold with internal and external cooling water to obtain block alloys with a thickness of 10-100mm. The obtained alloy is kept at 850° C. to 1100° C. for 3 to 20 hours, and after cooling, it is made into alloy powder with a particle size of less than 140 mesh.

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Embodiment 1

[0030] The design composition is La 0.7 Ce 0.285 Mg 0.015 Ni 3.70 co 0.72 mn 0.36 al 0.17 , according to the weight percentage of the composition shown, the prepared raw materials are placed in a vacuum induction quenching furnace, vacuumized and then filled with argon for protection, and then induction heating is carried out at a melting temperature of 1300-1600 ° C, and then passed through Add NiMg master alloy to the crucible for secondary feeding, keep it warm for 1 to 5 minutes, and then cast it to obtain the as-cast alloy. Keep the as-cast alloy at 960°C for 10 hours, and after cooling, make an alloy powder with a particle size of less than 140 mesh.

Embodiment 2

[0032] The design composition is La 0.7 Ce 0.285 Mg 0.015 Ni 3.75 co 0.72 mn 0.36 al 0.17 , except that the design components are different from embodiment 1, other are the same as embodiment 1.

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Abstract

The invention discloses a low-cost AB5 type hydrogen storage alloy having an ultrahigh capacity characteristic. The hydrogen storage alloy has a formula of LaaCe1-a-bMgbNicCodMneAlf, wherein a, b, c, d, e and f represent mol ratios; and the numerical ranges are as follows: 0.65<=a<=0.78, 0<=b<=0.04, 3.6<=c<=3.8, 0.65<=d<=0.78, 0.35<=e<=0.45, 0.15<=f<=0.2, and 4.9<=c+d+e+f<=5.15. The invention also discloses a preparation method of the hydrogen storage alloy and application of the hydrogen storage alloy in a nickel-hydrogen battery. According to the invention, the cost of the hydrogen storage alloy can be lowered, the hydrogen storage alloy having an ultrahigh capacity (>=355 mAh / g) higher than the capacity of the traditional AB5 type hydrogen storage alloy can be obtained, and the balanced utilization of rare earth resources can be realized.

Description

technical field [0001] The invention relates to a hydrogen storage alloy, in particular to a low-cost AB5 type hydrogen storage alloy with ultra-high capacity characteristics, and is related to the preparation method of the hydrogen storage alloy, and also relates to a nickel-hydrogen secondary battery using the hydrogen storage alloy. Background technique [0002] Ni-MH secondary batteries are green batteries with high specific energy and reasonable cost performance. Compared with lead-acid and nickel-cadmium batteries, they have advantages in performance and environmental protection. Compared with lithium-ion batteries, they have advantages in price, high-current charging and discharging performance and safety. It has strong applicability in various portable electronic products, electric tools, electric bicycles and other fields. Hydrogen storage alloys are the key materials that determine the performance of nickel-metal hydride secondary batteries. [0003] The theoretic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C01B3/00H01M4/38
CPCY02E60/327Y02E60/10Y02E60/32
Inventor 张鹏杨金洪钱文连姜龙林振
Owner XTC HYDROGEN ENERGY SCI & TECH (XIAMEN) CO