High-speed iron hydrogen storage electrode alloy and nickel-hydrogen battery anode material

A technology for electrode alloys and nickel-metal hydride batteries, applied in battery electrodes, alkaline battery electrodes, circuits, etc., can solve problems such as poor comprehensive performance, achieve the effects of improving efficiency, reducing production costs, and improving market competitiveness

Active Publication Date: 2015-12-09
宝生集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Document 4 discloses that Mm prepared by rapid solidification method 1-z Dy z Ni 3.55 co 0.75-x-y Fe x Cu y mn 0.4 Al 0.3 Low-cobalt alloys, but the overall performance is still poor when the Fe content is high. This patent does not get rid of high-priced elements such as Co, La, and Ce, which is different from this patent.

Method used

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  • High-speed iron hydrogen storage electrode alloy and nickel-hydrogen battery anode material
  • High-speed iron hydrogen storage electrode alloy and nickel-hydrogen battery anode material
  • High-speed iron hydrogen storage electrode alloy and nickel-hydrogen battery anode material

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preparation example Construction

[0037] The preparation method of the present invention is:

[0038] According to the molecular formula of the present invention La x Ce y m 1 z Ni a Fe b mn c Al d m 2 e The elements of the raw materials are smelted under the protection of inert gas. When the Fe content is high, it can be prepared by single-roll quick quenching method. After annealing or not, it is powdered. The alloy powder passed through a 200-mesh sieve is used to prepare electrodes. Mix hydrogen storage alloy powder and additive Cu powder at a ratio of 1:3, and cold press at a pressure of about 65MPa The thin discs were used as research electrodes.

[0039] The electrochemical performance testing equipment is a computer-controlled DC-5 battery tester. Activation of the half-cell was performed with a 60mAg -1 Charging for 7 hours, 60mAg -1 Discharge to cut-off potential -0.6V (relative to Hg / HgO reference electrode), cycle 7-10 times. The maximum discharge capacity of the metal hydride electr...

Embodiment 1

[0041] Table 1 Composition, discharge capacity and capacity retention of alloys with different stoichiometric ratios

[0042]

[0043] figure 1 It is the X-ray diffraction spectrum of alloys with different stoichiometric ratios shown in Table 1. It can be seen that under-stoichiometric alloys have a multi-phase structure without annealing, and single-phase structures are easily obtained for over-stoichiometric alloys. At the same time, it can be seen from Table 1 that the discharge capacity and cycle stability of the over-stoichiometric alloy are good, but the selection of the under-stoichiometric alloy is beneficial to further reduce the cost of raw materials. figure 2 is the maximum discharge capacity curve of the five recommended components shown in Table 1, and the maximum discharge capacity of the alloy can reach 315.6mAh / g under the stoichiometric ratio condition.

Embodiment 2

[0045] Table 2 shows the composition, maximum discharge capacity and capacity retention rate of 20 as-cast cobalt-free high-iron LaCe-Ni hydrogen storage electrode alloys. All alloys are made from LaNi 5 Phase single-phase composition. figure 2 is the maximum discharge capacity curve of the five recommended components shown in Table 2, image 3 is the charge-discharge cycle curve of the five recommended components. The maximum capacity of this series of alloys can reach 330mAh / g, and the capacity retention rate can reach more than 90%. It shows that this series of alloys has strong application value.

[0046] Table 2 Composition, discharge capacity and capacity retention of the alloy

[0047] serial number alloy composition 0.2C maximum discharge capacity 150 times capacity protection

[0048]

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PUM

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Abstract

The invention discloses a high iron hydrogen storage electrode alloy and a preparation method thereof, and relates to an electronic material technology. A general formula of the alloy is LaxCeyM <1> zNiaFebMncAldM <2> e, wherein x, y, z, a, b, c, d and e represent mol ratios; x is equal or greater than 0.3 and is equal or lesser than 0.9; y is equal or greater than 0.1 and is equal or lesser than 0.7; z is equal or greater than 0 and is equal or lesser than 0.2; the sum of x, y and z is 1; a is equal or greater than 0 and is equal or lesser than 4.5; b is equal or greater than 0.2 and is equal or lesser than 1.6; c is equal or greater than 0 and is equal or lesser than 0.6; d is equal or greater than 0 and is equal or lesser than 0.5; e is equal or greater than 0 and is equal or lesser than 0.2; and the sum of a, b, c, d and e is equal or greater than 4.5 and is equal or lesser than 5.5. In the general formula, La, Ce and M <1> are A side elements, wherein M <1> is an A side substitutable element and z is equal or greater than 0 and is equal or lesser than 0.2; and Ni, Fe, Mn, Al and M <2> are B side elements, wherein M <2> is an B side substitutable element and e is equal or greater than 0 and is equal or lesser than 0.2. Through the preparation method, a production cost of a hydrogen storage electrode alloy is reduced observably; a production cost of hydrogen storage alloy raw materials is reduced observably on the premise that combination properties are guaranteed; and a market competitiveness of hydrogen storage alloy products and nickel-hydrogen battery products is improved.

Description

technical field [0001] The present invention relates to electronic material technology, in more detail, it is a low-cost cobalt-free high-iron LaCe-Ni system AB used for the negative electrode of nickel-hydrogen battery 5 Type hydrogen storage alloy and its preparation process. Background technique [0002] AB 5 The type rare earth nickel hydrogen storage alloy is the most widely used negative electrode material in the production of MH / Ni batteries due to its excellent cost performance. After years of research and development and production practice, AB 5 The comprehensive electrochemical performance of the hydrogen storage alloy has reached a certain height, so one of the more realistic ways to expand the application field of MH / Ni battery and improve its competitiveness in the secondary battery industry is to reduce the production cost of the hydrogen storage alloy. At present, the prices of Co and Ni, the raw material metals required for hydrogen storage alloys, remain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03C22F1/10H01M4/38H01M4/26
CPCY02E60/124Y02E60/10
Inventor 陈云贵羊恒吴朝玲晁栋梁
Owner 宝生集团有限公司
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