Hydrogen storage alloys, hydrogen storage alloy electrode and nickel metal hydride battery using the alloys

A hydrogen storage alloy and secondary battery technology, applied in secondary batteries, nickel storage batteries, battery electrodes, etc., can solve the problems of hydrogen balance pressure increase, hydrogen storage capacity decrease, battery internal pressure easy to rise, etc., and achieve hydrogen balance pressure low , Excellent cycle life, good alkali resistance effect

Active Publication Date: 2009-05-06
SANYO ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in the rare earth-Mg-Ni hydrogen storage alloys disclosed in Patent Documents 1 and 2, the hydrogen storage capacity decreases and the hydrogen equilibrium pressure increases, so the internal pressure of the battery tends to increase.

Method used

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  • Hydrogen storage alloys, hydrogen storage alloy electrode and nickel metal hydride battery using the alloys
  • Hydrogen storage alloys, hydrogen storage alloy electrode and nickel metal hydride battery using the alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Preparation of negative electrode

[0054] Raw materials of rare earth components were prepared. The details of the rare earth components were 40% La, 52% Sm, and 8% Zr in atomic ratio. Then, using an induction melting furnace, prepared the atomic ratio A block of a hydrogen storage alloy containing raw materials of rare earth components, Mg, Ni, and Al in a ratio of 0.85:0.15:3.5:0.1. The alloy was heat-treated at 1000°C for 10 hours in an argon atmosphere to obtain a composition of (La 0.40 SM 0.52 A 0.08 ) 0.85 Mg 0.15 Ni 3.5 Al 0.1 An ingot of a rare earth-Mg-Ni hydrogen storage alloy represented by a superlattice structure.

[0055] The ingot of the rare earth-Mg-Ni hydrogen storage alloy was mechanically pulverized in an inert gas atmosphere, and alloy particles having a particle size in the range of 400 to 200 mesh were selected and classified by sieving. When the particle size distribution of the alloy particles was measured using a laser diffraction...

Embodiment 2

[0064] Assemble the nickel-hydrogen secondary battery, except that the composition of the hydrogen storage alloy is (La 0.46 SM 0.46 Zr 0.08 ) 0.85 Mg 0.15 Ni 3.5 Al 0.1 Other than that, the others are the same as in Example 1.

Embodiment 3

[0066] Assemble the nickel-hydrogen secondary battery, except that the composition of the hydrogen storage alloy is (La 0.48 SM 0.44 Zr 0.08 ) 0.85 Mg 0.15 Ni 3.5 Al 0.1 Other than that, the others are the same as in Example 1.

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Abstract

A nickel metal hydride battery includes particles of hydrogen storage alloys in the negative electrode. Such hydrogen storage alloys have a composition expressed by a general formula: (LaaSmbAc)1-wMgwNixAlyTz. In the formula, A and T denote at least one element selected from the groups consisting of: Pr, Nd, and the like; and V, Nb, and the like, respectively, the subscripts a, b, and c satisfy the relationship given by: a>0; b>0; 0.1>c>=0; and a+b+c=1, and the subscripts w, x, y, and z fall within the range given by: 0.1<w<=1; 0.05<=y<=0.35; 0<=z<=0.5; and 3.2<=x+y+z<=3.8.

Description

technical field [0001] The invention relates to a hydrogen storage alloy, a hydrogen storage alloy electrode using the alloy, and a nickel-hydrogen secondary battery. Background technique [0002] In order to achieve higher performance of nickel-hydrogen secondary batteries, it has been proposed to use rare earth-Mg-Ni-based hydrogen storage alloys as negative electrode active materials. Rare-earth-Mg-Ni-based hydrogen storage alloys have a larger hydrogen storage capacity than conventionally used rare-earth-Ni-based hydrogen storage alloys, and are suitable for increasing the capacity of nickel-hydrogen secondary batteries. [0003] On the other hand, rare-earth-Mg-Ni-based hydrogen storage alloys have low alkali resistance, and a nickel-hydrogen secondary battery using this alloy suffers from a problem of reduced cycle life. In response to this problem, various studies have been made on the components of rare earths and proposals have been made. Among them are proposals t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/02H01M4/24H01M10/30C22C19/00
CPCY02E60/124H01M4/242H01M10/345Y02E60/10
Inventor 木原胜远藤贤大佐口明
Owner SANYO ELECTRIC CO LTD
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