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Hydrogen storage alloy, negative electrode containing hydrogen storage alloy, and nickel-hydrogen secondary battery containing negative electrode

A hydrogen storage alloy, secondary battery technology, applied in secondary batteries, nickel storage batteries, negative electrodes, etc., can solve problems such as the reduction of cycle life characteristics, achieve low temperature discharge characteristics and cycle life characteristics improvement, and realize low temperature discharge characteristics. Effect

Pending Publication Date: 2022-03-18
FDK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] If the activity of the surface of the hydrogen storage alloy is increased in order to improve the low-temperature discharge characteristics as described above, the low-temperature discharge characteristics can be improved, but there is a problem that the cycle life characteristics are reduced.

Method used

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  • Hydrogen storage alloy, negative electrode containing hydrogen storage alloy, and nickel-hydrogen secondary battery containing negative electrode
  • Hydrogen storage alloy, negative electrode containing hydrogen storage alloy, and nickel-hydrogen secondary battery containing negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Production of hydrogen storage alloy and negative electrode

[0051] First, La, Mg, Ni, and Al were weighed and mixed to obtain a mixture having a molar ratio of 0.763:0.237:3.30:0.10. The resulting mixture was melted in an induction melting furnace, and the melt was poured into a mold, and then cooled to room temperature (25° C.) to obtain an ingot of a hydrogen storage alloy. The composition of the sample collected from this ingot was analyzed by high-frequency inductively coupled plasma spectrometry (ICP). As a result, the composition of the hydrogen storage alloy is La 0.763 Mg 0.237 Ni 3.30 al 0.10 .

[0052] Next, the obtained ingot was filled in a container, and the inside of the container was replaced with argon gas, and then the container was sealed. This container was put into a heat treatment furnace, and it held at the temperature of 1000 degreeC for 10 hours, and the ingot was heat-processed under an argon atmosphere. Then, after the heat treatme...

Embodiment 2～3、 comparative example 1～2

[0067] A nickel-hydrogen secondary battery was obtained in the same manner as in Example 1, except that the heat treatment temperature of the hydrogen storage alloy was changed so that the strength ratio A and the strength ratio B reached the values ​​shown in Table 1.

[0068] 2. Evaluation of Ni-MH secondary battery

[0069] (1) Low temperature discharge characteristics

[0070] For the batteries prepared in Examples 1-3 and Comparative Examples 1-2, a charging current of 2.3A was flowed in an environment of 25°C. After the battery voltage reached the maximum value, the battery was charged so that the voltage dropped to 10mV, and then rested for 1 hour. . Then, the battery after resting for 1 hour was discharged at a discharge current of 2.3 A in an environment of 25° C. until the battery voltage reached 1.0 V. At this time, the discharge capacity was measured, and this discharge capacity was regarded as the initial capacity of the battery.

[0071] For the batteries of E...

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Abstract

A nickel-hydrogen secondary battery (2) is provided with an outer can (10) and an electrode group (22) housed in the outer can (10) together with an alkaline electrolyte, the electrode group (22) includes a positive electrode (24) and a negative electrode (26) that overlap each other with a separator (28) interposed therebetween, and the negative electrode (26) includes a hydrogen storage alloy for nickel-hydrogen secondary batteries having a single composition and comprising a plurality of crystal phases.

Description

technical field [0001] The invention relates to a hydrogen storage alloy, a negative electrode containing the hydrogen storage alloy and a nickel-hydrogen secondary battery containing the negative electrode. Background technique [0002] A nickel-metal hydride secondary battery is known as a type of alkaline secondary battery. The nickel-hydrogen secondary battery has a higher capacity than a nickel-cadmium secondary battery and has excellent environmental safety. From these points, it is used in various portable devices and various devices such as hybrid electric vehicles, and its applications are expanding. In this way, since applications are expanding, higher performance of nickel-metal hydride secondary batteries is expected. [0003] Low-temperature discharge characteristics may be mentioned as one of performances required to be enhanced in nickel-hydrogen secondary batteries. Here, the low-temperature discharge characteristics refer to the extent to which the battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/24H01M10/28H01M10/30B22F9/04C22C19/03C22F1/02C22F1/10C30B29/52
CPCH01M4/383H01M10/30H01M10/28H01M4/242C22C19/03C22F1/10C30B29/52C22F1/02B22F9/04C22C19/007H01M10/345H01M10/286Y02E60/10Y02P70/50C22C2202/04H01M4/134H01M10/054H01M2004/027
Inventor 大畠升太石田润江原友树木原胜
Owner FDK CORP
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