Hydrogen storage material, negative electrode and nickel hydrogen secondary battery

A hydrogen storage material and secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as insufficient discharge characteristics, and achieve the effect of excellent low-temperature discharge characteristics

Active Publication Date: 2021-07-23
SANTOKU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nickel-hydrogen secondary battery using the above-mentioned hydrogen-absorbing alloy for the negative electrode has a problem of insufficient discharge characteristics at low temperatures, although it has a higher capacity than the nickel-cadmium secondary battery.

Method used

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  • Hydrogen storage material, negative electrode and nickel hydrogen secondary battery
  • Hydrogen storage material, negative electrode and nickel hydrogen secondary battery
  • Hydrogen storage material, negative electrode and nickel hydrogen secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] In order to prepare hydrogen storage alloy particles having the composition shown in Table 1, first, raw materials other than Mg were weighed and melted in an argon atmosphere in a high-frequency furnace to form an alloy melt. Next, the pouring temperature of this alloy melt was set at 1400° C., and it was rapidly cooled and solidified by a strip casting method using a single-roll casting device using a copper water-cooled roll to obtain an alloy slab with an average thickness of 0.35 mm. The obtained alloy cast flakes were pulverized using a ball mill to obtain alloy powder having an average particle diameter (D50) of 75 μm. The composition of the obtained alloy powder was analyzed by ICP, and the result was La 0.14 SM 0.80 Zr 0.02 Ni 3.26 al 0.24 .

[0093] The above-mentioned alloy powder and metal Mg powder with an average particle diameter (D50) of 110 μm were thoroughly mixed with a mortar, kept at 700° C. for 30 minutes in an argon atmosphere, and then raise...

Embodiment 2～28、 comparative example 3～5 and 7～9

[0110] Except for changing the composition of the hydrogen storage material, the composition of the hydrogen storage alloy particles, the amount of Ni powder, and the heat treatment conditions as shown in Tables 1 and 2, Examples 2 to 28 were prepared in the same manner as in Example 1, and comparative Examples 3-5 and 7-9 hydrogen storage materials. However, instead of the above-mentioned Ni powder with an average particle diameter (D50) of 0.6 μm, Ni powder with D50 of 2.4 μm was used in Example 19, Ni powder with D50 of 2.0 μm was used in Example 20, and Ni powder with D50 of 2.0 μm was used in Example 21. D50 is Ni powder of 3.5 μm. Table 3 shows the results of X-ray diffraction measurement and battery characteristic evaluation test performed in the same manner as in Example 1.

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Abstract

The present invention provides a hydrogen storage material which is capable of improving the discharge characteristics of a nickel hydrogen secondary battery at low temperatures; and a negative electrode and a nickel hydrogen secondary battery, each of which uses this hydrogen storage material. This hydrogen storage material has a specific composition, while containing hydrogen storage alloy particles and a surface modification substance that adheres to the surfaces of the particles. With respect to the X-ray diffraction pattern of this hydrogen storage material, if the relative intensity of the maximum peak Pmax among the diffraction peaks in the range of 2[theta]=42.00 degrees to 44.00 degrees is taken as 100.00%, the relative intensity of the maximum peak P1 in the range of 2[theta]=30.35 degrees to 30.65 degrees is from 4.00% to 70.00% (inclusive), the relative intensity of the maximum peak P2 in the range of 2[theta]=32.85 degrees to 33.15 degrees is less than 60.00%, and the relative intensity of the maximum peak P3 in the range of 2[theta]=51.65 degrees to 51.95 degrees is less than 6.00%.

Description

technical field [0001] The invention relates to a hydrogen storage material, and also relates to a negative electrode and a nickel-hydrogen secondary battery using the hydrogen storage material. Background technique [0002] Hydrogen storage alloys are alloys capable of reversibly storing and releasing hydrogen, and have recently attracted attention as energy sources, and are expected to be used in various fields. [0003] Hydrogen storage alloys have been used in negative electrodes of nickel-metal hydride secondary batteries. A nickel-hydrogen secondary battery using a hydrogen-absorbing alloy as a negative electrode has a higher energy density than a nickel-cadmium secondary battery, and since no harmful cadmium (Cd) is used, the load on the environment is small. Such nickel-metal hydride secondary batteries are used in portable electronic devices, electric tools, electric vehicles, hybrid vehicles, and the like, and various battery characteristics are required depending...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/00B22F1/00B22F1/02H01M4/38B22F1/16
CPCC22C19/00Y02E60/10C22C2202/04C22C1/0433C22C1/0441B22F2998/10H01M4/383H01M4/385H01M10/345B22F1/16B22F1/00B22F9/08B22F2009/043B22F1/142B22F2201/11B22F1/09B22F9/04
Inventor 大月孝之
Owner SANTOKU CORP
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