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Hydrogen storage alloy for low temperature Ni-MH power cell

A technology for power batteries and hydrogen storage alloys, which is applied to nickel storage batteries, battery electrodes, alkaline storage batteries, etc., and can solve problems such as the high-current discharge performance of hydrogen storage alloys that are not mentioned

Inactive Publication Date: 2008-12-10
GUANGDONG INST OF RARE METALS
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Problems solved by technology

Chinese patents 200410040649.2 and 200510123747.7 both disclose a neodymium-free rare earth hydrogen storage alloy La 1-x-y Ce x PR y (NiCoMnAl) 5 , but did not mention the high current discharge performance of hydrogen storage alloys

Method used

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  • Hydrogen storage alloy for low temperature Ni-MH power cell
  • Hydrogen storage alloy for low temperature Ni-MH power cell
  • Hydrogen storage alloy for low temperature Ni-MH power cell

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Embodiment Construction

[0010] According to the ratio of alloy composition, the rare earth element is in the form of cerium-rich rare earth alloy, the element B is added in the form of nickel-boron alloy, and the purity of other metals is above 99.5%. The prepared raw materials are vacuumed to 0.05Pa in a vacuum quenching furnace , then pass argon gas to protect the pressure of 0.05MPa, melt and shake it into hydrogen storage alloy flakes of 0.05-0.1mm, heat treat the alloy flakes at 900°C for 4 hours, and after cooling, grind them into powder by mechanical ball milling and sieve to obtain a particle size smaller than 0.075mm hydrogen storage alloy powder.

[0011] According to the above-mentioned preparation process of the hydrogen storage alloy powder, examples 1-6 of the hydrogen storage alloy powder with the composition shown in Table 1 were obtained, and the comparative example used commercially available hydrogen storage alloy powder for nickel-hydrogen batteries.

[0012] Table 1 Composition o...

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Abstract

A hydrogen-storing alloy for low temperature nickel-hydrogen power battery is disclosed, having the constituent atom rates as below: La1-x-y-zCexPryNdzNuaCobMncAldBe, wherein x=0.45-0.60, y=0.05-0.07, z=0.15-0.21, a=3.50-3.80, b=0.40-0.65, c=0.25-0.45, d=0.10-0.35, and e=0.05-0.15. The hydrogen-storing alloy can generate the second phase of CeCo4 B-type with high catalysis activeness so as to improve high-current discharge performance and low temperature discharge performance of the hydrogen-storing alloy, therefore the invention can not only be used for the low temperature nickel-hydrogen battery used on condition of -40 DEG C, but still possess excellent high-current discharge performance on condition of -2 DEG C.

Description

technical field [0001] The invention relates to a hydrogen storage alloy for batteries, in particular to a hydrogen storage alloy for low-temperature batteries. Background technique [0002] Ni-MH batteries have been widely used due to their high specific energy, fast charging and discharging, no pollution and long cycle life. Considering the reliability and safety of secondary batteries, battery material resources and environmental issues, and the development trend of secondary battery performance, nickel-hydrogen batteries are the preferred power batteries for hybrid electric vehicles in the near and mid-term. In addition, NiMH batteries are considered an optional power source for many new portable military electronic devices. However, these new application fields put forward higher requirements on the high-current discharge performance and service temperature range of the battery. In cold regions and military applications, Ni-MH batteries are required to be discharged a...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M10/30C22C19/03
CPCY02E60/10
Inventor 唐仁衡王英肖方明卢其云彭能
Owner GUANGDONG INST OF RARE METALS
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