Low temperature power type hydrogen storage alloy for nickel-metal hydride battery

A technology for hydrogen storage alloys and nickel-metal hydride batteries, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of decreased self-discharge performance of alloys, aggravated corrosion of nickel-metal hydride batteries, and easy volatilization, and achieves low temperature and improved power performance. Effect

Active Publication Date: 2012-08-22
XTC HYDROGEN ENERGY SCI & TECH (XIAMEN) CO
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Problems solved by technology

However, the B element is volatile and has great difficulties in industrial application. Although the formation of the second phase is beneficial to the high current of the alloy, it may aggravate the corrosion of the nickel-metal hydride battery during storage and use, resulting in the deterioration of the alloy. Self-discharge performance is reduced

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  • Low temperature power type hydrogen storage alloy for nickel-metal hydride battery
  • Low temperature power type hydrogen storage alloy for nickel-metal hydride battery
  • Low temperature power type hydrogen storage alloy for nickel-metal hydride battery

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Embodiment Construction

[0020] The embodiments of the present invention will be described in detail below, but the present invention is not limited thereto, and the present invention can also be implemented by making appropriate adjustments within the scope of not changing the claims of the present invention.

[0021] "%" in the examples are all "wt%".

[0022] 1) Alloy preparation method:

[0023] Preparation of La (purity >99.5%), Mm (La: 30%, Ce: 50%, Pr: 5%, Nd: 15%; La+Ce+Pr+Nd >99%), Ni (purity >99.5%) , Co (purity>99.5%), Mn (purity>99.5%), Al (purity>99.5%) total 5kg. Put the raw metal into Al in the order of Al, Mn, Ni, Co, La, Mm from bottom to top 2 o 3 in the crucible. First evacuate to 3Pa, then bake and wash the furnace, fill with argon to 0.05MPa, gradually adjust the power of 4kw, 6kw, 8kw, 10kw for 5 minutes each, control the temperature at 1500℃±30℃, and then refine for 3 minutes; Argon to 0.05MPa, the melt is poured and passed through a water-cooled copper roller (line speed i...

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Abstract

The invention discloses a low temperature power type hydrogen storage alloy for a nickel-metal hydride battery. An alloy general formula is MlNiaCobMncAld, wherein a, b, c and d show molar ratio, the number range is 3.9<=a<=4.8, 0.3<=b<=0.6, 0<=c<=0.1, 0.1<=d<=0.4, 5.0<=a+b+c+d<=5.3. The Ml is composed of La and one of elements of Ce, Pr, Nd, Sm, Gd, Dy, Y and Zr, the La content is 40-80wt% of the Ml, and corresponding La is 10-26wt% of the content of the alloy. The alloy has excellent low temperature performance and high discharge voltage, simultaneously Mn content in the alloy composition is low, and the low temperature power type hydrogen storage alloy has excellent self discharge performance.

Description

technical field [0001] The invention relates to a hydrogen storage alloy for a low-temperature dynamic nickel-hydrogen battery. Background technique [0002] In recent years, due to the development of portable electronic devices and the revolution of transportation power energy, the research and development of high-energy batteries has become the focus of development in various countries. Among them, nickel-metal hydride batteries for civil or hybrid vehicles have attracted much attention and have been commercialized; In addition, NiMH batteries are also widely used as an optional power source for many portable military electronic devices. However, this application field puts forward higher requirements on the power performance and service temperature range of Ni-MH batteries. In cold regions and military applications, the battery is required to be discharged at -40°C. At present, when the temperature of ordinary Ni-MH batteries is lower than -20°C, the discharge performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03H01M4/38
CPCY02E60/10
Inventor 林建雄杨金洪钱文连张永健蒋义淳张鹏陈跃辉
Owner XTC HYDROGEN ENERGY SCI & TECH (XIAMEN) CO
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