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Over-stoichiometric low-cost hydrogen storage alloy, and preparation method and application thereof

A technology of stoichiometric ratio and hydrogen storage alloy, which is applied in the field of low-cost hydrogen storage alloy and its preparation, can solve the problems of high price, high price of hydrogen storage alloy, and affecting the competitiveness of nickel-metal hydride batteries, etc., so as to reduce the cost of the alloy Effect

Active Publication Date: 2009-11-04
XTC HYDROGEN ENERGY SCI & TECH (XIAMEN) CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, metal cobalt is a rare resource and its price is very high, resulting in the high price of hydrogen storage alloys, which affects the competitiveness of nickel-metal hydride batteries

Method used

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  • Over-stoichiometric low-cost hydrogen storage alloy, and preparation method and application thereof
  • Over-stoichiometric low-cost hydrogen storage alloy, and preparation method and application thereof
  • Over-stoichiometric low-cost hydrogen storage alloy, and preparation method and application thereof

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Embodiment Construction

[0032] The following examples are combined with Figure 1 to Figure 3 The present invention will be described.

[0033]The ingredients are prepared according to the composition shown in Table 1, placed in a crucible in a vacuum induction quenching furnace, and subjected to induction heating and smelting under the protection of evacuated and filled with argon. Perform rapid quenching on a high-speed rotating copper roller (copper roller diameter 300mm, rotational speed 150rpm) to obtain a thin slice with a thickness of about 0.2mm, heat-treat the obtained thin slice according to the process of 950°C×6h, and make a powder with a particle size of less than 150 mesh to obtain a sample 1 to 12, wherein: sample 1 is a common commercial high-cobalt hydrogen storage alloy, samples 2 and 3 are existing commercial low-cobalt hydrogen storage alloys, and samples 4 to 12 are samples prepared according to the formula provided by the present invention.

[0034] The heat treatment process o...

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Abstract

The invention discloses an over-stoichiometric hydrogen storage alloy, and a preparation method and application thereof, and belongs to the field of hydrogen storage alloys. The general expression of a formula is RENiaCobMncAldCueFef, wherein RE consists of one or more rare earth elements such as La, Ce, Pr, Nd, Y and the like; moreover, a is more than or equal to 3.55 and less than or equal to 4.45, b is more than or equal to 0 and less than or equal to 0.3, c is more than or equal to 0.6 and less than or equal to 1.2, d is more than or equal to 0 and less than or equal to 0.2, e ismore than or equal to 0 and less than or equal to 0.65, f is more than or equal to 0 and less than or equal to 0.45, and the summation of a, b, c, d, e, and f is more than or equal to 5.6 and less than or equal to 6.0. In the formula provided by the invention, the consumption of the precious metal cobalt which is indispensable to the common commercial hydrogen storage alloy is greatly reduced, and even the cobalt cannot be included in the hydrogen storage alloy, so that the aim of lowering cost is achieved. By controlling a microstructure of the alloy, the alloy can maintain better capacity and longer service life.

Description

technical field [0001] The invention relates to the field of hydrogen storage alloys, in particular to a low-cost hydrogen storage alloy applied to nickel-hydrogen batteries and its preparation method and application. Background technique [0002] Hydrogen storage alloy is a new type of functional material, which has reversible hydrogen absorption and desorption properties under certain conditions, and is a main material for the negative electrode of nickel-metal hydride batteries. [0003] Ni-MH battery is a new type of green secondary battery. Traditional nickel-cadmium batteries are toxic to the environment due to the toxicity of the heavy metal cadmium contained in them. As people's awareness of protection increases, they are increasingly restricted. Compared with nickel-cadmium batteries, nickel-metal hydride batteries have high energy density, no memory effect, good overcharge and discharge resistance, and no environmental pollution problems; at the same time, compare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38C22C19/03C22F1/10C22F1/00C22C1/02
CPCY02E60/12Y02E60/10
Inventor 蒋义淳杨金洪张永健丁祥海陈永刚陈跃辉林玉麟周燕
Owner XTC HYDROGEN ENERGY SCI & TECH (XIAMEN) CO