Magnesium-based complex phase hydrogen storage material and preparation thereof

Abstract

The invention provides high-volume mg-based multiphase hydrogen storage material and a preparation method thereof. A fusion casting and ball milling method is adopted, which comprises the specific steps: (1) under vacuum or argon protection, Mg-Li-Al alloy ingot is melted and cast in an induction furnace; (2) the ingot is milled into fines with a milling machine and is thinning ground in a ball milling machine for 2-20 hours; (3) reaction milling is carried out under hydrogen atmosphere; the hydrogen pressure is 0.1-1 MPa; hydrogen is filled in a ball milling tank to the initial value of the hydrogen pressure at short intervals during the ball milling process; and the way of compulsory cooling is adopted to control the working temperature in the ball milling tank less than 50-60 DEG C; then the mg-based multiphase hydrogen storage material is prepared after argon packaging. The preparation process of the method and modification of the material are accomplished simultaneously. The initial hydrogen desorption peak temperature of the prepared hydrogen storage material is only 62 DEG C and the hydrogen storage amount is as high as 10.6wt percent. The hydrogen storage material is black nano-powder and has large hydrogen storage amount, low temperature and rapid speed for hydrogen desorption. The material can be used for hydrogen fuel vehicles, rechargeable batteries and fuel cells, etc. The method has moderate preparation condition, simple device and convenient operation.

Description

technical field [0001] The invention relates to a modified coordination magnesium-based hydride composite material and a preparation method thereof, belonging to the field of hydrogen storage materials. Background technique [0002] At present, human beings are facing multiple pressures such as resource scarcity and environmental pollution. The research and development of clean energy is one of the key ways to solve or alleviate the above problems. Hydrogen energy is recognized as clean energy. As one of the alternative energy sources that may replace traditional energy sources, hydrogen energy has shown great advantages in terms of reversibility, storage and environmental friendliness. The utilization of hydrogen energy depends on the development and application of hydrogen storage materials with superior performance and high safety. Metal hydrogen storage materials have been paid attention to as one of the ways of hydrogen supply. The US Department of Energy's 2010 hydr...

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Problems solved by technology

[0003] The present invention aims at preparing magnesium-based coordination hydride Mg(AlH 4 ) 2 The disadvantages of the method, and the magnesium-based hydride MgH 2 To solve the problem of unsatisfactory thermodynamic and kinetic properties of hydrogen absorption and desorption, provide a new type of high-capacity magnesium-based composite hydrogen storage material, and propose a synthesis method for preparing magnesium-based composite hydrogen storage material by "melting casting-ball milling hydrogenation reaction synthesis"

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