Composite hydrogen storage material containing LiNH2 and Mg and preparation method thereof

Abstract

The invention belongs to the field of preparation of hydrogen storage materials, and particularly relates to a composite hydrogen storage material containing LiNH2 and Mg as well as a preparation method and application of the composite hydrogen storage material. The method comprises the following steps: a, uniformly mixing LiNH2 powder and Mg powder according to a molar ratio of 1: 1, and putting the mixture into a ball milling tank; b, a mechanical alloying method is adopted, a mechanical ball milling method is adopted, ball milling is conducted on a ball mill, the weight ratio of grinding balls to the mixed raw materials is 29: 1, the ball milling time is 6 h, the ball milling rotating speed is 400 rpm, and the composite hydrogen storage material containing LiNH2 and Mg is obtained. The compound obtained by the method is granular, and the particle size is 1t; and the hydrogen desorption capacity is 3.98-4.2 wt% when the particle size is 1 micron. The raw materials are easy to obtain, the preparation process is simple, and operation is convenient. A surfactant, a catalyst and the like do not need to be added in the reaction, and high-purity hydrogen is easily obtained.

Description

technical field [0001] The invention belongs to the field of preparation of hydrogen storage materials, in particular to a high-capacity LiNH-containing 2 The preparation method of the composite hydrogen storage material of Mg and Mg. Background technique [0002] With the energy crisis and environmental deterioration, hydrogen energy is considered to be an ideal clean energy in the future. Hydrogen storage materials related to hydrogen energy technology have also attracted widespread attention at home and abroad. The goal of the development of hydrogen storage materials is to explore a new generation of hydrogen storage materials with high hydrogen storage capacity and good comprehensive performance. Metal-N-H hydrogen storage materials are new high-capacity hydrogen storage materials developed in recent years. They have better reversible hydrogen absorption and desorption properties and more suitable hydrogen absorption and desorption thermodynamic properties. They are a...

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Problems solved by technology

In the above existing studies, using Mg to partially replace LiNH 2 The Li atoms in the crystal can effectively reduce the energy required for H dissociation, thereby improving the LiNH 2 However, introducing an atomic substitution structure into the crystal requires a lot of energy and extremely harsh conditions. It is difficult to control the substitution position of the crystal and the relative content of the substitution element in the experimental state, which is not conducive to actual production and application.

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