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Li-n-h system hydrogen storage material and preparation method thereof

A hydrogen storage material and system technology, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the problems that affect the practical process of hydrogen storage materials, limit the wide utilization of hydrogen energy, and high temperature of hydrogen absorption and desorption, and achieve cheap additives. The effect of easy availability, improved kinetics of hydrogen absorption and desorption, and simple preparation process

Active Publication Date: 2019-10-11
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The study by Zhang et al. showed that Li 2 TiO 3 It exhibits excellent catalytic effect in the Li-N-H system, and it is considered that Li 2 TiO 3 The special crystal structure is conducive to the migration of Li ions, which improves the diffusion of Li ions in the system and thus improves the hydrogen storage performance of the system (RSC Advances, 5(24), 18375-18378, 2015), but Li 2 TiO 3 higher price cost
In short, the existing Li-N-H system hydrogen storage materials generally have the disadvantages of high hydrogen absorption and desorption temperature and slow hydrogen absorption and desorption speed, which affect the practical process of hydrogen storage materials and limit the wide utilization of hydrogen energy.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this embodiment, a method for preparing a Li-N-H system hydrogen storage material comprises the following steps:

[0021] a. Using lithium amide powder with a purity of 95wt.% and lithium hydride powder with a purity of 98wt.% as the main raw materials, according to the molar ratio of lithium amide and lithium hydride at a ratio of 1:1.1, at a high purity of 99.999% Under the protection of pure Ar atmosphere, weigh lithium amide powder and lithium hydride powder in a glove box, and add Na with a purity of 99wt.%. 2 SO 4 The powder is mixed as an additive to prepare 300 mg of a raw material mixture, wherein, Na 2 SO 4 The added mole percentage is 1.0mol% of the total molar weight of lithium amide and lithium hydride in the raw material mixture as the main raw material components;

[0022] b. the raw material mixture prepared in the step a is subjected to ball milling, in order to prevent the raw material mixture from being oxidized, the sample loading of the raw ma...

Embodiment 2

[0026] This embodiment is basically the same as Embodiment 1, especially in that:

[0027] In this embodiment, a method for preparing a Li-N-H system hydrogen storage material comprises the following steps:

[0028]a. Using lithium amide powder with a purity of 95wt.% and lithium hydride powder with a purity of 98wt.% as the main raw materials, according to the molar ratio of lithium amide and lithium hydride at a ratio of 1:1.1, at a high purity of 99.999% Under the protection of pure Ar atmosphere, weigh lithium amide powder and lithium hydride powder in a glove box, and add K with a purity of 99wt.%. 2 SO 4 The powder is mixed as an additive to prepare 300 mg of a raw material mixture, wherein K 2 SO 4 The added mole percentage is 1.0mol% of the total molar weight of lithium amide and lithium hydride in the raw material mixture as the main raw material components;

[0029] b. This step is the same as in Embodiment 1.

[0030] Experimental test analysis:

[0031] Diffe...

Embodiment 3

[0033] This embodiment is basically the same as the previous embodiment, and the special features are:

[0034] In this embodiment, a method for preparing a Li-N-H system hydrogen storage material comprises the following steps:

[0035] a. Using lithium amide powder with a purity of 95wt.% and lithium hydride powder with a purity of 98wt.% as the main raw materials, according to the molar ratio of lithium amide and lithium hydride at a ratio of 1:1.1, at a high purity of 99.999% Under the protection of pure Ar atmosphere, weigh lithium amide powder and lithium hydride powder in a glove box, and add Rb with a purity of 99wt.%. 2 SO 4 The powder is mixed as an additive to prepare 300 mg of raw material mixture, wherein, Rb 2 SO 4 The added mole percentage is 1.0mol% of the total molar weight of lithium amide and lithium hydride in the raw material mixture as the main raw material components;

[0036] b. This step is the same as in Embodiment 1.

[0037] Experimental test an...

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Abstract

The invention discloses an Li-N-H system hydrogen storage material and a preparation method thereof. The Li-N-H system hydrogen storage material is prepared from LiNH2, LiH and a small quantity of alkali metal sulfate additive. The preparation method comprises the following steps: by taking the LiNH2 and the LiH with the molar ratio being 1 to 1.1 and the additive with the molar percentage content being 0.5-5 mol percent, carrying out ball milling treatment at the 1MPa hydrogen atmosphere under the condition of shielding gas to prepare the Li-N-H system hydrogen storage material. The invention develops a novel Li-N-H system hydrogen storage material with rapid hydrogen desorption speed and good cycle stability, so that the hydrogen desorption peak temperature of an Li-N-H system is lowered by 25-39 DEG C, the hydrogen absorption and desorption dynamic performance of the Li-N-H system is effectively improved, and practical course of the storage materials in the type is effectively promoted. The preparation method of the material is simple and feasible in operation, cheap and available in additive and low in preparation method and has an industrial prospect and an application value.

Description

technical field [0001] The invention relates to a hydrogen storage material and a preparation method thereof, in particular to a coordination hydride hydrogen storage material and a preparation method thereof, which are applied in the technical field of solid-state hydrogen storage. Background technique [0002] With the increasingly prominent problems of energy shortage and environmental pollution, the development and utilization of new energy and clean energy has attracted more and more attention. Among many new energy sources, hydrogen energy has been placed high hopes by people. The hydrogen energy system mainly includes three links of hydrogen production, storage and transportation, and application, and the storage of hydrogen energy is the key, and it is also one of the main technical obstacles to the application of hydrogen energy at present. The current hydrogen storage technologies are mainly divided into gaseous, liquid and solid state storage. Solid-state hydrog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/00
CPCC01B3/0078C01P2002/88C01P2004/80Y02E60/32
Inventor 冷海燕沈彬李谦周国治
Owner SHANGHAI UNIV