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A kind of vanadium-based alloy doped with lithium element and high hydrogen storage capacity and preparation method thereof

An element and hydrogen storage technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of limited effective utilization and industrial application, unsatisfactory cycle stability, and hysteresis of hydrogen absorption and desorption pressure. Achieving broad application prospects and industrial application value, easy implementation, and improved hydrogen storage kinetics

Active Publication Date: 2017-03-29
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, vanadium-based hydrogen storage alloys also have disadvantages such as low effective hydrogen desorption capacity, large hydrogen absorption and desorption pressure hysteresis, unsatisfactory cycle stability, and high cost of metal V, which limit their effective utilization and industrial application.

Method used

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  • A kind of vanadium-based alloy doped with lithium element and high hydrogen storage capacity and preparation method thereof
  • A kind of vanadium-based alloy doped with lithium element and high hydrogen storage capacity and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0017] A vanadium-based alloy with high hydrogen storage capacity doped with lithium, consisting of vanadium-based alloy and Li, with the general formula Ti 5 V 55 Cr 30 m 5 Li 5 , the M-doped metal is a V-Fe alloy with a mass ratio of 1:1; its preparation steps are as follows:

[0018] 1) Preparation of vanadium-based alloy

[0019] After the Ti, V, Cr and doped metal V-Fe alloy with a purity ≥ 99.9wt% are pickled with a hydrochloric acid solution with a concentration of 1mol / L, alkaline washed with a sodium hydroxide solution with a concentration of 1mol / L, and washed with water, Put it into the induction furnace according to the proportion, and melt it into a cast alloy at a temperature of 1800°C under the condition of 0.05MPa high-purity argon atmosphere and magnetic stirring. The melting time is 10 minutes. Carrying out the above-mentioned smelting process, so repeated smelting 3 times until a uniform vanadium-based alloy ingot is obtained;

[0020] 2) Crush the abo...

Embodiment 2

[0026] A vanadium-based alloy with high hydrogen storage capacity doped with lithium, consisting of vanadium-based alloy and Li, with the general formula Ti 7 V 60 Cr 25 m 4 Li 4 , M doping metal is zirconium; the lithium element is mixed with vanadium-based alloy with high hydrogen storage capacity.

[0027] 1) Preparation of vanadium-based alloy

[0028] After the Ti, V, Cr and doped metal zirconium with a purity ≥ 99.9wt% are acid-washed with a hydrochloric acid solution with a concentration of 1mol / L, alkali-washed with a sodium hydroxide solution with a concentration of 1mol / L and washed with water, the Put it into an induction furnace, and melt it into a cast alloy at a temperature of 1900°C under the condition of 0.05MPa high-purity argon atmosphere and magnetic stirring. process, so repeated smelting 3 times until a uniform vanadium-based alloy ingot is obtained;

[0029] 2) Crush the above-mentioned vanadium-based alloy ingot into a powder of less than 200 meshe...

Embodiment 3

[0033] A vanadium-based alloy with high hydrogen storage capacity doped with lithium, consisting of vanadium-based alloy and Li, with the general formula Ti 9 V 65 Cr 20 m 3 Li 3 , The M doping metal is manganese and iron with a mass ratio of 1:2; a vanadium-based alloy with high hydrogen storage capacity mixed with lithium is obtained.

[0034] 1) Preparation of vanadium-based alloy

[0035] After the Ti, V, Cr and doped metal manganese and iron with a purity of ≥99.9wt% are acid-washed with a concentration of 1mol / L hydrochloric acid solution, alkaline-washed with a concentration of 1mol / L sodium hydroxide solution and washed with water, Put it into the induction furnace according to the proportion, in the 0.05MPa high-purity argon atmosphere and under the condition of magnetic stirring, melt it into the cast alloy at a temperature of 1900 ° C, the melting time is 10 minutes, and turn the alloy ingot over after it is water-cooled until it solidifies, and re- Carrying ou...

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Abstract

The invention relates to a Li-doped vanadium-based alloy with high hydrogen storage capacity. The Li-doped vanadium-based (V-based) alloy comprises a vanadium-based alloy and Li and has a general formula represented by TimVxCryMzLin, wherein the percentage by mass of each element is as follows: m is equal to or greater than 5 and less than or equal to 15, y is equal to or greater than 15 and less than or equal to 30, z is equal to or greater than 1 and less than or equal to 5, n is equal to or greater than 1 and less than or equal to 5 and x is the balance; M is doped metal. The preparation method comprises the following steps of smelting the vanadium-based alloy into an as-cast alloy by virtue of an induction furnace, injecting the Li element into the surface layer of the alloy by carrying out high-temperature calcination on the metal Li and the vanadium-based as-cast alloy and activating the alloy to prepare the target product. The Li-doped vanadium-based alloy has the advantages that the preparation method is simple in process, is easy to implement and has strong practicality; by casting Li into the vanadium-based hydrogen storage alloy, the surface catalytic effect is achieved and is obvious; by adjusting the ratio of Li in the V-based alloy, a partial expensive pure metal vanadium is replaced by the inexpensive ferrovanadium alloy, so that the cost is reduced, the hydrogen storage kinetic performance of the product is greatly improved and thus the Li-doped vanadium-based alloy has wide application prospects and industrial application values.

Description

technical field [0001] The invention relates to the preparation of a hydrogen storage alloy, in particular to a lithium element doped vanadium-based alloy with high hydrogen storage capacity and a preparation method thereof. Background technique [0002] V-based hydrogen storage alloy is a new type of high-capacity hydrogen storage alloy with a body-centered cubic (BCC) structure of vanadium and solid solution as the main phase. Its theoretical hydrogen storage capacity is as high as 3.8 wt%, and hydrogen has a faster the diffusion speed. Therefore, it has become a research hotspot in recent years. However, vanadium-based hydrogen storage alloys also have disadvantages such as low effective hydrogen desorption capacity, large hydrogen absorption and desorption pressure hysteresis, unsatisfactory cycle stability, and high cost of metal V, which limit their effective utilization and industrial application. Therefore, there is an urgent need to develop low-cost, high-kinetic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/22C22F1/18C22C27/02
CPCC22C27/025C22F1/18C23C10/22
Inventor 王一菁袁华堂焦丽芳陈程成胥亚楠
Owner NANKAI UNIV
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