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A kind of preparation method of v-ti base hydrogen storage alloy

A technology of hydrogen storage alloys and mixtures, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of high impurity content, achieve the effects of low impurity content, speed up the reaction rate, and increase the solid-liquid contact area

Inactive Publication Date: 2017-11-10
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects and deficiencies in the prior art, the present invention uses the molten salt electrolysis method combined with the vacuum refining method to prepare V-Ti-based hydrogen storage alloys, which solves the problem of high impurity content in the existing preparation of V-Ti-based hydrogen storage alloys problem, simplifies the preparation process, and improves the quality of the alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The preparation method of V-Ti base hydrogen storage alloy of the present invention comprises:

[0027] A. Mix vanadium oxides, titanium oxides, binders and additives evenly, press them into shape with a press, and sinter at high temperature to make a solid cathode;

[0028] B. Under the protection of argon, carry out molten salt electrolysis reaction;

[0029] C. Clean and dry the cathode product after electrolysis, and carry out remelting, refining and proper composition adjustment under vacuum conditions;

[0030] D, out of the furnace to obtain a V-Ti-based hydrogen storage alloy.

[0031] Wherein, the vanadium oxide described in step A is V 2 o 3 powder, the titanium oxide is a kind of high titanium slag or titanium dioxide, and the additive is H 2 TiO 3 , CaCl 2 , V 2 o 5 The addition of additives is mainly to increase the porosity of the solid-state cathode, thereby increasing the solid-liquid contact area between the cathode and the molten salt. After c...

Embodiment 1

[0036] Example 1: Mix vanadium trioxide and titanium dioxide below 200 mesh at a mass ratio of 1:1 to obtain a mixed material, and add the additive CaCl to the mixed material 2 and binder polyvinyl alcohol (0.03g / ml), CaCl 2 The dosage of the additive is 5wt% of the total amount of the mixed material, and the dosage of the binder is 5ml per 100g of the mixed material. The mixed material with additives and binders was pressed and molded at 30 MPa, and fired at 1000° C. for 4 hours in a CO atmosphere to obtain a reactive cathode. Under Ar gas atmosphere, with CaCl 2 The molten salt is used as the electrolyte, the graphite block is used as the anode, and the cathode is subjected to reduction electrolysis, the electrolysis temperature is 950°C, the voltage is 3.0V, and the time is 10h. After the electrolysis, the cathode block was cooled to room temperature under an Ar gas atmosphere, and the V-Ti master alloy was obtained after cleaning. Determined by chemical analysis, the ob...

Embodiment 2

[0047] Example 2: Mix vanadium trioxide and titanium dioxide below 200 meshes at a mass ratio of 1:1.1 to obtain a mixed material, and add additive H to the mixed material 2 TiO 3 and binder polyvinyl alcohol (0.03g / ml), H 2 TiO 3 The dosage of the additive is 10wt% of the total amount of the mixed material, and the dosage of the binder is 3ml per 100g of the mixed material. The mixed material was press-molded at 30 MPa, and fired at 1000° C. for 4 hours in a CO atmosphere to obtain a reaction cathode. Under Ar gas atmosphere, with 80wt% CaCl 2 -20wt% NaCl molten salt is used as the electrolyte, graphite block is used as the anode, and the cathode is subjected to reduction electrolysis, the electrolysis temperature is 900°C, the voltage is 3.0V, and the time is 10h. After the electrolysis, the cathode block was cooled to room temperature under an Ar gas atmosphere, and the V-Ti master alloy was obtained after cleaning. Determined by chemical analysis, the obtained master ...

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Abstract

The invention discloses a method for preparing a V-Ti-based hydrogen storage alloy, which sequentially adopts a molten salt electrolysis method and a vacuum smelting method to prepare a V-Ti-based hydrogen storage alloy; the cathode of the molten salt electrolysis method uses vanadium oxidation material, titanium oxide, additives and binders are sintered, and the sintered cathode and graphite anode are subjected to molten salt electrolysis in a molten salt electrolyte to obtain a V-Ti master alloy; then the V-Ti master alloy is subjected to vacuum Refined to get V-Ti-based hydrogen storage alloy. The present invention uses relatively cheap metal oxides as raw materials to prepare V-Ti-based hydrogen storage alloys, which helps to reduce the preparation cost of the alloys. The alloys prepared by the present invention have flexible and adjustable components, simple processes, and low impurity content. The present invention does not It produces waste residue and smoke dust, which is friendly to the environment.

Description

technical field [0001] The invention belongs to the field of hydrogen storage alloy preparation, in particular to a preparation method of V-Ti based hydrogen storage alloy. Background technique [0002] V-Ti-based hydrogen storage alloys have the characteristics of large theoretical hydrogen storage capacity and good kinetics of hydrogen absorption and desorption at room temperature, which has aroused great interest of researchers in recent years. The preparation process mostly uses pure metals such as V and Ti as raw materials, which are repeatedly smelted in an induction furnace and obtained through subsequent heat treatment. Due to the high price of metal V and the high melting points of metals such as V and Ti, the preparation cost of V-Ti based hydrogen storage alloys is increased. [0003] Using VFe alloy instead of pure V for alloy preparation can reduce the preparation cost of V-Ti-based hydrogen storage alloy, but there are more impurities such as Al, Si, O, etc. i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36C22C1/03H01M4/38
CPCC22C1/03C25C3/36H01M4/38Y02E60/10
Inventor 王斌杜金晶俞娟方钊武小雷
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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