Preparation method for V-Ti-based hydrogen storage alloy

A hydrogen storage alloy, v-ti technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problem of high impurity content, achieve the effect of low impurity content, speed up the reaction rate, and increase the solid-liquid contact area

Inactive Publication Date: 2016-03-30
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 preparation method for V-Ti-based hydrogen storage alloy. The preparation method comprises the steps that preparation of the V-Ti-based hydrogen storage alloy is conducted sequentially through a molten salt electrolysis method and a vacuum melting method; a cathode of the molten salt electrolysis method is prepared from vanadium oxide, titanic oxide, addition agents and binding agents through sintering, the cathode obtained through sintering and a graphite anode are subjected to a molten salt electrolysis reaction in a molten slat electrolyte, and V-Ti intermediate alloy is obtained; and vacuum refining is conducted on the V-Ti intermediate alloy, and the V-Ti-based hydrogen storage alloy is obtained. According to the preparation method, cheap metallic oxides serve as raw materials for preparing the V-Ti-based hydrogen storage alloy, and thus the preparation cost of the alloy is reduced easily; the alloy prepared through the method is flexible and adjustable in content, simple in technique and low in impurity content; no waste slag or smoke is generated, and environmental friendliness is achieved.

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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IPC IPC(8): C25C3/36C22C1/03H01M4/38
CPCH01M4/38C22C1/03C25C3/36Y02E60/10
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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