A vanadium-based hydrogen storage alloy and its preparation method and application

A hydrogen storage alloy, vanadium-based technology, applied in nickel batteries, structural parts, alkaline batteries, etc., can solve the problems of low discharge capacity, poor kinetic performance, and high cost, and achieve increased discharge capacity and improved electrochemical kinetics. performance effect

Active Publication Date: 2022-06-21
PANZHIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the existing Ni-MH battery has low discharge capacity and poor kinetic performance, resulting in high cost

Method used

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  • A vanadium-based hydrogen storage alloy and its preparation method and application
  • A vanadium-based hydrogen storage alloy and its preparation method and application
  • A vanadium-based hydrogen storage alloy and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The chemical formula of rare earth modified vanadium-based hydrogen storage alloy is V 2 TiNi 0.5 Cr 0.5 Mx, where M is La, and x=0.02 to 0.15.

[0027] The specific manufacturing method is to weigh V, Ti, Ni, Cr and La particles or powders according to the stoichiometric ratio, put them into a vacuum non-consumable arc melting furnace, and vacuum to 10 -3 After Pa, the alloy is smelted and taken out after water cooling. The smelted alloy is loaded into a hydrogenation device, and hydrogen is absorbed and released repeatedly to prepare alloy powder for battery assembly.

[0028] Charge-discharge performance test: After the hydrogen storage alloy powder and the nickel hydroxide powder are mixed uniformly in a ratio of 1:4, they are pressed on a nickel foam sheet under a pressure of 20MPa. The diameter of the pressed sample is 10mm. ) 2 / NiOOH, Hg / HgO electrodes were used as reference electrodes. The electrolyte adopts 7mol / L KOH solution, and the test environment t...

Embodiment 2

[0030] The chemical formula of the rare earth-modified vanadium-based hydrogen storage alloy is V2TiNi0.5Cr0.5Mx, wherein M is Ce, and x=0-0.1.

[0031] The specific manufacturing method is to weigh V, Ti, Ni, Cr and Ce particles or powders according to the stoichiometric ratio, put them into a vacuum non-consumable arc melting furnace, and vacuumize to 10 -3 After Pa, the alloy is smelted and taken out after water cooling. The smelted alloy is loaded into a hydrogenation device, and hydrogen is absorbed and released repeatedly to prepare alloy powder for battery assembly.

[0032] Charge-discharge performance test: After the hydrogen storage alloy powder and the nickel hydroxide powder are mixed uniformly in a ratio of 1:4, they are pressed on a nickel foam sheet under a pressure of 20MPa. The diameter of the pressed sample is 10mm. ) 2 / NiOOH, Hg / HgO electrodes were used as reference electrodes. The electrolyte adopts 7mol / L KOH solution, and the test environment temperat...

Embodiment 3

[0034] The chemical formula of the rare earth-modified vanadium-based hydrogen storage alloy is V2TiNi0.5Cr0.5Mx, wherein M is Y, and x=0.02-0.08.

[0035] The specific manufacturing method is to weigh V, Ti, Ni, Cr and Y particles or powders according to the stoichiometric ratio, put them into a vacuum non-consumable arc melting furnace, and vacuum to 10 -3 After Pa, the alloy is smelted and taken out after water cooling. The smelted alloy is loaded into a hydrogenation device, and hydrogen is absorbed and released repeatedly to prepare alloy powder for battery assembly.

[0036] Charge-discharge performance test: After the hydrogen storage alloy powder and the nickel hydroxide powder are mixed uniformly in a ratio of 1:4, they are pressed on a nickel foam sheet under a pressure of 20MPa. The diameter of the pressed sample is 10mm. ) 2 / NiOOH, Hg / HgO electrodes were used as reference electrodes. The electrolyte adopts 7mol / L KOH solution, and the test environment temperature...

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Abstract

The invention discloses a vanadium-based hydrogen storage alloy, which belongs to the technical field of nickel-hydrogen battery development. The chemical formula of this alloy is V 2 TiNi 0.5 Cr 0.5 m x , wherein 0<x≤0.2, M is at least one of La, Ce, Y, Sc, Nd, Gd, Er and Yb. The present invention considers the advantages and disadvantages of rare-earth hydrogen storage alloys and vanadium-based hydrogen storage alloys, adopts V, Ti, Cr, and Ni as matrix alloys, and La, Ce, Y, Sc, Nd, Gd, Er, and Yb in rare earths are After introducing rare earth elements into modified metals and vanadium-based hydrogen storage alloys, on the one hand, the discharge capacity of the hydrogen storage alloy as the negative electrode material of the nickel-hydrogen battery can be improved, and on the other hand, the electrochemical kinetic performance of the alloy electrode can be improved. The technical problems of low actual discharge capacity and insufficient kinetic performance of the existing nickel-hydrogen battery are solved.

Description

technical field [0001] The invention discloses a vanadium-based hydrogen storage alloy, a preparation method and application thereof, and belongs to the technical field of nickel-hydrogen battery development. Background technique [0002] Nickel-metal hydride battery is an alkaline rechargeable battery that has been vigorously researched and developed at home and abroad in recent years. It has high specific energy, does not pollute the environment, has no memory effect, and has good resistance to overcharge and overdischarge. , instruments and toys and other fields are more and more widely used, nickel-hydrogen batteries are divided into high-voltage nickel-hydrogen batteries and low-voltage nickel-hydrogen batteries. The positive active material of nickel-hydrogen battery is Ni(OH) 2 (called NiO electrode), the negative active material is metal hydride, also known as hydrogen storage alloy (electrode is called hydrogen storage electrode). However, the actual low discharge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M10/30
CPCH01M4/383H01M10/30Y02E60/10
Inventor 同艳维崔旭梅张雪峰李娜丽邓刚王舟
Owner PANZHIHUA UNIV
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