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AB5 + x type hydrogen storage alloy with high corrosion resistance and long cycle life and preparation method of AB5 + x type hydrogen storage alloy

A technology of cycle life and hydrogen storage alloys, which is applied in the fields of instruments, electrical digital data processing, special data processing applications, etc., and can solve problems such as short life and poor corrosion resistance

Inactive Publication Date: 2018-08-10
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problems of poor corrosion resistance and short service life of current hydrogen storage alloys, the present invention proposes a hydrogen storage alloy with high corrosion resistance and super long cycle life and its preparation method

Method used

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  • AB5 + x type hydrogen storage alloy with high corrosion resistance and long cycle life and preparation method of AB5 + x type hydrogen storage alloy
  • AB5 + x type hydrogen storage alloy with high corrosion resistance and long cycle life and preparation method of AB5 + x type hydrogen storage alloy
  • AB5 + x type hydrogen storage alloy with high corrosion resistance and long cycle life and preparation method of AB5 + x type hydrogen storage alloy

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Embodiment approach

[0041] A method for designing and preparing a hydrogen storage alloy with high corrosion resistance and ultra-long life, comprising the following steps:

[0042] a. DFT simulation calculations are performed using Vienna ab initio Simulation Package (Vienna ab initio simulation package, namely VASP) software. The exchange correlation function is a PBE functional based on generalized gradient approximation. In order to consider the van der Waals interaction between atoms, the DFT-D3 dispersion correction based on Becke-Jonson damping (Bocke-Jonson damping) is adopted. The plane wave projection method is used to describe the interaction between ions and electrons;

[0043] b. The cut-off energy of the plane wave basis set is 400eV, and the convergence criterion of the electronic self-consistent field iteration is 10 -5 eV, the convergence criterion for atomic geometry optimization is

[0044] c. The Brillouin zone is divided into 3×3×1 K-point grids according to the Monkhors...

Embodiment 1

[0048] The preparation process and steps in this embodiment are as follows:

[0049] (1) According to La 0.73 Ce 0.17 Y 0.1 Ni 3.45 co 1.0 mn 0.3 Al 0.35 The chemical proportions are mixed, and lanthanum, cerium, yttrium, nickel, cobalt, manganese, and aluminum with a purity ≥ 99.5 are smelted by vacuum induction melting in a high-purity argon atmosphere at a melting temperature of 1300 ° C to obtain ingots. The ingot is then kept under the argon protective atmosphere at 1273K for 5 hours, and then quickly cooled with the furnace fan to ensure that the furnace temperature drops below 500°C within 5 minutes. Finally, the annealed alloy is powdered under the protection of inert gas or low-temperature liquid nitrogen, and the alloy powder with an average particle size of 45-55 μm can be obtained;

[0050] (2) Hydrogen absorption and desorption equilibrium pressure test method of hydrogen storage alloy powder: the pressure-composition (P-C) isotherm test is carried out on a...

Embodiment 2

[0056] The preparation process and steps in this embodiment are as follows:

[0057] (1) According to La 0.73 Ce 0.17 Y 0.1 Ni 3.55 co 1.0 mn 0.3 Al 0.35 The chemical proportions are mixed, and lanthanum, cerium, yttrium, nickel, cobalt, manganese, and aluminum with a purity ≥ 99.5 are smelted by vacuum induction melting in a high-purity argon atmosphere at a melting temperature of 1300 ° C to obtain ingots. The ingot is then kept under the argon protective atmosphere at 1273K for 5 hours, and then quickly cooled with the furnace fan to ensure that the furnace temperature drops below 500°C within 5 minutes. Finally, the annealed alloy is powdered under the protection of inert gas or low-temperature liquid nitrogen to obtain alloy powder with an average particle size of 45-55 μm;

[0058] (2) Hydrogen absorption and desorption equilibrium pressure test method of hydrogen storage alloy powder: the pressure-composition (P-C) isotherm test is carried out on a PCT tester, an...

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Abstract

The invention relates to an AB5 + x type hydrogen storage alloy with high corrosion resistance and long cycle life and a preparation method of the AB5 + x type hydrogen storage alloy. According to thedensity functional theory method, namely a DFT method, the essence of the capacity attenuation of the hydrogen storage alloy is discussed, the energy changes before and after corrosion of different systems in the alloy are calculated, and the corrosion resistance of different systems is studied. The DFT simulation result shows that the corrosion of the AB5 type hydrogen storage alloy can be divided into two stages, the first stage is corrosion of rare earth elements on the side A, the second stage is corrosion of elements such as nickel cobalt at the side B, and the corrosion resistance of the second stage can be improved to make the corrosion resistance and the cycle life of the alloy be effectively improved. According to the result, the Ni atom with high coordination number can be obtained through the replacement of La by the Ni partly, so that the alloy has stronger corrosion resistance in the second stage. Under the guidance of the theory, a hydrogen storage alloy series with highcorrosion resistance and long cycle life is designed and prepared, and the cycle life can reach 2415 times and is close to 5 times of the cycle life of the traditional commercial hydrogen storage alloy.

Description

technical field [0001] The invention belongs to the technical field of high-performance hydrogen storage alloys. Background technique [0002] New energy vehicles play a key role in reducing greenhouse gas emissions and addressing the global energy crisis, while nickel metal hydride batteries, referred to as nickel-metal hydride batteries, have a series of significant technical advantages in this field: excellent safety, consistency , environmental friendliness and temperature applicability, simple grouping technology, high recyclable value, etc. However, limited by the short cycle life of hydrogen storage alloys as anode materials, the cost of nickel-metal hydride batteries has remained high, which has become the biggest obstacle to their large-scale application in the field of new energy vehicles. Therefore, it is imperative to develop hydrogen storage alloys for Ni-MH batteries with ultra-long cycle life. At the same time, the existing methods for evaluating the corrosi...

Claims

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Application Information

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IPC IPC(8): C22C19/03C22C30/00C22C1/02G06F19/00
Inventor 杨春成陈莹王常春周亦彤文子赵明李建忱蒋青
Owner JILIN UNIV
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