Effects of Heat Treatment on Properties of La0.7Mg0.3(Ni0.85Co0.15)3.4 Hydrogen Storage Electrode Alloy

Zhou Zenglin 1; 2  Song Yueqing 1; Huang Changgeng 2; Cui Shun 1; Zhang Yongjian 2; Li Xuejun 1; Huang Zhuo 1

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Effects of Heat Treatment on Properties of La_0.7Mg_0.3(Ni_0.85Co_0.15)_3.4 Hydrogen Storage Electrode Alloy

更新时间：2025-12-08

- Effects of Heat Treatment on Properties of La_0.7Mg_0.3(Ni_0.85Co_0.15)_3.4 Hydrogen Storage Electrode Alloy
- Vol. 41, Issue 11, Pages: 1373-1379(2007)
- 作者机构：
  
  1. 北京有色金属研究总院粉末冶金及特种材料研究所,北京,100088
  2. 厦门钨业股份有限公司海沧分公司,厦门,361026
- 作者简介：
- 基金信息：
- DOI：
  CLC： TG146.4
- Online First：10 November 2007，
  
  Published：2007
- 稿件说明：
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Zhou Zenglin 1, 2 Song Yueqing 1, Huang Changgeng 2, et al. Effects of Heat Treatment on Properties of La_0.7Mg_0.3(Ni_0.85Co_0.15)_3.4 Hydrogen Storage Electrode Alloy[J]. 2007, 41(11): 1373-1379.
DOI：

Zhou Zenglin 1, 2 Song Yueqing 1, Huang Changgeng 2, et al. Effects of Heat Treatment on Properties of La_0.7Mg_0.3(Ni_0.85Co_0.15)_3.4 Hydrogen Storage Electrode Alloy[J]. 2007, 41(11): 1373-1379. DOI：

摘要

用冷坩埚磁悬浮熔炼方法制备铸态La

0.7

0.3

(Ni

0.85

0.15

)

3.4

贮氢电极合金

并分别在1 073 K、1 173 K和1 273 K温度下热处理8 h得到热处理态合金

研究了合金的Mg含量、相结构、电化学性能、显微硬度及相应电极的表面状态.研究结果表明:合金中Mg的质量分数随着热处理温度的升高从2.38%降低到2.03%; 铸态及1 173 K热处理态合金的主相均为Ce

型六方相

还包括CaCu

型六方相、PuNi

型菱方相、MgCu

型立方相及BCr型正交相

热处理还使各组成相的晶胞体积均有所增加; 随着热处理温度的升高

合金放氢平台的平台压力先降低到0.004 3 MPa

然后升高到0.012 1 MPa

再降低到0.007 1 MPa; 合金电极的最大放电容量先增加到406.8 mA·h/g

然后减小到361.8 mA·h/g; 循环稳定性从铸态时的59.6%不断增加到76.0%.

Abstract

The as-cast La

0.7

0.3

(Ni

0.85

0.15

)

3.4

hydrogen storage electrode alloy was prepared by cold crucible melting

and then was heat-treated at 1 073 K

1 173 K or 1 273 K for 8 hours under argon gas atmosphere. The magnesium content

phase structure

microhardness of the alloys

and the electrochemical properties and surface of the corresponding electrodes were i

nvestigated. The results show that the as-cast alloy and the one heat-treated at 1 173 K the consist of hexagonal Ce

-type main-phase

hexagonal CaCu

-type phase

rhombohedral PuNi

-type phase

cubic MgCu

-type Laves-phase and orthorhombic BCr-type phase; with the increasing heat treatment temperature

the magnesium content decreases from 2.38% to 2.03%; the cell volume of all these phases increases; the hydrogen-desorption plateau pressure lowers to 0.004 3 MPa

then heightens to 0.012 1 MPa

and lowers again to 0.007 1 MPa; the maximum discharge capacity first increases to 406.8 mA·h/g and then reduces to 361.8 mA·h/g; and the cyclic stability is improved from 59.6% to 76.0% continuously.

关键词

Keywords

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