无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (6): 78-84.doi: 10.19964/j.issn.1006-4990.2022-0503

• 研究与开发 • 上一篇    下一篇

Zr/Mn元素替代及退火处理对汽车电池用储氢合金电化学性能的影响

李志强(), 郭正华, 何玉汝   

  1. 济源职业技术学院,河南 济源 459000
  • 收稿日期:2022-08-24 出版日期:2023-06-10 发布日期:2023-06-14
  • 作者简介:李志强(1988— ),男,讲师,现主要从事汽车电池材料研究;E-mail:2383376525@qq.com
  • 基金资助:
    河南省科技攻关计划项目(2102210237)

Effect of Zr/Mn element substitution and annealing treatment on electrochemical properties of hydrogen storage alloys for automotive batteries

LI Zhiqiang(), GUO Zhenghua, HE Yuru   

  1. Jiyuan Vocational and Technical College,Jiyuan 459000,China
  • Received:2022-08-24 Published:2023-06-10 Online:2023-06-14

摘要:

采用真空感应熔炼的方法制备了(La,Mg)1-x Zr x Ni3.3-2x Mn2xx=0、0.1、0.2)储氢合金,研究了Zr/Mn元素替代和退火处理对储氢合金相结构、显微形貌和电化学性能的影响。结果表明:Zr/Mn元素替代后储氢合金中出现了新相LaMgNi4相,退火处理后储氢合金中LaNi5相和LaMgNi4相含量减小,(La,Mg)2Ni7相和(La,Mg)5Ni19相含量增加;当储氢合金中x值从0增加至0.2时,储氢合金电极的活化次数Na逐渐减小、最大放电容量Cmax逐渐降低,且相同x值时退火态储氢合金电极的Cmax要高于铸态储氢合金电极。Zr/Mn元素替代会提高储氢合金电极的24 h荷电保持率、降低循环100次后的容量保持率,且退火后二者都会相对提高;铸态储氢合金电极的高倍率放电性能主要由氢扩散系数D0决定,而退火态储氢合金电极的高倍率放电性能主要由交换电流密度I0决定。

关键词: La-Mg-Ni储氢合金, Zr/Mn元素, 铸态和退火态, 相结构, 电化学性能

Abstract:

The(La,Mg)1-x Zr x Ni3.3-2x Mn2xx=0,0.1,0.2) hydrogen storage alloys were prepared by vacuum induction melting.The effect of Zr/Mn element substitution and annealing treatment on the phase structure,microstructure and electrochemical properties of the hydrogen storage alloys was studied.The results showed that a new phase of LaMgNi4 appeared in the hydrogen storage alloy after Zr/Mn element substitution,and the contents of LaNi5 phase and LaMgNi4 phase were decreased after annealing,the contents of(La,Mg)2Ni7 phase and(La,Mg)5Ni19 phase were increased.When the x value in the hydrogen storage alloy was increased from 0 to 0.2,the activation times Na of the hydrogen storage alloy electrode was gradually decreased,the maximum discharge capacity Cmax was gradually decreased,and the Cmax of the annealed hydrogen storage alloy electrode was higher than that of the cast hydrogen storage alloy electrode at the same x value.The substitution of Zr/Mn could improve the charge retention rate of hydrogen storage alloy electrode in 24 h and reduce the capacity retention rate after 100 cycles,and both of them would be relatively improved after annealing.The high rate discharge performance of cast hydrogen storage alloy electrode was mainly determined by hydrogen diffusion coefficient D0,while the high rate discharge performance of annealed hydrogen storage alloy electrode was mainly determined by exchange current density I0.

Key words: La-Mg-Ni hydrogen storage alloy, Zr/Mn element, cast and annealed, phase structure, electrochemical properties

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