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 ›› 2024, Vol. 56 ›› Issue (11): 51-58.doi: 10.19964/j.issn.1006-4990.2024-0003

• 新能源电池材料 • 上一篇    下一篇

退火处理对汽车电池用储氢合金相结构与电化学性能的影响

胡文娟1,2(), 申小中1,2, 王汝佳3, 路露1,2, 邹联力4   

  1. 1.无锡商业职业技术学院智能装备与汽车工程学院,江苏 无锡 214153
    2.江苏省新能源汽车核心部件 工程研究中心,江苏 无锡 214153
    3.江苏理工学院汽车与交通工程学院,江苏 常州 213001
    4.江苏大学材料科学与工程学院先进材料研究所,江苏 镇江 212013
  • 收稿日期:2024-01-03 出版日期:2024-11-10 发布日期:2024-11-27
  • 作者简介:胡文娟(1979— ),硕士,副教授,研究方向为汽车材料等;E-mail:huwenjuan@wxic.edu.cn
  • 基金资助:
    江苏省高校自然科学基金面上项目(22KJD480002)

Effect of annealing temperature on phase structure and electrochemical performance of hydrogen storage alloys for automotive batteries

HU Wenjuan1,2(), SHEN Xiaozhong1,2, WANG Rujia3, LU Lu1,2, ZOU Lianli4   

  1. 1.Department of Intelligent Equipment and Automotive Engineering,Wuxi Vocational Institute of Commerce,Wuxi 214153,China
    2.Jiangsu Province Engineering Research Center of Key Components for New Energy Vehicle,Wuxi 214153,China
    3.School of automobile and traffic engineering,Jiangsu University of Technology,Changzhou 213001,China
    4.Institute for Advanced Materials,School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China
  • Received:2024-01-03 Published:2024-11-10 Online:2024-11-27

摘要:

为了提升汽车电池负极用储氢合金的电化学性能,对铸态Y0.2La0.8Ni3.2Al0.2Mn0.2储氢合金进行了850~1 050 ℃保温4 h的退火处理,并对比分析了铸态和退火态储氢合金的相结构、微观形貌和电化学性能(充放电曲线、压力-组成-温度曲线、循环曲线、极化曲线和倍率放电曲线)。结果表明:铸态和低温(850、900 ℃)退火态Y0.2La0.8Ni3.2Al0.2Mn0.2储氢合金主要由CaCu5型相、Ce2Ni7/Gd2Co7型相和Ce5Co19型相组成;950 ℃及以上温度退火态储氢合金由Ce2Ni7型相和Ce5Co19型相组成,Ce2Ni7型相丰度在退火温度为950 ℃时取得最大值。退火态储氢合金的最大放电容量(Cmax)均高于铸态储氢合金,且随着退火温度的升高,退火态储氢合金的Cmax先增加后减小,在退火温度为950 ℃时取得最大值(372.6 mA·h/g)。随着退火温度的升高,Y0.2La0.8Ni3.2Al0.2Mn0.2储氢合金的高倍率放电性能先升高后降低,在相同放电电流密度下,950 ℃退火态Y0.2La0.8Ni3.2Al0.2Mn0.2储氢合金的高倍率放电性能最佳。Y0.2La0.8Ni3.2Al0.2Mn0.2储氢合金的高倍率放电性能主要由氢扩散系数(D0)控制,通过调整退火温度可以获得电化学性能良好的Y0.2La0.8Ni3.2Al0.2Mn0.2储氢合金,适宜的退火温度为950 ℃。

关键词: Y0.2La0.8Ni3.2Al0.2Mn0.2储氢合金, 退火温度, 相结构, 显微形貌, 电化学性能

Abstract:

In order to improve the electrochemical performance of hydrogen storage alloys for automotive battery cathodes,as-cast Y0.2La0.8Ni3.2Al0.2Mn0.2 hydrogen storage alloys were annealed at 850~1 050 ℃ holding for 4 h,the phase composition,microstructure and electrochemical properties(charge discharge curve,pressure composition temperature curve,cycle curve,polarization curve,and rate discharge curve) of as-cast and annealed hydrogen storage alloys at different temperatures were compared and analyzed.The results showed that the as-cast and low-temperature(850,900 ℃) annealed Y0.2La0.8Ni3.2Al0.2Mn0.2 hydrogen storage alloys were mainly composed of CaCu5 type phase,Ce2Ni7/Gd2Co7 type phase,and Ce5Co19 type phase,the hydrogen storage alloys annealed at 950 ℃ and above were mainly composed of Ce2Ni7 type phase and Ce5Co19 type phase.The maximum abundance of Ce2Ni7 type phase was obtained at 950 ℃.Cmax of annealed hydrogen storage alloys was higher than that of cast hydrogen storage alloys,and with the increase of annealing temperature,the maximum discharge capacity of annealed Y0.2La0.8Ni3.2Al0.2Mn0.2 hydrogen storage alloy was firstly increased and then decreased,the Cmax was achieved(372.6 mA·h/g) at 950 ℃.With the increase of annealing temperature,the high rate discharge performance of Y0.2La0.8Ni3.2Al0.2Mn0.2 hydrogen storage alloy was firstly increased and then decreased.At the same discharge current density,the high rate discharge performance of Y0.2La0.8Ni3.2Al0.2Mn0.2 hydrogen storage alloy annealed at 950 ℃ was the highest.The high rate discharge performance of Y0.2La0.8Ni3.2Al0.2Mn0.2 hydrogen storage alloy was mainly controlled by the hydrogen diffusion coefficient D0,Y0.2La0.8Ni3.2Al0.2Mn0.2 hydrogen storage alloy with good electrochemical performance could be obtained by adjusting the annealing temperature,and the suitable annealing temperature was 950 ℃.

Key words: Y0.2La0.8Ni3.2Al0.2Mn0.2 hydrogen storage alloy, annealing temperature, phase structure, microscopic morphology, electrochemical performance

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