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材料导报  2021, Vol. 35 Issue (6): 6140-6145    https://doi.org/10.11896/cldb.20010041
  金属与金属基复合材料 |
相组成对La0.75Mg0.25Ni3.5储氢合金电化学性能的影响
焦齐统, 潘炜, 朱帅, 陈翔宇, 杨宁, 陈建, 顾晨宇, 邱天, 刘晶晶
扬州大学机械工程学院,扬州 225127
Effects of Phase Composition on Electrochemical Properties of La0.75Mg0.25Ni3.5 Hydrogen Storage Alloy
JIAO Qitong, PAN Wei, ZHU Shuai, CHEN Xiangyu, YANG Ning, CHEN Jian, GU Chenyu, QIU Tian, LIU Jingjing
School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China
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摘要 La-Mg-Ni基超晶格储氢合金与传统AB5型合金相比,具有优越的电化学容量,近年来受到研究者们的广泛关注,但是其合金相组成复杂,综合电化学性能尤其是循环稳定性有待提高。本工作通过将A2B7型La0.75Mg0.25Ni3.5合金在1 203 K下退火40 h,制备了只含有(La,Mg)2Ni7和(La,Mg)5Ni19超晶格结构的合金,并研究了相转变对合金电化学性能的影响。研究表明,铸态合金含有(La,Mg)Ni3、(La,Mg)2Ni7和(La,Mg)5Ni9超晶格相以及LaNi5相,在退火过程中,位于相图相对边缘位置的LaNi5相和(La,Mg)Ni3相消失,得到了只含有(La,Mg)2Ni7和(La,Mg)5Ni9超晶格的双相合金。超晶格相总量的增加伴随着元素组成的均匀化和应力的降低,这不但有效提高了合金的储氢容量,而且减轻合金在充/放电循环过程中的粉化和氧化,显著提高合金电极的循环稳定性。合金电极的最大放电容量由铸态的355 mAh·g-1提高到退火态的367 mAh·g-1,100周的循环稳定性由57.97%显著提高到81.47%。但是由于合金中的缺陷和晶界的减少,合金的高倍率放电性能有所降低。
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焦齐统
潘炜
朱帅
陈翔宇
杨宁
陈建
顾晨宇
邱天
刘晶晶
关键词:  镍氢电池  La-Mg-Ni基储氢合金  退火处理  相结构  电化学性能    
Abstract: Compared with traditional AB5-type alloys, La-Mg-Ni-based superlattice hydrogen storage alloys have superior electrochemical capacity, which has attracted extensive attention in recent years. In this work, an A2B7-type La0.75Mg0.25Ni3.5 alloy containing only (La,Mg)2Ni7 and (La,Mg)5Ni19 superlattice structure was prepared by annealing the as-cast alloy at 1 203 K for 40 h, and the effects of phase transformation on the electrochemical properties of the alloy has been studied. The results showed that the as-cast alloy contained (La,Mg)Ni3, (La,Mg)2Ni7 and (La,Mg)5Ni9 superlattice phases and LaNi5 phase. During annealing process, LaNi5 and (La,Mg)Ni3 phases at the relative edge of the phase diagram disappeared, resulting in the alloy containing only (La,Mg)2Ni7 and (La,Mg)5Ni9 superlattice phases. The increase of the superlattice phase amount was accompanied by the homogenization of the element composition and the reduction of stress, which not only effectively improved the hydrogen storage capacity of the alloy, but also reduced the pulverization and oxidation during charge/discharge cycling, thus significantly improving the cycling stability of the alloy electrode. The maximum discharge capacity of the alloy electrode increased from 355 mAh·g-1 of the as-cast alloy to 367 mAh·g-1 of the annealed alloy, and the cyclic stability significantly increased from 57.97% to 81.47%. However, because of the reduction of the defects and grain boundaries in the alloy, the high-rate discharge capacity of the alloy was slightly reduced.
Key words:  Ni/MH battery    La-Mg-Ni-based hydrogen storage alloy    annealing treatment    phase structure    electrochemical property
               出版日期:  2021-03-25      发布日期:  2021-03-23
ZTFLH:  TG139.7  
基金资助: 国家自然科学基金青年基金(51801176);江苏省自然科学基金青年基金(BK20170502);江苏省大学生创新创业训练计划项目基金(20191111707Y);扬州大学大学生创新创业训练计划项目/学术科技创新基金项目(X20190335)
通讯作者:  liujj@yzu.edu.cn   
作者简介:  焦齐统,2017年6月就读于扬州大学机械工程学院材料加工与控制工程专业,为“新能源材料研发与应用”课题组成员,研究镍氢电池负极材料La-Mg-Ni基储氢合金已有两年之久,精通合金制备和晶体结构分析。
潘炜,2017年6月就读于扬州大学机械工程学院材料加工与控制工程专业,进入“新能源材料研发与应用”课题组,一直致力于研究以镍氢电池为主的动力电池电化学性能的改善,精通电池组装、电化学性能测试和分析。
刘晶晶,扬州大学机械工程学院材料加工与控制工程系,副教授。2016年毕业于燕山大学环境与化学工程学院,化学工程博士学位。同年加入扬州大学机械工程学院材料系工作至今,主要从事先进储氢合金、动力电池及其应用以及金属功能材料研究。发表SCI学术论文40余篇。
引用本文:    
焦齐统, 潘炜, 朱帅, 陈翔宇, 杨宁, 陈建, 顾晨宇, 邱天, 刘晶晶. 相组成对La0.75Mg0.25Ni3.5储氢合金电化学性能的影响[J]. 材料导报, 2021, 35(6): 6140-6145.
JIAO Qitong, PAN Wei, ZHU Shuai, CHEN Xiangyu, YANG Ning, CHEN Jian, GU Chenyu, QIU Tian, LIU Jingjing. Effects of Phase Composition on Electrochemical Properties of La0.75Mg0.25Ni3.5 Hydrogen Storage Alloy. Materials Reports, 2021, 35(6): 6140-6145.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.20010041  或          http://www.mater-rep.com/CN/Y2021/V35/I6/6140
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