热处理对新能源汽车用稀土储氢合金电化学性能的影响  

Effect of heat treatment on electrochemical properties of rare-earth hydrogen storage alloy for new energy vehicle

作　　者：张俊[1] 徐增勇[1] 张太超[2] 贾广辉[1] 罗斌 Zhang Jun;Xu Zengyong;Zhang Taichao;Jia Guanghui;Luo Bin(College of Automotive,Henan Vocational and Technical College,Zhengzhou Henan 450005,China;College of Materials and Chemical Engineering,Zhongyuan University of Technology,Zhengzhou Henan 450007,China;BYD Automotive Industry Co.,Ltd.,Shenzhen Guangdong 518118,China)

机构地区：[1]河南交通职业技术学院汽车学院,河南郑州450005 [2]中原工学院材料与化工学院,河南郑州450007 [3]比亚迪汽车工业有限公司,广东深圳518118

出　　处：《金属热处理》2019年第1期49-53,共5页Heat Treatment of Metals

基　　金：2016年度河南省高等学校青年骨干教师培养技术项目(2016GGJS-248);2017年交通运输职业教育科研项目(2017B44)

摘　　要：研究了热处理温度和保温时间对La_(0. 88)Mg_(0. 12)Ni_(3. 42)Co_(0. 67)储氢合金物相组成、显微形貌和电化学性能的影响。结果表明:相较于铸态储氢合金,950℃×4 h热处理态储氢合金的比容量略有降低,但是200次循环容量衰减率明显低于铸态和其它热处理态储氢合金;不同温度热处理后,储氢合金中LaNi_5相的含量都有所降低,而900℃×4 h热处理后储氢合金中La_2Ni_7相的比例达到最大值; 950℃×4 h热处理态储氢合金具有较高的循环性能,而950℃×8 h热处理态储氢合金具有较高的比容量;随着热处理时间的延长,储氢合金中的LaNi_5相有朝La_2Ni_7相转变的特征。The effects of heat treatment temperature and holding time on the phase composition,microstructure and electrochemical properties of La0. 88Mg0. 12Ni3. 42Co0. 67 hydrogen storage alloy were studied. The results show that compared to the as-cast hydrogen storage alloy,the capacity of hydrogen storage alloy undergone 950 ℃ × 4 h heat treatment decrease slightly,but the attenuation rate of the 200 cycle is obviously lower than that of the as cast and other heat treated hydrogen storage alloys. After heat treatment at different temperatures,the content of LaNi5 phase in hydrogen storage alloys decreases,while the ratio of La2Ni7 phase reaches the maximum value after heat treatment at 900 ℃ × 4 h. The hydrogen storage alloy at 950 ℃ × 4 h heat treatment state has high cyclic performance,while the hydrogen storage alloy has a higher specific capacity at 950 ℃ × 8 h. With the prolongation of heat treatment time,the LaNi5 phase in the hydrogen storage alloy has a tendency toward La2Ni7 phase transition.

关 键 词：稀土储氢合金 热处理温度 保温时间 物相 电化学性能 

分 类 号：TG156[金属学及工艺—热处理]