摘要
对易挥发金属Mg进行合金化处理,采用自制的二次加料设备和自动浇铸设备,通过真空感应熔炼法制备了La_(0.47-x)Sm_(0.53)Mg_(x)Ni_(3.35)Al_(0.15)储氢合金,研究了合金组分和退火温度对合金热力学性能和电化学性能的影响。测试结果表明,Mg合金化处理和二次加料方式有利于合金组分的控制;金属Mg含量的增加,有利于合金最大放电容量的提高和合金倍率性能的提高,但降低了合金的循环稳定性;退火温度的提高,有利于合金的循环寿命,但使合金倍率性能下降;采用T+50℃、保温10 h退火制度的合金La_(0.32)Sm_(0.53)Mg_(0.15)Ni_(3.35)Al_(0.15),组分均匀,Ce_(2)Ni_(7)相丰度达到91.97%;最大放电容量可达355.3 mA·h/g;容量保持率80%的循环次数大于200周;HRD3500>60%,综合性能较为优越。
We prepared a La_(0.47-x)Sm_(0.53)Mg_(x)Ni_(3.35)Al_(0.15)hydrogen storage alloy via a vacuum induction melting method using self-made secondary charging and automatic pouring equipment with alloyed Mg metal,and studied the effects of composition and annealing temperature on the alloys’thermodynamic and electrochemical properties.The results show that alloying treatment of Mg and the secondary charging benefit the control of alloy composition.With the increase of Mg content,the maximum discharge capacity and the rate performance of the alloy are improved,however,the cycle stability of the alloy is reduced.Furthermore,the rise of annealing temperature enhances the cycling stability of the alloy,while impairs the high rate performance.It is found that the La_(0.32)Sm_(0.53)Mg_(0.15)Ni_(3.35)Al_(0.15)alloy after annealing at T+50℃for 10 h presents good compositional uniformity and stands out in overall performance,where the phase content of Ce_(2)Ni_(7)reaches to 91.97%(mass fraction)and it delivers a maximum discharge capacity of 355.3 mA·h/g,with an 80%capacity retention after cycling more than 200 cycles.Besides,the alloys give more than 225.6 mA·h/g at a high rate current density of 3500 mA/g.
作者
朱晓梅
罗统钊
蒋志军
景永强
王永光
胡艳华
刘治平
ZHU Xiao-mei;LUO Tong-zhao;JIANG Zhi-jun;JING Yong-qiang;WANG Yong-guang;HU Yan-hua;LIU Zhi-ping(Ordos Institute of Applied Technology,Ordos 017000,China;Inner Mongolia Rare Earth Ovonic Metal Hydride Co.,Ltd.,Baotou 014030,China;Baotou Haoming Rare Earth New Power Supply Technology Co.,Ltd.,Baotou 014030,China)
出处
《稀土》
CAS
CSCD
北大核心
2022年第4期121-128,共8页
Chinese Rare Earths
基金
2019年内蒙古自治区科技项目
2021年鄂尔多斯市科技项目(2021YYI 37-44)
2021年内蒙古自治区大学生创新创业项目(202114532006)
2020年中央引导地方科技发展资金项目(2020ZY0032)
2019年鄂尔多斯市科技项目(2019501)
关键词
镁基储氢合金
电化学性能
退火工艺
magnesium-based hydrogen storage alloy
electrochemical performance
annealing process
作者简介
朱晓梅(1971-),女,辽宁凌海人,高级工程师,主要从事储能材料的研究,E-mail:reozhuxm@163.com;通讯作者:刘治平,教授级高级工程师,E-mail:relzp@163.com
