Structural evolution and electrochemical hydrogen storage properties of single-phase A5B19-type (La0.33Y0.67)5Ni17.6Mn0.9Al0.5 alloy
作者:Zhao, SQ (Zhao, Shiqian) [1] ; Yang, LC (Yang, Lichun) [1] ; Liu, JW (Liu, Jiangwen) [1] ; Ouyang, LZ (Ouyang, Liuzhang) [1] ; Zhu, M (Zhu, Min) [1] ; Wang, H (Wang, Hui) [1]
卷548
文献号232039
DOI10.1016/j.jpowsour.2022.232039
出版时间NOV 15 2022
在线发表SEP 2022
已索引2022-10-21
文献类型Article
摘要
La-Y-Ni-based superlattice alloys demonstrate the potential as high-capacity anodes for Nickel-metal hydride batteries. However, the usual multi-phase structure formed in A5B19-type La-Y-Ni-based alloys makes precise investigations of composition-structure-performance relationships difficult. This work optimizes the quenching temperature to obtain the single-phase (La0.33Y0.67)5Ni17.6Mn0.9Al0.5 alloy with a hexagonal 2H-Pr5Co19 struc-ture. The single-phase alloy exhibits better overall electrochemical properties than multi-phase alloys, such as the maximum discharge capacity of 368.8 mAh g-1, the capacity retention at the 200th cycle of 73.4%, and the rate performance at a high discharge current of 1500 mA g-1 of 58.6%. The ex-situ X-ray diffraction research reveals that during charging, the single-phase alloy sequentially forms beta and gamma hydrides, with the beta hydride exhibiting the highest lattice strain, mainly due to the asynchronous hydrogenation and expansion between [A2B4] and [AB5]-2 subunits. This work offers meaningful guidance for developing high-performance La-Y-Ni-based electrode alloys.
关键词
作者关键词Ni-MH batteriesLa-Y-Ni-based alloysSuperlattice structureSubunit volumeCycling stability
Keywords PlusNICKEL-METAL HYDRIDEANNEALING TEMPERATURECYCLIC STABILITYNIBATTERIESPERFORMANCEMECHANISMA(2)B(7)SYSTEMMN
作者信息
通讯作者地址
Wang, Hui
(通讯作者)
South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China
所属机构
South China University of Technology
地址
1 South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China
电子邮件地址mehwang@scut.edu.cn
类别/分类
研究方向ChemistryElectrochemistryEnergy & FuelsMaterials Science
引文主题
2 Chemistry
2.282 Hydrogen Chemistry & Storage
2.282.594 Hydrogen Storage
Sustainable Development Goals
07 Affordable and Clean Energy
Web of Science 类别Chemistry, PhysicalElectrochemistryEnergy & FuelsMaterials Science, Multidisciplinary