Modulating superlattice structure and cyclic stability of Ce2Ni7-type LaY2Ni10.5-based alloys by Mn, Al, and Zr substitutions
作者:
Zhao, SQ (Zhao, Shiqian) [1] ; Wang, H (Wang, Hui) [1] ; Yang, LC (Yang, Lichun) [1] ; Liu, JW (Liu, Jiangwen) [1] ; Ouyang, LZ (Ouyang, Liuzhang) [1] ; Zhu, M (Zhu, Min) [1]
查看 Web of Science ResearcherID 和 ORCID (由 Clarivate 提供) JOURNAL OF POWER SOURCES
卷524
文献号231067
DOI10.1016/j.jpowsour.2022.231067
出版时间MAR 15 2022
已索引2022-04-27
文献类型Article
摘要
It is a great challenge to achieve high capacity and long cyclic life for hydrogen storage electrode alloys in Ni-MH batteries, especially for superlattice alloys. This work investigates three series of single-phase LaY2Ni10.5-based alloys to tune the Ce2Ni7-type superlattice structure and electrochemical hydrogen storage properties by Mn, Al, and Zr substitutions. The Mn, Al substitutions for Ni could reduce the volume difference between [A(2)B(4)] and [AB(5)] subunits, thus greatly improving the cyclic performance. The maximum discharge capacity for the LaY2-Ni9.7Mn0.5Al0.3 alloy is 384.1 mAh g(-1), and the capacity retention S200 is as high as 76.1%. However, the partial replacement of Y with Zr dramatically reduces the discharge capacity and cyclic stability, although the subunit volume difference is even zero in the LaY1.75Zr0.25Ni9.7Mn0.5Al0.3 alloy. Detailed structural analysis shows that LaY1.75Zr0.25Ni9.7Mn0.5Al0.3 alloy exhibits greater a-axis expansion (delta a/a = 4.52%) and cell volume change (delta c/c = 15.46%) during charging than the Mn, Al-substituted alloys. The unusual expansion at the basal plane of [A(2)B(4)] and [AB(5)] subunits should be responsible for a considerable lattice strain (1.42%) and poor cyclic performance in the Zr-substituted alloys. This work provides new insights into the design of high capacity and long-life superlattice electrode alloys.
关键词
作者关键词Ni-MH batteriesLa-Y-Ni-based alloysSuperlattice structureSingle phaseCyclic stability
Keywords PlusNICKEL-METAL HYDRIDEHYDROGEN STORAGE ALLOYSELECTROCHEMICAL PROPERTIESDEGRADATION MECHANISMPHASE-TRANSFORMATIONNILABATTERIESABSORPTIONPERFORMANCE
作者信息
通讯作者地址
Wang, Hui
(通讯作者)
South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Sch Mat Sci & Engn, Guangzhou 510640, Peoples R China
地址
1 South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Sch Mat Sci & Engn, 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