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Title: Effect of substituting Ni with Cu on the cycle stability of La{sub 0.7}Mg{sub 0.3}Ni{sub 2.55-x}Co{sub 0.45}Cu {sub x} (x = 0-0.4) electrode alloy prepared by casting and rapid quenching

Abstract

In order to improve the cycle stability of the La-Mg-Ni system (PuNi{sub 3}-type) hydrogen storage alloy, Ni in the alloy was partly substituted by Cu. Hydrogen storage alloys La{sub 0.7}Mg{sub 0.3}Ni{sub 2.55-x}Co{sub 0.45}Cu {sub x} (x = 0, 0.1, 0.2, 0.3, 0.4) were prepared by casting and rapid quenching. The effects of substituting Ni with Cu and the quenching rate on the microstructures and the cycle stability of the as-cast and quenched alloys were investigated in detail. The results obtained by X-ray diffraction show that the as-cast and quenched alloys have a multiphase structure, including the (La, Mg)Ni{sub 3} phase, the LaNi{sub 5} phase and the LaNi{sub 2} phase, and the amount of the LaNi{sub 2} phase increased with the increase of the Cu content. The substitution and rapid quenching have an inappreciable influence on the phase compositions of the alloys, but both obviously changed the phase abundances of the alloys. The results derived by transmission electron microscopy confirm that the substitution of Cu for Ni is favourable for the formation of an amorphous phase in the as-quenched alloys. The results obtained by the electrochemical measurement indicate that substituting Ni with Cu improved the cycle stability. When the Cu contentmore » increases from 0 to 0.4, the cycle lives of the as-cast and rapidly solidified alloys increased from 72 cycles to 88 cycles and from 100 cycles to 122 cycles, respectively.« less

Authors:
 [1];  [2];  [1];  [3];  [1];  [3]
  1. School of Material, Inner Mongolia University of Science and Technology, Baotou 014010 (China)
  2. School of Material, Inner Mongolia University of Science and Technology, Baotou 014010 (China) and Department of Functional Material Research, Central Iron and Steel Research Institute, 76 Xueyuan Nan Road, Haidian District, 100081 Beijing (China). E-mail: zyh59@yahoo.com.cn
  3. Department of Functional Material Research, Central Iron and Steel Research Institute, 76 Xueyuan Nan Road, Haidian District, 100081 Beijing (China)
Publication Date:
OSTI Identifier:
21003542
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 58; Journal Issue: 3; Other Information: DOI: 10.1016/j.matchar.2006.05.005; PII: S1044-5803(06)00154-9; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; AMORPHOUS STATE; CASTING; CASTINGS; ELECTROCHEMISTRY; ELECTRODES; HYDROGEN STORAGE; MICROSTRUCTURE; QUENCHING; STABILITY; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION

Citation Formats

Ren Huiping, Zhang Yanghuan, Li, Bao-wei, Dong Xiaoping, Zhao Xiaolong, and Wang Xinlin. Effect of substituting Ni with Cu on the cycle stability of La{sub 0.7}Mg{sub 0.3}Ni{sub 2.55-x}Co{sub 0.45}Cu {sub x} (x = 0-0.4) electrode alloy prepared by casting and rapid quenching. United States: N. p., 2007. Web.
Ren Huiping, Zhang Yanghuan, Li, Bao-wei, Dong Xiaoping, Zhao Xiaolong, & Wang Xinlin. Effect of substituting Ni with Cu on the cycle stability of La{sub 0.7}Mg{sub 0.3}Ni{sub 2.55-x}Co{sub 0.45}Cu {sub x} (x = 0-0.4) electrode alloy prepared by casting and rapid quenching. United States.
Ren Huiping, Zhang Yanghuan, Li, Bao-wei, Dong Xiaoping, Zhao Xiaolong, and Wang Xinlin. Thu . "Effect of substituting Ni with Cu on the cycle stability of La{sub 0.7}Mg{sub 0.3}Ni{sub 2.55-x}Co{sub 0.45}Cu {sub x} (x = 0-0.4) electrode alloy prepared by casting and rapid quenching". United States. doi:.
@article{osti_21003542,
title = {Effect of substituting Ni with Cu on the cycle stability of La{sub 0.7}Mg{sub 0.3}Ni{sub 2.55-x}Co{sub 0.45}Cu {sub x} (x = 0-0.4) electrode alloy prepared by casting and rapid quenching},
author = {Ren Huiping and Zhang Yanghuan and Li, Bao-wei and Dong Xiaoping and Zhao Xiaolong and Wang Xinlin},
abstractNote = {In order to improve the cycle stability of the La-Mg-Ni system (PuNi{sub 3}-type) hydrogen storage alloy, Ni in the alloy was partly substituted by Cu. Hydrogen storage alloys La{sub 0.7}Mg{sub 0.3}Ni{sub 2.55-x}Co{sub 0.45}Cu {sub x} (x = 0, 0.1, 0.2, 0.3, 0.4) were prepared by casting and rapid quenching. The effects of substituting Ni with Cu and the quenching rate on the microstructures and the cycle stability of the as-cast and quenched alloys were investigated in detail. The results obtained by X-ray diffraction show that the as-cast and quenched alloys have a multiphase structure, including the (La, Mg)Ni{sub 3} phase, the LaNi{sub 5} phase and the LaNi{sub 2} phase, and the amount of the LaNi{sub 2} phase increased with the increase of the Cu content. The substitution and rapid quenching have an inappreciable influence on the phase compositions of the alloys, but both obviously changed the phase abundances of the alloys. The results derived by transmission electron microscopy confirm that the substitution of Cu for Ni is favourable for the formation of an amorphous phase in the as-quenched alloys. The results obtained by the electrochemical measurement indicate that substituting Ni with Cu improved the cycle stability. When the Cu content increases from 0 to 0.4, the cycle lives of the as-cast and rapidly solidified alloys increased from 72 cycles to 88 cycles and from 100 cycles to 122 cycles, respectively.},
doi = {},
journal = {Materials Characterization},
number = 3,
volume = 58,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}
  • The electrode alloys La{sub 0.7}Mg{sub 0.3}Co{sub 0.45}Ni{sub 2.55-x}Fe{sub x} (x = 0, 0.1, 0.2, 0.3, 0.4) are fabricated by casting and rapid quenching techniques. The effects of the substitution of Fe for Ni on the cycle stabilities as well as the structures of the alloys have been investigated thoroughly. The results indicate that the substitution of Fe for Ni significantly enhances the cycle stability of the alloys. Furthermore, the positive impact of such substitution on the cycle stability has been observed to be more pronounced for the as-quenched alloy as compared to that for the as-cast one. Scanning electron microscopymore » (SEM) studies demonstrate that all the alloys exhibit a multiphase structure comprising of two major phases (La, Mg)Ni{sub 3} and LaNi{sub 5} along with a residual phase of LaNi{sub 2}. The substitution of Fe for Ni has been observed to facilitate the formation of a like amorphous structure in the as-quenched alloy. With an increase in Fe contents, a significant grain refinement of the as-quenched alloy and an obvious enlargement in the lattice constants and the cell volumes of the alloys have been noticed.« less
  • Starting from elemental powder mixtures, single-phase La{sub x}Co{sub 3.6}Ni{sub 0.4}Sb{sub 12}(x=0, 0.1, 0.4, 0.6)-filled skutterudites were synthesized via the route of mechanical alloying-hot pressing (MA-HP) in this paper. With increasing of La fraction, the lattice spacing of filled skutterudite phase increases and its variation follows the Vegard's law. The magnitude of the Seebeck coefficient and electrical resistivity show slight increases with increasing of La filling fraction; thermal conductivity of the filled skutterudite decreases and the resultant figure of merit increases with increase of La filling fraction. The as-HPed filled skutterudite has a composite nanocrystalline microstructure, which includes some coral-like clustersmore » with relatively large spoke-like grains about 300nm in length and a superfine equiaxial nanocrystalline matrix with an average grain size of about 50nm. The coral-like cluster corresponds to the prime filled skutterudite formed directly by MA, while the filled skutterudite formed during hot pressing, which has the same nucleation condition and experiences less grain growth, develops equiaxially into the superfine nanocrystalline matrix.« less
  • Graphical abstract: Evolution of the c{sub hex.}/a{sub hex.} ratio with x in LiCo{sub 1−2x}Mn{sub x}Ni{sub x}O{sub 2} solid solution showing that less Li/Ni disorder is observed for x < 0.4. Highlights: ► LiCo{sub 0.4}Ni{sub 0.3}Mn{sub 0.3}O{sub 2} is a member of the LiCo{sub 1−2x}Ni{sub x}Mn{sub x}O{sub 2} solid solution. ► Structural refinement of this cathode material shows no Li/Ni disorder. ► The rhombohedral symmetry was preserved upon lithium removal. ► The discharge capacity reached more than 140 mAh/g at 2C rate and 160 mAh/g at 1C. -- Abstract: LiCo{sub 0.4}Ni{sub 0.3}Mn{sub 0.3}O{sub 2} layered oxide in a member of themore » LiCo{sub 1−2x}Ni{sub x}Mn{sub x}O{sub 2} solid solution between LiCoO{sub 2} and LiNi{sub 0.5}Mn{sub 0.5}O{sub 2}. Compositions from this solid solution have attracted much attention and have been extensively studied as promising cathode candidates to replace the most popular LiCoO{sub 2} cathode material used in the commercial lithium-ion batteries (LiBs). LiCo{sub 0.4}Ni{sub 0.3}Mn{sub 0.3}O{sub 2} positive electrode material was prepared via the combustion method followed by a thermal treatment at 900 °C for 12 h. This material was characterized by a high homogeneity and a granular shape. The Rietveld refinement evidenced that the structure of this compound exhibits no Ni/Li disorder revealing that the LiCo{sub 1−2x}Ni{sub x}Mn{sub x}O{sub 2} system presents the ideal structure for LiBs application when x < 0.4. The electrochemical performances of the LiCo{sub 0.4}Ni{sub 0.3}Mn{sub 0.3}O{sub 2} sample were measured at different current rates in the 2.7–4.5 V potential range. Its discharge capacity reached 178, 161 and 145 mAhg{sup −1} at C/20, 1C and 2C, respectively. Structural changes in LiCo{sub 0.4}Ni{sub 0.3}Mn{sub 0.3}O{sub 2} upon delithiation were studied using ex situ X-ray diffraction. A continuous solid solution with a rhombohedral symmetry was detected in the whole composition range. This structural stability during the cycling combined with the obtained electrochemical features make this material convenient for the LiBs applications.« less
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  • Highlights: • Synthesis of magnetic ceramic composites. • Magnetization of dual phase ceramics. • Magnetic entropy change in (0.95)La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/(0.05)Ni{sub 1−x}Zn{sub x}Fe{sub 2}O{sub 4} solid solution. - Abstract: We report the magnetic and magnetocaloric properties of (0.95)La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/(0.05)Ni{sub 1−x}Zn{sub x}Fe{sub 2}O{sub 4} (x = 0.0, 0.1, 0.3, and 0.5) ceramic composites. The composite samples with nominal compositions were prepared using the conventional solid-state reaction method. The phase purity and structure were confirmed by using X-ray diffraction. Temperature dependent magnetization measurements and Arrott analysis reveal second order of magnetic phase transition in the composite samples. A maximummore » in magnetic entropy change of ∼0.75 J/kg K at 1 T has been observed in (0.95)La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/(0.05)NiFe{sub 2}O{sub 4} sample. The values of magnetic entropy change of these composites make them attractive for potential applications. These composite samples may consider as potential material for magnetic refrigeration near room temperature.« less