Microstructure and Electrochemical Properties of La0.7Mg0.3(Ni1-xCox)3.5(x=0.0-0.2) Type Hydrogen Storage Alloy

Xiao Yun Zhao

doi:10.4028/www.scientific.net/AMM.365-366.1198

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 365-366Microstructure and Electrochemical Properties of...

Microstructure and Electrochemical Properties of La_0.7Mg_0.3(Ni_1-xCo_x)_3.5(x=0.0-0.2) Type Hydrogen Storage Alloy

Abstract:

La_0.7Mg_0.3(Ni_1-xCo_x)_3.5 (x=0.0-0.2) type hydrogen storage alloy was prepared. In order to optimizing the content of Co it was studied effects that Co replaced Ni on the structure and electrochemical properties of La_0.7Mg_0.3(Ni_1-xCo_x)_3.5(x=0.0-0.2) type hydrogen storage alloy X-ray diffraction (XRD) analyses showed that the alloys were composed of the LaNi5 phase with the CaCu5-type structure and the (La,Mg)₂Ni₇ phase with the Ce₂Ni₇-type structure. The maximum electrochemical discharge capacity increases with the increase of Co content. Moreover, the cycle stabilities of La_0.7Mg_0.3(Ni_1-xCo_x)_3.5 was improved remarkably by small quantity replacement Ni by Co, after 250 times, the discharge capacity was increased from 30% (x=0.0) to 65% (x=0.20).

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Periodical:

Applied Mechanics and Materials (Volumes 365-366)

Pages:

1198-1202

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.365-366.1198

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Online since:

August 2013

Authors:

Xiao Yun Zhao

Keywords:

Electrochemical Property, La-Mg-Ni Hydrogen Storage Alloy, Microstructure, Superlattice

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