NDLI: An investigation on electrochemical performances of as-cast and annealed La$_{0.8}$Mg$_{0.2}$Ni$_{3.3}$Co$_{0.2}$Si$_{ x }$ (x = 0–0.2) alloy electrodes for Ni/MH battery application

Content Provider	Springer Nature Link
Author	Zhang, Yang huan Chen, Li cui Zhao, Chen Yang, Tai Xu, Chao Zhao, Dong liang
Copyright Year	2014
Abstract	The La-Mg-Ni-based A$_{2}$B$_{7}$-type La$_{0.8}$Mg$_{0.2}$Ni$_{3.3}$Co$_{0.2}$Si$_{ x }$ (x=0–0.2) electrode alloys were prepared by casting and annealing. The influences of the additional silicon and the annealing treatment on the structure and electrochemical performances of the alloys were investigated systemically. Both of the analyses of XRD and SEM reveal that the as-cast and annealed alloys are of a multiphase structure, involving two main phases (La, Mg)$_{2}$Ni$_{7}$ and LaNi$_{5}$ as well as one minor phase LaNi$_{3}$. The addition of Si and annealing treatment bring on an evident change in the phase abundances and cell parameters of (La, Mg)$_{2}$Ni$_{7}$ and LaNi$_{5}$ phase for the alloy without altering its phase structure. The phase abundances decrease from 74.3% (x=0) to 57.8% (x=0.2) for the (La, Mg)$_{2}$Ni$_{7}$ phase, and those of LaNi5 phase increase from 20.2% (x=0) to 37.3% (x=0.2). As for the electrochemical measurements, adding Si and performing annealing treatment have engendered obvious impacts. The cycle stability of the alloys is improved dramatically, being enhanced from 80.3% to 93.7% for the as-annealed (950 °C) alloys with Si content increasing from 0 to 0.2. However, the discharge capacity is reduced by adding Si, from 399.4 to 345.3 mA·h/g as the Si content increases from 0 to 0.2. Furthermore, such addition makes the electrochemical kinetic properties of the alloy electrodes first increase and then decrease. Also, it is found that the overall electrochemical properties of the alloys first augment and then fall with the annealing temperature rising.
Starting Page	2125
Ending Page	2135
Page Count	11
File Format	PDF
ISSN	20952899
Journal	Journal of Central South University of Technology
Volume Number	21
Issue Number	6
e-ISSN	22275223
Language	English
Publisher	Central South University
Publisher Date	2014-06-14
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	A$_{2}$B$_{7}$-type electrode alloy adding Si annealing treatment structure electrochemical performances Engineering Metallic Materials
Content Type	Text
Resource Type	Article
Subject	Metals and Alloys Engineering

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