Effect of Ball Milling on the Electrochemical Properties of La0.7(Mg0.25Ti0.05)(Ni0.85Co0.15)3.5 Hydrogen Storage Alloy

DOI

10.2991/ism3e-15.2015.5How to use a DOI?

Abstract

The influence of ball milling on the structure and the electrochemical properties of La0.7(Mg0.25Ti0.05)(Ni0.85Co0.15)3.5 hydrogen storage alloy was investigated systematically. The XRD results show that the main phases of the alloy are a (LaMg)Ni3 phase with the PuNi3-type rhombohedral structure and a LaNi5 phase with the CaCu5-type hexagonal structure. The electrochemical studies show that the maximum discharge capacity and the high rate dischargeability decrease with the increase of milling time. Furthermore, the exchange current density first increases and then decreases with the increase of milling time from 0 (as-cast) to 120 min, consistent with the variation of the charge-transfer resistance from the electrochemical impedance spectra. However, the limiting current density first decreases from 2472.8 mA/g (as-cast) to 1719.6 mA/g (BM 30 min) and then increases to 2360.4 mA/g (BM 120 min).

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Shujun Qiu
AU  - Xingyu Ma
AU  - Errui Wang
AU  - Jianling Huang
AU  - Hailiang Chu
AU  - Yongjin Zou
AU  - Cuili Xiang
AU  - Fen Xu
AU  - Lixian Sun
PY  - 2015/11
DA  - 2015/11
TI  - Effect of Ball Milling on the Electrochemical Properties of La0.7(Mg0.25Ti0.05)(Ni0.85Co0.15)3.5 Hydrogen Storage Alloy
BT  - Proceedings of the 2015 International Symposium on Material, Energy and Environment Engineering
PB  - Atlantis Press
SP  - 16
EP  - 19
SN  - 2352-5401
UR  - https://doi.org/10.2991/ism3e-15.2015.5
DO  - 10.2991/ism3e-15.2015.5
ID  - Qiu2015/11
ER  -