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Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK)

Changsha,China,10.16-10.18,2010

ISBN: 978-1-935068-41-9 Scientific Research Publishing, USA

E-Book 2313pp Pub. Date: October 2010

Category: Chemistry & Materials Science

Price: $360

Title: Effect of Synthesis Temperature on the Phase Structure and Electrochemical Performance of La-Mg-Ni Hydrogen Storage Alloys
Source: Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK) (pp 510-512)
Author(s): Bing-jie Jiang, Beijing Key Laboratory of Environmental Science and Engineering, School of Chemical Engineering & the Environment, Beijing Institute of Technology, Beijing 100081, China; Henan Province Energy Saving Monitor Center, HeNan Zhengzhou 450003, China
Dao-bin Mu, National Development Center of Hi-Tech Green Materials, Beijing 100081, China
Jing Wang, National Development Center of Hi-Tech Green Materials, Beijing 100081, China
Feng Wu, National Development Center of Hi-Tech Green Materials, Beijing 100081, China
Abstract: La0.7Mg0.3Ni2.8Co0.6Al0.1 hydrogen storage alloys was prepared by solid diffusion reaction under argon atmosphere. The effect of synthesis temperature was studied. The phase structure and electrochemical performance of these alloys were investigated by means of XRD Rietveld method and electrochemical testing. It was shown that all these alloys were consisted of LaNi5，La2Ni7 and LaNi3 phases. Synthesis temperature had obvious effect on the alloy. When the temperature was too low, more unkonwn phase exsited because that the elements diffusion was insufficient. And when the temperature was too high, the burn out rate of Mg element increased so that the discharge capacity decreased. When the synthesis temperature was 900℃, the alloy showed the best electrochemical performance, whose maximum discharge capacity was 373.1mAh/g.
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