快淬对MlNi3.55Co0.75Mn0.4Al0.3/5wt% Mg2Ni复合储氢合金电化学性能的影响

doi:10.3724/SP.J.1077.2012.12052

无机材料学报 ›› 2012, Vol. 27 ›› Issue (11): 1179-1184.DOI: 10.3724/SP.J.1077.2012.12052 CSTR: 32189.14.SP.J.1077.2012.12052

快淬对MlNi_3.55Co_0.75Mn_0.4Al_0.3/5wt% Mg₂Ni复合储氢合金电化学性能的影响

田晓¹, 特古斯¹, 海山¹, 姚占全²

(1.内蒙古师范大学物理与电子信息学院, 功能材料物理与化学自治区重点实验室, 呼和浩特 010022; 2.内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018)

收稿日期:2012-01-18 修回日期:2012-04-26 出版日期:2012-11-20 网络出版日期:2012-10-25
基金资助:
内蒙古自然科学基金(2010MS0804); 内蒙古自治区高等学校科学研究基金(NJZY11036); 内蒙古师范大学科研基金(ZRYB09007); 国家自然科学基金(10947008)

Effects of Rapid Quenching on Electrochemical Properties of MlNi_3.55Co_0.75Mn_0.4Al_0.3/5wt% Mg₂Ni Composite Hydrogen Storage Alloy

TIAN Xiao¹, Tegus O¹, HAI Shan¹, YAO Zhan-Quan²

(1. Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, School of Physics and Electronic Information, Inner Mongolia Normal University, Huhhot 010022, China; 2. School of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Huhhot 010018, China)

Received:2012-01-18 Revised:2012-04-26 Published:2012-11-20 Online:2012-10-25
Supported by:
Natural Science Foundation of Inner Mongolia Autonomous Region (2010MS0804); Science Research Foundation of the Higher Education Institutions of Inner Mongolia Autonomous Region (NJZY11036); Science Research Foundation of Inner Mongolia Normal University (ZRYB09007); National Natural Science Foundation of China (10947008)

摘要/Abstract

摘要： 为了改善AB₅型储氢合金的放电容量和循环稳定性, 研究了快淬速度对MlNi_3.55Co_0.75Mn_0.4Al_0.3/5wt% Mg₂Ni复合储氢合金结构和电化学性能的影响. 电感耦合等离子发射光谱(ICP)、X 射线衍射(XRD)、扫描电镜(SEM/EDS)和透射电子显微镜(TEM)分析表明, 铸态复合合金由LaNi₅相和少量的Mg₂Ni相组成, 而快淬态复合合金却由(La,Mg)Ni₃新相和LaNi₅相组成. 当快淬速度≥15 m/s时, 复合合金中形成明显的纳米晶组织并伴有部分非晶化倾向. 电化学性能测试表明, 快淬态复合合金的最大放电容量和容量保持率随快淬速度的增大呈现出先增大后减少的变化规律, 其中快淬速度为20 m/s时合金电极的最大放电容量达最大值344 mAh/g, 经100次充放电循环后该电极的容量保持率为93.9%.

关键词: 快淬, 复合储氢合金, 微结构, 电化学性能

Abstract: In order to improve the discharge capacity and the cycling stability of AB₅-type hydrogen storage alloy, the effects of rapid quenching rate on the microstructures and electrochemical properties of MlNi_3.55Co_0.75Mn_0.4Al_0.3/5wt% Mg₂Ni composite alloy were investigated by means of inductively coupled plasma (ICP), X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometry (EDS), transmission electron microscope (TEM) and electrochemical measurements. The results show that the as-cast composite alloy is composed of the LaNi₅ phase and a small amount of the Mg₂Ni phase. However, the quenched composite alloys consist of the (La,Mg)Ni₃ new phase and the LaNi5 phase. When the rapid quenching rate is higher than 15 m/s, nanocrystalline structure are formed and partial amorphous structure appeares in the composite alloys. Electrochemical studies show that the maximum discharge capacity and the capacity retention of quenched composite alloys increase firstly and then decrease with increasing rapid quenching rate. The maximum discharge capacity and the capacity retention after 100 cycles of the quenched composite alloy at 20 m/s is up to 344 mAh/g and 93.9%, respectively.

Key words: rapid quenching, composite hydrogen storage alloy, microstructure, electrochemical properties

中图分类号:

TG139

田晓, 特古斯, 海山, 姚占全. 快淬对MlNi_3.55Co_0.75Mn_0.4Al_0.3/5wt% Mg₂Ni复合储氢合金电化学性能的影响[J]. 无机材料学报, 2012, 27(11): 1179-1184.

TIAN Xiao, Tegus O, HAI Shan, YAO Zhan-Quan. Effects of Rapid Quenching on Electrochemical Properties of MlNi_3.55Co_0.75Mn_0.4Al_0.3/5wt% Mg₂Ni Composite Hydrogen Storage Alloy[J]. Journal of Inorganic Materials, 2012, 27(11): 1179-1184.

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快淬对MlNi_3.55Co_0.75Mn_0.4Al_0.3/5wt% Mg₂Ni复合储氢合金电化学性能的影响

Effects of Rapid Quenching on Electrochemical Properties of MlNi_3.55Co_0.75Mn_0.4Al_0.3/5wt% Mg₂Ni Composite Hydrogen Storage Alloy

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