Phase Structure and Electrochemical Properties of La0.83Mg0.17Ni3.25Al0.15Mn0.1 Hydrogen Storage Alloys Prepared by Melt Spun

Zou Xinwei1; Yang Xiaofeng2; Zhang Mingang1

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Phase Structure and Electrochemical Properties of La_0.83Mg_0.17Ni_3.25Al_0.15Mn_0.1 Hydrogen Storage Alloys Prepared by Melt Spun
Vol. 30, Issue 12, Pages: 1153-1156(2010)
Published： 2010 ，
DOI：

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[1]邹欣伟,杨晓峰,张敏刚.快速凝固制备La_(0.83)Mg_(0.17)Ni_(3.25)Al_(0.15)Mn_(0.1)储氢合金的相结构和电化学性能[J].特种铸造及有色合金,2010,30(12):1153-1156+1076-1077.

Zou Xinwei1, Yang Xiaofeng2, Zhang Mingang1. Phase Structure and Electrochemical Properties of La_0.83Mg_0.17Ni_3.25Al_0.15Mn_0.1 Hydrogen Storage Alloys Prepared by Melt Spun. [J]. Special Casting & Nonferrous Alloys 30(12):1153-1156(2010)
[1]邹欣伟,杨晓峰,张敏刚.快速凝固制备La_(0.83)Mg_(0.17)Ni_(3.25)Al_(0.15)Mn_(0.1)储氢合金的相结构和电化学性能[J].特种铸造及有色合金,2010,30(12):1153-1156+1076-1077. DOI：

Zou Xinwei1, Yang Xiaofeng2, Zhang Mingang1. Phase Structure and Electrochemical Properties of La_0.83Mg_0.17Ni_3.25Al_0.15Mn_0.1 Hydrogen Storage Alloys Prepared by Melt Spun. [J]. Special Casting & Nonferrous Alloys 30(12):1153-1156(2010) DOI：

摘要

采用感应熔铸+退火处理（常规冷速）及快速凝固方法制备了La0.83Mg0.17Ni3.25Al0.15Mn0.1储氢合金。系统研究了快速凝固对合金的相结构、微观组织及电化学性能的影响。X射线衍射分析表明

冷却速率对合金的相组成影响不大

但对各相丰度影响明显。随着冷却速率的增加

合金中的LaNi5相（CaCu5型结构）丰度增加

LaNi3相（PuNi3型结构）丰度减少。EPMA分析表明

快速凝固方法制备的La0.83Mg0.17Ni3.25Al0.15Mn0.1储氢合金为扁平状晶粒组织。合金电极的电化学测试表明

冷却速率对合金的活化性能影响不大。随冷速的增加

合金的最大放电容量减小

合金电极的循环稳定性改善明显

铜辊线速度为15m/s时容量保持率达到97.03%。

Abstract

Hydrogen storage alloys La0.83Mg0.1Ni3.25Al0.15Mn0.1 was prepared by induction melting and annealing and by melt spun. Effects of melt spun on the phase structure

microstructure and electrochemical properties of the alloy were investigated by XRD （X-ray diffraction）

EPMA and electrochemical testing. The results reveal that

although effect of cooling rate on phase constituent in the alloy can be neglected

it greatly affected the abundance of different phases. With increasing in cooling rate

abundance of LaNi5 with CaCu5 type structure is increased

while abundance of LaNi3 phase with PuNi3 type structure is decreased. The microstructure of alloy prepared by melt spun is composed of columnar grain structure. In addition

activity of the alloy is almost independent of cooling rate. With increasing in cooling rate

maximum discharge capacity is decreased and cycling stability of the alloy is obviously improved

where S100 reaches 97.03% with cooling rate of 15 m/s.

关键词

快速凝固La0.83Mg0.17Ni3.25Al0.15Mn0.1储氢合金相结构电化学性能

Keywords

Melt SpunLa0.83Mg0.1Ni3.25Al0.15Mn0.1 Hydrogen Storage AlloysPhase StructureElectrochemical Properties

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