Structure and Electrochemical Properties of La0.6R0.2Mg0.2（NiCoAlMn）3.3 Hydrogen Storage Alloys

Zou Xinwei; Zhang Mingang; Sun Gang

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Structure and Electrochemical Properties of La_0.6R_0.2Mg_0.2（NiCoAlMn）_3.3 Hydrogen Storage Alloys
Vol. 31, Issue 3, Pages: 255-259(2011)
Published： 2011 ，
DOI：

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[1]邹欣伟,张敏刚,孙钢.稀土对La_(0.6)R_(0.2)Mg_(0.2)(NiCoAlMn)_(3.3)储氢合金相结构和电化学性能的影响[J].特种铸造及有色合金,2011,31(03):255-259+193.

Zou Xinwei, Zhang Mingang, Sun Gang. Structure and Electrochemical Properties of La_0.6R_0.2Mg_0.2（NiCoAlMn）_3.3 Hydrogen Storage Alloys. [J]. Special Casting & Nonferrous Alloys 31(3):255-259(2011)
[1]邹欣伟,张敏刚,孙钢.稀土对La_(0.6)R_(0.2)Mg_(0.2)(NiCoAlMn)_(3.3)储氢合金相结构和电化学性能的影响[J].特种铸造及有色合金,2011,31(03):255-259+193. DOI：

Zou Xinwei, Zhang Mingang, Sun Gang. Structure and Electrochemical Properties of La_0.6R_0.2Mg_0.2（NiCoAlMn）_3.3 Hydrogen Storage Alloys. [J]. Special Casting & Nonferrous Alloys 31(3):255-259(2011) DOI：

摘要

以La0.6R0.2Mg0.2Ni2.8Co0.2Al0.2Mn0.1（R=La、Ce、Pr、Nd、Y）合金为研究对象

研究稀土元素R部分替代La后对合金相结构和相组成及电化学性能的影响。X射线衍射（XRD）和显微电子探针（EPMA）方法分析结果表明

合金La0.8Mg0.2Ni2.8Co0.2Al0.2Mn0.1退火组织主要由Ce2Ni7型相（或Gd2Co7型）、PuNi3型相和CaCu5型相组成;Pr、Ce、Nd元素的替代对合金的相组成没有明显影响

而Y元素替代使合金中CaCu5型相明显减少

Ce2Ni7型（或Gd2Co7型）相显著增加

其相丰度达到79.03%。Y元素替代时合金中Gd2Co7型相基本消失。电化学测试和分析表明

稀土元素R替代La后对合金电极活化性能影响不大

其中Pr、Nd、Y部分替代La在一定程度上提高了合金的最大放电容量

而元素Y替代时合金电极容量最高达到392.6mAh/g;Y元素部分替代La使合金电极的循环稳定性得到明显提高

S100达到90.3%。

Abstract

La0.6R0.2Mg0.2（NiCoAlMn）3.3 hydrogen storage alloys were prepared by induction melting and then treated by annealing process

and effects of rare earth R （R is La

Nd and Y） substituted for La on the structure and electro-chemical properties were investigated by XRD （X-ray diffraction） and EPMA. The results reveal that the La0.6R0.2Mg0.2（NiCoAlMn）3.3 hydrogen storage alloys consist of CaCu5-type phase as matrix and Ce2Ni7 and PuNi3-type as secondary phase. Addition of Ce

Nd is not changed the phase constituent of the alloy. However

CaCu5-type phase is decreased and Ce2Ni7-type phase is increased obviously with Y addition

and phase abundance of Ce2Ni7-type phase reaches 79.03%

meanwhile

Y addition can lead to the disappearance of Gd2Co7-type phase. Electrochemical measurements show that activation performance of the alloy is slightly affected by the Ce

Nd and Y element

however

maximum discharge capacities of the alloy are improved to some extent with Pr

Y substituted for La partially

in which maximum discharge capacity reaches up to 392.6 mAg/g with Y. In addition

cyclic stability of the alloys with Y substituted for La is increased obviously

increased by 90.3%.