Structural and electrochemical properties of high-capacity Ml-Mg-Ni-based hydrogen storage alloys

doi:10.1007/s11458-009-0007-x

Front Chem Chin

2009, Vol. 4

Issue (1) : 48-51 https://doi.org/10.1007/s11458-009-0007-x

RESEARCH ARTICLE

Structural and electrochemical properties of high-capacity Ml-Mg-Ni-based hydrogen storage alloys

Shumin HAN^1,2(

), Yuan LI¹, Zhong ZHANG², Xilin ZHU¹, Jinhua LI², Lin HU¹

1. School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China; 2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China

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Abstract

The Ml-Mg-Ni-based (Ml= La-rich mixed lanthanide) hydrogen storage alloy Ml_0.88Mg_0.12Ni_3.0Mn_0.10Co_0.55Al_0.10 was prepared by inductive melting. The micro-structure was analyzed by XRD and SEM. The alloy consists mainly of CaCu₅-type phase, Ce₂Ni₇-type phase and Pr₅Co₁₉-type phase. The electrochemical measurements show that the maximum discharge capacity is 386 mAh/g, 16.3% higher than that of the commercial AB₅-type alloy (332 mAh/g). At discharge current density of 1 100 mA/g, high rate dischargeability is 62%, while that of the AB₅-type alloy is only 45%. The discharge capacity decreases to 315 mAh/g after 300 charge/ discharge cycles, 81.5% of the maximum discharge capacity.

Keywords Ni/MH batteries hydrogen storage alloys Ml-Mg-Ni-based alloys electrochemical properties

Corresponding Author(s): HAN Shumin,Email:hanshm@ysu.edu.cn

Issue Date: 05 March 2009

Cite this article:

Shumin HAN,Yuan LI,Zhong ZHANG, et al. Structural and electrochemical properties of high-capacity Ml-Mg-Ni-based hydrogen storage alloys[J]. Front Chem Chin, 2009, 4(1): 48-51.

URL:

https://academic.hep.com.cn/fcc/EN/10.1007/s11458-009-0007-x
https://academic.hep.com.cn/fcc/EN/Y2009/V4/I1/48

Tab.1 Chemical compositions of MlMgNiMnCoAl alloy%

Fig.1 XRD patterns of MlMgNiMnCoAl () and AB alloy ()

Fig.2 Back scattering electron image of MlMgNiMnCoAl alloy

Fig.3 Capacities varying with cycle numbers for MlMgNiMnCoAl () and AB () alloy electrodes

Fig.4 HRD of MlMgNiMnCoAl () and AB () alloy electrodes

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