Surface Fluorination Treatment of AB3-type Mm0.78Mg0.22Ni2.48Mn0.09Al0.23Co0.47 Hydrogen Storage Alloys

LI Guo-hui; HUANG Hong-xia; WANG Xin-ying; LI Yin

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Surface Technology ›› 2014, Vol. 43 ›› Issue (5) : 76-80.

Applied Technology

Surface Fluorination Treatment of AB₃-type Mm_0.78Mg_0.22Ni_2.48Mn_0.09Al_0.23Co_0.47 Hydrogen Storage Alloys

LI Guo-hui, HUANG Hong-xia, WANG Xin-ying, LI Yin

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Abstract

Objective To improve the electrochemical properties of AB₃-type hydrogen storage alloy. Methods The AB₃ -type Mm_0.78Mg_0.22Ni_2.48Mn_0.09Al_0.23 Co_0.47( Mm consisted of 82. 3% La and 17. 7% Nd) alloy was modified by a solution consisting of HF and NaF. The effects of surface treatment on the phase structure, electrochemical properties and kinetic properties of the alloy were systematically investigated. Results XRD results showed that MgF2 was formed on the surface of the alloy particles after fluorination treatment. The maximum discharge capacity was enhanced and the capacity retention rate C50 /Cmax increased from the original 83. 3% to 92. 8% . Furthermore, the kinetic properties of the alloy electrode were also improved. Conclusion The phase structure of the alloy was changed after fluorination treatment, and the electrochemical properties of the alloy were improved.

Key words

hydrogen storage alloy; fluorination treatment; surface modification; electrochemical properties

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LI Guo-hui, HUANG Hong-xia, WANG Xin-ying, LI Yin. Surface Fluorination Treatment of AB₃-type Mm_0.78Mg_0.22Ni_2.48Mn_0.09Al_0.23Co_0.47 Hydrogen Storage Alloys[J]. Surface Technology. 2014, 43(5): 76-80

Funding

Supported by the National Nature Science Foundation of China ( 11364013 ) , the Education Department and Scientific Foundation of Guangxi ( 201203YB088) , the Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment Foundation of Guilin University of Technology ( KH2012YB002) , and the Students’ Innovative and Undertaking Projects of Guangxi ( 2013HSCX002)