Effect of Milling Time on Microstructures and Electrochemical Properties of AB_3.5-Type La-Mg-Ni-Co-Al Hydrogen Storage Alloys

Abstract:

La_0.70Mg_0.30Ni_2.45Co_0.75Al_0.30 alloys were synthesized by milling and blending of the La_0.70Ni_2.45Co_0.75Al_0.30 pre-alloy prepared by melting and elemental Mg, followed by annealing. The effects of milling time on the microstructures and electrochemical properties of the La_0.70Mg_0.30Ni_2.45Co_0.75Al_0.30 hydrogen storage alloys were investigated. The structure, microstructure and electrochemical properties of the alloys were investigated by XRD, SEM and electrochemical measurements. The results showed that a noticeable (La,Mg)₂Ni₇ phase can be observed in the alloy milled for 2 h. Moreover, the distribution of the Mg element in the alloy milled for 15 h presents some aggregation phenomena. The La_0.70Mg_0.30Ni_2.45Co_0.75Al_0.30 alloy milled for 2 h exhibits the best maximum discharge capacity (313.5 mAh/g) and discharge potential characteristic. The cyclic stability of the as-cast La_0.70Ni_2.45Co_0.75Al_0.30 alloy is better than that of the milled La_0.70Mg_0.30Ni_2.45Co_0.75Al_0.30 alloy.

• Periodical: Solid State Phenomena (Volume 288)
• Pages: 9-16
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.288.9
• Online since: March 2019
• Authors: Xiao Tian*, Wei Wei, Jing Yan, Xin Zhang, Zhan Quan Yao, Xin Xin Wan, Ojiyed Tegus
• Keywords: Electrochemical Property, High Energy Ball-Milling, Hydrogen Storage Alloy, La-Mg-Ni-Based Alloy

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