Effect of ball milling and Ni alloying on the structure and properties of Mg23.5Y0.5Ni10Cu2 hydrogen storage alloy
As-milled hydrogen storage material was prepared from the as-cast Mg23.5Y0.5Ni10Cu2 alloy by ball milling and Ni alloying.The effects of ball milling time and nickel alloying on the microstructure and properties of the alloy were investigated.The results show that with the extension of milling time,the alloy gradually becomes nanocrystalline,and the composite nickel intensifies the amorphous nanocrystalline transformation of the alloy.The electrochemical performance test shows that the specific discharge capacity of the alloy is improved by ball milling,and the specific discharge capacity after 30 hour's ball milling is 1.29 times of that of 10 hour's.The specific discharge capacity and cycle stability of the alloy can be significantly improved with the help of composite nickel.The specific discharge capacity of composite nickel reached 767.20 mAh/g after ball milling for 30 hours,and it is 4.63 times of that of uncompos-ite nickel.Also the electrochemical dynamic performance of the alloy can be significantly improved by the composite nickel.
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