Optimization of LaNi5 hydrogen storage properties by the combination of mechanical alloying and element substitution
Résumé
LaNi5 is a commercial hydrogen storage alloy with great potential.
But its performance still needs to be optimized to meet the
standard proposed by the US Department of Energy. Element
substitution is a very important method to optimize the performance
of hydrogen storage alloys, especially suitable for AB5 alloys. As
a novel method to produce nanocrystalline hydrogen storage alloys,
mechanical alloying is also often applied to optimize the
properties of hydrogen storage alloys. In this work, first of all,
the simulation method based on first principles is applied to
predict the performance of 8 elements substituting Ni respectively,
and select the most suitable element to substitute Ni. Then the
phase composition characterization, hydrogen storage performance
tests and electrochemical performance tests were carried out. It
was found that mechanical alloying can greatly improve the hydrogen
storage performance of LaNi5, and different ball milling times can
bring about different performance changes. After adding Cr to the
ballmilled LaNi5, the properties of the formed LaNi4Cr were further
improved.
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