Abstract
A crystalline Ti2Ni alloy was mechanically milled and subsequently annealed to form a non-equilibrium Ti2Ni alloy. This non-equilibrium structure could restrain the formation of irreversible metal hydride during charging. Consequently, we demonstrated that the alloy had a discharge capacity of 336 mAh g−1, which was much higher than those of other Ti2Ni alloys reported in the literature and also higher than that of the commercial LaNi5–based alloy. An electrochemical hydrogen absorption–desorption mechanism of the alloy during cycling is also presented.
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