Study of the high temperature characteristics of hydrogen storage alloys

Microstructure and electrochemical performance of vanadium-containing AB5-type low-Co intermetallic hydrides

“…It can be seen that the substitution of vanadium for Ni makes the peak (1 1 1) broaden. The (1 1 1) FWHM of all the melt-spun ribbons is narrower than that of the corresponding as-cast alloys, which is well agree with our previous work [19]. It means that the lattice strain and defects that is produced in the alloy during casting are reduced [23][24] by the melt-spinning technique.…”

“…Recently, our work [19] found that the high-temperature capacity and the recovery capacity after high temperature experiment could be promoted remarkably by addition of yttrium and melt-spinning technique, but the cyclic stability is not satisfied.…”

Effects of Al content on the electrochemical properties of La0.78Ce0.22Ni3.95-xCo0.65Mn0.3Si0.1Alx alloys at 20–80 °C

“…According to previous work [5,13], researchers found the high-temperature recoverability (HTR) after high-temperature cycle is of more important than the high-temperature properties itself. It is because the former one has a direct influence on the cycling life of the battery.…”

Improvement in high-temperature performance of Co-free high-Fe AB5-type hydrogen storage alloys

“…For the practice application of MH/Ni battery, the hightemperature recoverability (HTR) after high-temperature cycle is of greater importance than the high-temperature properties itself. It is because the HTR properties affect the cycling life of the battery [25]. HTR can be calculated using the following formula:…”

“…Hence, ICP-AES analysis of the alkaline electrolyte was carried out after the cycles. It was reported that any dissolution of ions of La, Ce in the electrolytes were hardly observed [25], so the ionic concentration (Ni, Co, Fe, Mn, Al) in the electrolyte of high-Co/high-Fe alloy after 150 cycles was detected in Table 3. Apparently, the dissolution of Fe in high-Fe alloy is significantly higher than that of Co in high-Co alloy.…”