- Tytuł:
- The Electronic and Electrochemical Properties of the $LaNi_5$-Based Alloys
- Autorzy:
-
Szajek, A.
Jezierski, A.
Nowak, M.
Jurczyk, M. - Powiązania:
- https://bibliotekanauki.pl/articles/1810498.pdf
- Data publikacji:
- 2009-01
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
71.20.-b
81.20.Ev - Opis:
- Mechanical alloying was used to synthesize $LaNi_5$-type hydrogen storage materials. X-ray diffraction analysis showed that, after 30 h milling, the starting mixture of the elements was decomposed into an amorphous phase. Following the annealing in high purity argon at 700°C for 0.5 h, X-ray diffraction confirmed the formation of the $CaCu_5$-type structures. The nanocrystalline materials were used as negative electrodes for a $Ni-MH_x$ battery. A partial substitution o Ni by Al or Mn in $LaNi_{5-x}M_x$ alloy leads to an increase in discharge capacity. On the other hand, the alloying elements such as Al, Mn and Co greatly improved the cycle life of $LaNi_5$ material. For example, in the nanocrystalline $LaNi_{3.75}Mn_{0.75}Al_{0.25}Co_{0.25}$ powder, discharge capacities of up to 258 mA h $g^{-1}$ (at 40 mA $g^{-1}$ discharge current) were measured. The band structure ab initio calculations showed that 3g sites are preferred by Al, Co, and Mn atoms in the unit cell.
- Źródło:
-
Acta Physica Polonica A; 2009, 115, 1; 247-250
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł