Page 286 - Handbook of Battery Materials

256 9 Metal Hydride Electrodes

Table 9.5 Effect of Ce in La 1−x Ce x Ni 3.55 Co .75 Mn .4 Al .3 electrodes [42].

x value V H n, H atoms %∆V/V Q max Corrosion
3
−1
( ˚ A /atom) per unit cell (mAh g ) (wt%/cycle)
1.0 1.6 a 0.8 1.4625 51 0
0.75 3.15 3.8 13.919 241 0.003
0.5 3.15 4.4 15.917 278 0.04
0.20 3.21 4.8 17.534 305 0.042
0.20 3.21 4.6 16.547 293 0.047
0.50 3.15 4.0 14.634 260 0.054
0.20 3.21 4.6 16.659 293 0.051
0.20 3.21 5.0 18.122 318 0.057
0.35 3.24 5.0 18.376 318 0.057
0.20 3.21 5.0 18.112 318 0.066
0.0 2.99 b 4.8 15.96 305 0.15
0.0 2.99 b 5.2 17.33 331 0.139
0.0 2.99 b 5.1 17.002 325 0.145
c
LaNi 4.7 Al .3 3.47 4.5 17.943 285 0.291
a α phase.
b Average.
c Included for comparison.

20 6
%expansion
%corroded 0.15
H content
15
0.10 4
∆V/V% 10 Wt. % Corroded/cycle n, H content

0.05 2

5
0.00

0 0
0.0 0.2 0.4 0.6 0.8 1.0
x in La 1-x Ce x Ni 3.55 Co .75 Mn .4 Al .3
Figure 9.12 % V/V, wt % corroded/cycle, and H content
vs Ce content, x,in La 1−x Ce x Ni 3.55 Co .75 Mn .4 Al .3 electrodes
[42].