1070-4272/05/7809-1430+2005 Pleiades Publishing, Inc.
Russian Journal of Applied Chemistry, Vol. 78, No. 9, 2005, pp. 1430 !1432. Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 9,
2005, pp. 1455!1457.
Original Russian Text Copyright + 2005 by Arkhangel’skaya, Demidov, Loginova, Kas’yan, Apollonova.
AND CORROSION PROTECTION OF METALS
Effect of Lanthanide Additives to a Nickel Oxide Electrode
of a Sealed Nickel!Zinc Battery on the Self-Discharge
and Hydrogen Pressure
Z. P. Arkhangel’skaya, A. I. Demidov, M. M. Loginova,
T. B. Kas’yan, and E. V. Apollonova
Rigel’ Open Joint-Stock Battery Company, St. Petersburg, Russia
St. Petersburg State Polytechnic University, St. Petersburg, Russia
Received March 16, 2005
Abstract-The influence exerted by addition of a nickel-based alloy containing lanthanides (La, Ce, Nd, Pr)
to the active paste of a nickel oxide electrode on the self-discharge and hydrogen pressure in a sealed nickel!
zinc battery was studied.
Proceeding with studies of gas evolution and gas
absorption in a sealed nickel3zinc (SNiZn) battery
with a nickel oxide electrode (NOE) made of spherical
nickel hydroxide , we examined the influence
exerted by addition of a nickel-based alloy containing
lanthanides (La, Ce, Nd, Pr) to the active paste of
a nickel3oxide electrode on the self-discharge and
hydrogen pressure in an SNiZn battery. Lanthanide
oxides were introduced into the active paste of an
NOE in order to raise the utilization coefficient of the
active paste in the NOE and improve its preservation
. Erbium, thulium, ytterbium, and lutetium oxides
were found to be the most effective additives at an
elevated temperature (75oC).
Nickel-based lanthanide-containing alloys exhibit a
high absorption capacity for hydrogen . The re-
placement of a cadmium electrode with an electrode
composed of a nickel alloy with lanthanides, which
can absorb hydrogen and desorb it upon polarity
reversal, gave rise to nickel3metal hydride batteries.
As the interaction of nickel metahydroxide NiOOH
with hydrogen is accompanied by reduction of the
nickel ion Ni
and oxidation of hydrogen
2NiOOH + H
the influence of lanthanides on the self-discharge
and hydrogen pressure in an SNiZn battery can be
evaluated by a decrease in the NOE capacity and a
change in the hydrogen pressure under cycling condi-
We introduced lanthanides into the active paste of
an NOE in an amount of 132 wt % in the form of
a nickel-based alloy containing La, Ce, Nd, and Pr.
The study was performed on SNiZn batteries of the
NTsG-25 type with an NOE composed of spherical
nickel hydroxide . The characteristics of the NOE
studied in the batteries are listed in Table 1.
We determined the rated capacity of NOE by
studying separate NOEs in prototype batteries. The
electrodes were formed in two to three cycles, with a
capacity equal to 1.1C
of the positive electrode im-
parted in the first cycle, and 1.4C
, in the second and
third cycles (C
is the thermodynamic capacity). The
zinc electrode contained 2 wt % CdO and 1 wt % PbO.
The open-circuit voltage U
of assembled bat-
teries and the potential of NOE relative to a mercury
Table 1. Characteristics of NOE in NTsG-25 nickel!zinc
³ Content of alloy additive, wt %/g
³ 0/0 ³ 0.5/1 ³ 1.0/2 ³ 2.0/4
Total amount of ³ 189 ³ 189 ³ 189 ³ 189
active paste, g ³³³³
Ni + Co content, g ³ 113 ³ 112 ³ 111 ³ 110
Capacity, A h: ³³³³
theoretical ³ 51 ³ 51 ³ 51 ³ 50
rated ³ 26 ³ 26 ³ 26 ³ 25