Res. Chem. Intermed.
, Vol. 32, No. 5–6, pp. 473–481 (2006)
Also available online - www.vsppub.com
Solid-state metal hydride batteries using ZrO
as an electrolyte
, KEISUKE HATAKEYAMA
, MIKIO FUJII
, CHIAKI IWAKURA
and TAKAO ESAKA
Department of Materials Science, Faculty of Engineering, Tottori University, Minami 4-101,
Koyamacho, Tottori 680-0945, Japan
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University,
1-1, Gakuencho, Sakai, Osaka 599-8531, Japan
Received 17 December 2004; accepted 25 January 2005
O–KOH composite was used as an electrolyte in order
to develop a solid-state nickel–metal hydride battery. The battery using the ZrO
composite had rechargeability, but had a very low discharge efﬁciency, even at low current density.
However, the performance of the battery was prominently improved by enlarging the electrode–
electrolyte interface area. The resultant battery exhibited the remarkably longer cycle life, the higher
discharge efﬁciency, and the lower polarization: it was able to operate over 150 cycles at 10 mA/g
Keywords: Ni-MH battery; ZrO
O; solid-state battery; solid electrolyte.
Recently, development of the portable electric devices has made rapid progress.
Rechargeable batteries, such as nickel–metal hydride (Ni-MH) batteries and lithium
ion batteries, have mainly been used as a power supply for the devices. The demand
for performance on the batteries has diversiﬁed as the devices have advanced. Solid-
state batteries using a variety of solid electrolytes have become of interest in recent
years, since they often have some advantages in terms of reliability, safety and cell
designing compared with the battery using the conventional liquid electrolyte. For
example, if a solid electrolyte is used, a separator should be unnecessary in a battery
because the electrolyte plays a role as a separator. The Ni-MH battery is well-
known as a major secondary battery with high performance, such as a high rate
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