Search Defense Update:
Energy density is the most significant factor in
secondary (rechargeable) battery consideration, but other
important attributes are service life, load characteristics,
maintenance requirements, self-discharge and operational costs.
-Nickel-cadmium – (NiCd) mature but has moderate energy
density. Nickel-cadmium is used where long life, high discharge
rate and extended temperature range is important. Main
applications are two-way radios, biomedical equipment and power
tools. Environmental considerations are also important in this
category, as nickel-cadmium contains toxic metals that must be
disposed of properly.
-Nickel-metal-hydride (NiMH)- has a higher energy density
compared to nickel-cadmium at the expense of reduced cycle life.
There are no toxic metals. Applications include mobile phones and
-Lithium-ion – (Li-ion) fastest growing battery system;
offers high-energy density and low weight. Protection circuits are
needed to limit voltage and current for safety reasons.
Applications include notebook computers and cell phones. New
electrode provide x5 more power and x10 longer cycle life at
20% of the weight.
-Lithium-ion-polymer - Similar to lithium-ion, this system
enables slim geometry and simple packaging at the expense of
higher cost per watt/hours. Main applications are cell phones.
Powering the Land Warrior
Battery Logistics in Iraq 2003