The nickel-iron battery is a storage battery having a nickel(III) oxide-hydroxide cathode and an iron anode, with an electrolyte of potassium hydroxide. The active materials are held in nickel-plated steel tubes or perforated pockets. The nominal cell voltage is 1.2V. It is a very robust battery which is tolerant of abuse, (overcharge, overdischarge, short-circuiting and thermal shock) and can have very long life even if so treated. It is often used in backup situations where it can be continuously charged and can last for more than 20 years. Its use has declined due to low specific energy, poor charge retention, and poor low-temperature performance, and its high cost of manufacture compared with the lead-acid battery.
The ability of these batteries to survive frequent cycling is due to the low solubility of the reactants in the electrolyte. The formation of metallic iron during charge is slow because of the low solubility of the Fe3O4, which is good and bad. It is good because the slow formation of iron crystals preserves the electrodes, bad because it limits the high rate performance: these cells charge slowly, and are only able to discharge slowly.
Nickel-iron batteries have long been used in European mining operations because of their ability to withstand vibrations, high temperatures and other physical stress. They are being examined again for use in wind and solar power systems and for modern electric vehicle applications.
In many respects the Nickel/Iron battery was almost "too good." A battery that lasts for decades in many cases can outlast the equipment that it was originally designed to power. So from an economic standpoint lead acid, NiCd and other technologies have been deemed "good enough" and are the predominant technologies in use today even though they do not last as long as a Nickel/Iron counterpart.
and at the anode:
Edison's batteries were made from about 1903 to 1972 by the Edison Battery Storage Company located in East Orange, NJ. They were quite profitable for the company. In 1972 the battery company was sold to the Exide Battery Corporation which discontinued making the battery in 1975. Edison was disappointed that his battery was not adopted for starting internal combustion engines and that electric vehicles went out of production only a few years after his battery was introduced. He actually developed the battery to be the battery of choice for electric vehicles which he thought would be the preferred transportation mode in the early 1900's. The battery enjoyed wide use for railroad signaling, fork lift, and standby power applications. There are no Nickel Iron batteries manufactured in the Western world at this time (2007), but they are still manufactured in China.
Nickel-iron batteries do not have the lead or cadmium of the lead-acid and nickel-cadmium batteries, which makes them a lesser burden on human and ecological health. Lead is known to be toxic and to impair brain development and has been banned in many applications such as paint and as a gasoline additive. The disposal of lead batteries into landfills, some of which leak, is a persistent problem especially in countries without environmental laws or enforcement bodies.
ENERGY FAIR SHINES AGAIN THE RENEWABLE ENERGY AND SUSTAINABLE LIVINGFAIR HIGHLIGHTS NEW ENERGY USES.(Business)
Jun 17, 2000; Bob Voytasek was armed with a paper shopping bag full of brochures, as he left the Renewable Energy and Sustainable Living Fair...