A NICKEL METAL HYDRIDE BATTERY FOR ELECTRIC VEHICLES

A detailed Summary of A NICKEL METAL HYDRIDE BATTERY FOR ELECTRIC VEHICLES


Electric vehicles can benefit us in many ways. Comparing with the internal combustion engine, EVs don't cause pollution when operating. They can run in a long period of time. Economically, because these vehicles using battery, they reduce the oil import and the imbalance trading in the US and also the users save a lot of money. The cells used for these vehicles are called Nickel metal hydride battery which are very high power, long life, quick charge and easy to maintain.

The NiMH battery stores hydrogen as a reaction product in the solid phase. The anode electrode contain hydrogen material that can allow electrochemical storage and release of hydrogen during charge and discharge. The cathode electrode is reversible between Ni(OH)2 and nickel oxyhydroxide (NiOOH). At both electrode, oxidation-reduction reactions take place in an alkaline medium consisting of 30% by weight KOH in water. When charging, Ni(OH)2 at the positive electrode b


Because the NiMH battery need to store a large amount of hydrogen to produce high energy, it is desirable to have high electrode capacity. Importantly, in the desire of MH, the range of metal to hydrogen bond strengths must be from 6 to 12 kcal /mol. If the bond strength is too weak, hydrogen will not react with the alloys and will be evaporate as a gas. If the bond strength is too large, the MH electrode becomes oxidized and does not store hydrogen reversibly. Furthermore, the power output of the battery depend on the electrochemical kinetics and transport processes which are involved in the use of the hydride material. During discharge, hydrogen in the bulk metal go through the surface by diffusion to react with hydroxyl ions at the metal electrolyte interface, the surface porosity, the oxide thickness, electrical conductivity, topology and surface areas affect the rate at which energy can be stored in and removed from the NiMH battery. In a sealed system, a

Some common words found in the essay are:
REQUIRED NiMH, REACTION NiMH, , Ovonic NiMH, OH NiOH2, NiOOH Ni, nimh battery, mh electrode, electrode form, nioh2 positive electrode, nioh2 positive, charge discharge, positive electrode, metal hydride, ovonic nimh battery, h2o +, hydride battery, + h2o +, bond strength, metal hydride battery, mh electrode form,

Approximate Word count = 654
Approximate Pages = 3 (250 words per page double spaced)

Category: Science

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