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ULTRA CAPACITORS

ULTRA CAPACITORS

Submitted By: avvarusaisumanth

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Ultracapacitors A REVOLUTIONARY TECHNOLOGY.zip  (833 Kb)
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ultra capacitors report (MSWORD format)
Description:
ULTRACAPACITORS

(A NEW REVOLUTIONARY TECHNOLOGY)





Abstract:



The science and technology of ultracapacitors are reviewed for a number of electrode materials, including carbon, mixed metal oxides, and conducting Polymers .More work has been done using microporous carbons than with the other materials and most of the commercially available devices use carbon electrodes and an organic electrolytes.

This paper reveals the importance and the urgent need for the evolution of ultra capacitors which is expected to bring a revolutionary and remarkable change in the replacement of the traditional batteries. The need for ultracapacitors is lucidly mentioned in this paper. The fundamental phenomena of capacitor charging is mentioned which serves as a foundation in further advancements. The role of Nanotubes in the development of ultra capacitor is dealt. The advantage of Nanotubes over conventional capacitors is explained. The main problem faced is the capacitor current is capacitor current is a function of both voltage change and capacitance change as a function of voltage. So the specifications are to be considered in the ultracapacitor. Using all these method of ultracapping a car is briefly dealt


Contents:





Introduction

Reason for development

How do ultracapacitors store energy?

Construction of ultracapacitors

Where do ultracapacitors fit in?

Ultracapping a CAR

conclusion

References.





INTRODUCTION:



A smattering of mass-transit vehicles and industrial machines may seem like one wimpy revolution, but revolutionary they are unlike most of their electric relatives, these vehicles all share one key attribute: they don't run on batteries. Instead, they are powered by ultracapacitors, which are souped-up versions of that tried-and-true workhorse of electrical engineering, the capacitor.

A bank of ultracapacitors releases a burst of energy to help a crane heave its load aloft; they then capture energy released during the descent to recharge. Because no chemical reaction is involved, ultracapacitors also known as supercapacitors and double-layer capacitors are much more effective at rapid, regenerative energy storage than chemical batteries are. What's more, rechargeable batteries usually degrade within a few thousand charge-discharge cycles. In a given year, a light-rail vehicle might go through as many as 300 000 charging cycles, which is far more than a battery can handle. The synergy between batteries and capacitors has been growing, to the point where ultracapacitors may soon be almost as indispensable to portable electricity as batteries are now.

Ultracapacitors are already all over the place. Millions of them provide backup power for the memory used in microcomputers and cell phones. Perhaps most exciting is could do for electric cars. They're being explored as replacements for the batteries in hybrid cars. In ordinary cars, they could help level the load on the battery by powering acceleration and recovering energy during braking. Most deadly to the life of a battery are the moments when it is subjected to high-current pulses and charged or discharged too quickly. Conveniently, delivering or accepting power during short-duration events is the ultracapacitors strongest suit. And because capacitors function well in temperatures as low as –40 ºC, they can give electric cars a boost in cold weather, when batteries are at their worst.
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 April 2, 2011

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