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Supercapacitor
This document discusses supercapacitors, also known as ultracapacitors. It provides a brief history, noting they were first developed in 1957 and licensed for market production in 1978. Supercapacitors store energy electrostatically at the interface between an electrode and electrolyte through a double-layer capacitance effect. They have a higher power density than batteries but lower energy density. The document outlines the key components of a supercapacitor including polarized electrodes made of highly porous activated carbon, electrolytes that allow ion migration during charging and discharging, and separators that provide insulation between electrodes while allowing ion conduction. Applications mentioned include use in diesel engines, trains, power systems, and missiles to recover and deliver braking energy.
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Supercapacitor
- 1. SUPERCAPACITOR As energy storagedevice NAME: Abdul Saleem Mir Enrollment Number: 49/2010 7th ELECTRICAL
- 2. Supercapacitor Definition Supercapacitors areelectrochemical devices with following features: • • • • High energy density. High power density. High capacitance. Longer life 2
- 3. HISTORY • The firstsupercapacitor based on double layer mechanism was developed in 1957 by General Electric using porous electrode. • Standard Oil Company Cleveland Ohio rediscovered this effect in 1966 & gave licensing to NEC in 1978 for market production. 3
- 4. Principle Construction It consistsof following components: • Current collector: Metal contacts are used as current collectors . 4
- 5. Polarized electrode: Highlyactivated carbon is used as electrode because of following reasons: • It is highly porous • It has extraordinarily high specific surface area • It has good conductivity • High temperature and chemical stability • Corrosion resistant 5
- 6. Electrolyte It contains dissolvedand solvated ions that migrate to and from the electrodes during charge and discharge respectively. Electrolytes are of two types: • Water soluble • Water insoluble 6
- 7. Separator It acts asmechanical separation between two electrodes. It must provide electronic insulation between the electrode of opposite polarization It must support ionic conduction from one electrode to another. 7
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- 11. Advantages • • • • High energy storage LowESR and hence high power density Appreciable operating temp.(-40ºC to 70ºC) Eco-friendly 11
- 12. Disadvantages • Low voltageper cell • It can't be used in AC & high frequency circuits 13
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- 14. Applications • Used inDiesel engine start up in submarines & tanks. • Used to recover braking energy in HEV & modern trains and deliver the same during accelerating periods. • Can be used in f &V control in power systems • Used as backup energy source for GPS guided missiles 14
- 15. Flat style ofsuper capacitor used for mobile devices. Typical knob capacitor For PCB mounting used for memory backup Radial style of lithiumIon capacitor for PCB mounting used for industrial applications 15
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- 17. References R.Morrison, ‘’Thechemical physics of surfaces’’ New York: Plenum,1990. E.J.Dowgiallo & A.F.Bruke ‘’ Ultracapacitors for electric and hybrid vehicles: A technology update.’’ B.E.Conway, ‘’Electrochemical Supercapacitors’’, chemical industry press. IEEE transactions on industry applications, vol. 36. ‘’Transient analysis of pulsed charging in Supercapacitors’’ IEEE documentation. 17
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Editor's Notes
- #2 This template can be used as a starter file for presenting training materials in a group setting.SectionsRight-click on a slide to add sections. Sections can help to organize your slides or facilitate collaboration between multiple authors.NotesUse the Notes section for delivery notes or to provide additional details for the audience. View these notes in Presentation View during your presentation. Keep in mind the font size (important for accessibility, visibility, videotaping, and online production)Coordinated colors Pay particular attention to the graphs, charts, and text boxes.Consider that attendees will print in black and white or grayscale. Run a test print to make sure your colors work when printed in pure black and white and grayscale.Graphics, tables, and graphsKeep it simple: If possible, use consistent, non-distracting styles and colors.Label all graphs and tables.
- #4 Give a brief overview of the presentation. Describe the major focus of the presentation and why it is important.Introduce each of the major topics.To provide a road map for the audience, you can repeat this Overview slide throughout the presentation, highlighting the particular topic you will discuss next.
- #6 This is another option for an Overview slides using transitions.
- #16 Radial