“Study of Graphene based coin cell-type symmetric supercapacitor” BY Mr. Girish Sambhaji Gund M. Sc. UNDER THE GUIDANCE OF Prof. C. D. Lokhande M. Sc., Ph. D. THIN FILM PHYSICS LABORATORY, DEPARTMENT OF PHYSICS, SHIVAJI UNIVERSITY, KOLHAPUR - 416 004 (INDIA) 2013
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“Study of Graphene based coin cell-type
symmetric supercapacitor”BY
Mr. Girish Sambhaji GundM. Sc.
UNDER THE GUIDANCE OF
Prof. C. D. Lokhande
M. Sc., Ph. D.
THIN FILM PHYSICS LABORATORY,
DEPARTMENT OF PHYSICS, SHIVAJI UNIVERSITY,
KOLHAPUR - 416 004 (INDIA)
2013
Objectives
Introduction to supercapacitor
Why graphene?
Graphene thin films by screen printing
Characterization of graphene thin films
Device fabrication and performance evaluation of coin cell-type
symmetric device based on graphene thin films in non-aqueous
electrolyte
Demonstration
Conclusions
Plan of Presentation
Objectives
To develop efficient, small size and low cost energy storage
device in order to employ in portable electronics.
The use of carbon based electrode material in supercapacitor as its
abundant in nature with the intention to replace toxic and high cost
RuO2 and IrO2.
Supercapacitors
A Supercapacitor is an electrochemical capacitor that has an high
energy density and capacitance compare to ordinary capacitor.
APPLICATIONS
1. Power Electronics
2. Telecommunication
Devices
3. Satellites
4. Standby Power Systems
5. Electrical Hybrid Vehicles
ADVANTAGES OVER BATTERIES
1. Very high rates of charge and
discharge
2. Little degradation over hundreds of
thousands of cycles
3. Good reversibility
4. Low toxicity of materials used.
5. High cycle efficiency (95% or more)
Types of Supercapacitor
Electric Double layer capacitors (EDLCs): The storage
mechanism involves charge separation at electrode – electrolyte interface
(carbon based).
Pseudocapacitors: Pseudocapacitance arises from reversible Faradaic
reactions occurring at the electrode, and is denoted as ‘pseudo’-capacitance
in order to differentiate it from electrostatic capacitance.