Hi-k dielectric ceramic material for supercapacitors

4^th International Conference and Exhibition on Materials Science & Engineering

September 14-16, 2015 Orlando, USA

Saloni Jain

University of Leeds, UK

Posters-Accepted Abstracts: J Material Sci Eng

Abstract :

Supercapacitors are electrical devices with capacitances value upto 10,000 Farad, a value greater than any other conventional or ordinary capacitors. Supercapacitors charges by an electrostatic mechanism with positive as well as negative electric charges on the conducting surface of a capacitor for electrical energy storage non-faradic reaction or the movement of charges. Supercapacitor cell performance depends mainly on the electrode material. The energy density of the supercapacitor has a lower value than the available batteries in the market. The value of energy-storage density of supercapacitor is as low as 10 Watt-hour/kg while lithium ion batteries is more than 90 Watt-hr/kg. Mainly, specific energy and specific capacitance are the two terms used for to determine the performance of the material for supercapacitors. There are many high-k dielectric materials that are used to fabricate supercapacitors. Hi-k dielectric uses ferroelectric ceramics like Barium titanate with large permitivity ranging from 1000-20,000 and dissipation factor or loss factor of around 0.01 to 0.03. Barium titanate (BaTiO3) and barium zirconium oxide BaZrO3 (BTZ) are considered as two main high-k dielectric material suitable in the making of supercapacitor. Zirconium metal (Zr) can be added to the BaTiO3 ceramic to increase its permittivity range and also lowers the cost of the ceramic material. After the restriction of using toxic lead (Pb)-based ceramics, efforts were made to make ferroelectric material without the presence of lead-metal with suitable properties over a wide range of temperature. Ceramic material like BCT-BMT offers stable properties at temperature above 200⁰C-300 ⁰C. The dielectric material has high relative permittivity and low loss factor useful for many applications like hybrid vehicles and electronic system.

Biography :

Email: j.saloni@hotmail.com