하이브리드 커패시터용 탄소소재의 제조와 전기화학적 특성

Abstract

Preparation and Electrochemical Properties of Carbon Material for Hybrid Capacitor

In-Sik Choi

Department of Industrial Chemistry, The Graduate School, Pukyung National University, Busan, Korea (Supervised by Professor Dae-Hee Oh

Abstract

Recently, high capacity and power carbon material manufacture technology, which is the important technology of high-energy density hybrid capacitor for various use, has been applied as the electrode material for asymmetrical capacitor to receive great attention as the original material technology development that can largely improve energy density characteristic and is also being highly evaluated for its growth potential. Lithium ion capacitor, a type of high-energy density hybrid capacitor, is a asymmetrical capacitor using electrode material with different electrochemical mechanism in positive and negative poles within one cell through use of electric double layer capacitor principle. This is composed as structure that combines activated carbon as positive materials of electric double layer capacitor and complex Li-predoped graphite as negative electrode materials with lithium secondary battery. Also, unlike electric double layer capacitor, energy density is improved to be evaluated as the optimum electric energy saving devices that can actualize functions of high-output pulse power, continuous output pulse power, high energy density, and long-life characteristic of over 10 years. Other characteristics of lithium ion capacitor are low leakage current, wide temperature range (-30～70℃) and outstanding operation connectivity with dispersed power to be regarded as electric energy saving technology with very high potential for providing new technological innovation to overall saving industry. In this study has increased energy density per unit volume higher than electric double layer capacitor using existing porous activated carbon and has used high capacity and power carbon materials to actualize higher output density and lifespan characteristic compared to existing secondary battery to research relative electrochemical characteristics, and has produced related optimized cell to research its characteristics.