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  • 09월 01일 18시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제118회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Silicon oxycarbide with improved electrical conductivity and lithium diffusivity for high-performance hybrid supercapacitor

2016년 8월 30일 10시 36분 01초
ELEC.O-5 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 10시 : 05분
전기화학 - Oral Presentation in Electrochemistry
저자 및
한국과학기술연구원(KIST) 에너지융합연구단, Indonesia
Hybrid supercapacitors (HSCs) are recently gained a lot of attention since it takes the advantages of both high power density of supercapacitors (SCs) and high energy density of lithium-ion batteries (LIBs). HSC works by combining Faradaic reaction-based electrode from LIB and non-Faradaic reaction-based electrode from SCs. Herein, we report the investigation of silicon oxycarbide (SiOC) material in HSCs. SiOC is a ceramic material that consists of Si-O-C binding combinations such as SiO4, SiO3C, SiO2C2, SiOC3, and SiC4. High-performance SiOC was obtained by pyrolysis of phenyl-rich silicone oil. Higher pyrolysis temperature resulted in SiOC with greater electrical conductivity, which is crucial to achieving high rate capability performance. However, excessive pyrolysis temperature would result in SiOC with lower capacity. Thus, optimization is needed. Pyrolysis temperature also determines the composition of binding combinations of the SiOC. We found out that not all the binding combinations were beneficial for lithium ion storage. Among all the combinations, SiO2C2 is more likely to be responsible for providing lithium ion storage sites within the SiOC matrix indicated by its high capacity. Moreover, the structure of SiOC also plays an important role in providing smooth lithium ion mobilization. By employing the optimized SiOC, we successfully fabricated HSCs providing an extremely high power density of 156 kW kg-1 while maintaining relatively high energy density of 25 Wh kg-1. In addition, the resulting HSCs demonstrated great durability demonstrated by high energy density retention of >90% even after 75,000 cycles.