콘텐츠 본문
논문 해외 국제전문학술지(SCI급) Functionalized graphene for high performance lithium ion capacitors
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2012-05
- 저자명 Ji Hoon Lee, Weon Ho Shin, Myung-Hyun Ryou, Jae Kyu Jin, Junhyung Kim, Jang Wook Choi
- 학술지명 ChemSusChem
- 발행처명 WILEY-VCH VERLAG GMBH
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 6
- 논문 다운로드 링크(외부) DOI: 10.1002/cssc.201200549
- 연구분야 공학 > 화학공학
논문 초록 (Abstract)
Lithium ion capacitors (LICs) have recently drawn considerable attention because they utilize the advantages of supercapacitors (high power) and lithium ion batteries (high energy). However, the energy densities of conventional LICs, which consist of a pair of graphite and activated carbon electrodes, are limited by the small capacities of the activated carbon cathodes. To overcome this limitation, we have engaged urea-reduced graphene oxide. The amide functional groups generated during the urea reduction facilitate the enolization processes for reversible Li binding, which improves the specific capacity by 37?% compared to those of conventional systems such as activated carbon and hydrazine-reduced graphene oxide. Utilizing the increased Li binding capability, when evaluated based on the mass of the active materials on both sides, the LICs based on urea-reduced graphene oxide deliver a specific energy density of approximately 106 Wh?kgtotal-1 and a specific power density of approximately 4200 W?kgtotal-1 with perfect capacity retention up to 1000 cycles. These values are far superior to those of previously reported LICs and supercapacitors, which suggests that appropriately treated graphene can be a promising electrode material for LICs.
