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제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Various morphology controlled mesoporous carbon materials for anode material in Li ion battery

2012년 2월 16일 16시 09분 24초
ELEC.P-1278 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 25일 (수요일) 18:00~21:00
저자 및
김민식, 유종성
고려대학교 신소재화학과, Korea
In recent decades, Li ion batteries have been considered as a leading candidate for electric/hybrid vehicles and high-end consumer electronic products due to their high electromotive force and high energy density. However, presently many potential Li ion batteries electrode materials are experiencing slow Li ion diffusion and high resistance at the interface of electrode/electrolyte at high charge-discharge rates, Furthermore, rate capability, dominated mainly by the diffusion rate of Li ion and the electron transfer in electrode materials, must be improved considerably. To date, extensive research work has been done to improve transport of Li ion and electron. In order to improve the transport of Li ions within electrode, various nanostructured materials with high surface area, nanoscale size and/or nanoporous structure have been widely investigated. Particularly, nanostructured porous carbon materials have received great attensions. Nanostructured carbon materials have demonstrated good electrode properties in diversified energy storage and conversion systems, such as low temperature fuel cells, hydrogen storage systems, solar cells, and lithium ion batteries as well. One of these nanostructured carbon materials, ordered mesoporous carbon (CMK-3) has demonstrated greatly enhanced Li storage capacity and/or improved the rate capability compared with commercial graphite anode. In this work, CMK-3 of different lengths was explored as anode in Li ion battery. Compared with the commercial graphite, the various CMK-3 not only demonstrates higher Li storage capacity, but also better cycling performance and rate capability. The enhanced capacity and improved cycling performance and so the rate capability are mainly attributable to the unique structural characteristics such as large surface area and mesopore volume of various CMK-3, facilitating fast mass transport. CMK-3 with different lengths serves as efficient Li storage and buffer reservoir, which not only shortens the diffusion path for Li ions but also reduces volume change during the charge?discharge cycling especially at higher rate.