- 研究番号：20C11
- 研究分野：science
- 研究種別：奨励研究
- 研究期間：2020年04月〜2021年03月
代表研究者
李 墨宸 理工総研が募集する次席研究員
LI Mochen Researcher
理工学術院総合研究所 野田 優研究室
Waseda Research Institute for Science and Engineering
研究概要
Carbon nanotube (CNT) is an important allotrope of low-dimensional carbon materials. CNTs exhibit a series of intriguing structure-dependent features that render them great promise for electronic devices. Through decades of research, mass production of CNTs has been considered as one of the main obstacles for their industrial applications. Among diverse approaches targeting their mass production, chemical vaper deposition (CVD) has been regarded as the most promising techniques for their production in commercial scale. In the past, our group have developed a fluidized-bed CVD (FBCVD) for the catalyst deposition on ceramic beads and established a semi-continuous production of sub-millimeter-long few-wall CNTs (FWCNTs). Although catalyst deposition using metalorganic vapors enabled quick and in-situ deposition of catalyst on the ceramic beads by FBCVD method, metalorganic precursors are not cheap. To further decrease the production cost of CNTs, the research of developing facile catalyst preparation/deposition method or using low cost catalyst precursor is important.
Additionally, CNTs have been studied extensively as the current collector of lithium-ion batteries (LIBs) due to their ability to form self-organized high conductive films and light weight. Among diverse LIBs using different active materials, lithium-sulfur (Li-S) batteries are regarded as a promising candidate for next-generation energy-storage systems due to their high energy densities, low cost and natural abundance of sulfur. However, the practical applications of Li-S batteries are impeded by the low conductivity of sulfur, shuttling effect of soluble polysulfide intermediates and large volume changes. Therefore, the fabrication of three-dimensional CNT current collectors and hybridized sulfur and CNT composite electrode would be a promising solution method.
In this research, the purpose is to (A) optimize the synthesis condition of SWCNTs using unsaturated hydrocarbon as carbon source in FBCVD reactor, (B) develop facile and stable metalorganic catalyst precursor supply method and synthesize FWCNTs both in FBCVD reactor, and (C) fabricate hybridized sulfur and CNT (S-CNT) composite cathodes possessing high sulfur content ( >70 wt%) using the as-produced CNTs.
