http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Facile preparation of mesoporous SiOx/C microsphere for an anode material of Li ion battery
류재춘,김경훈,노의영,이진배,이영석 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Many efforts have been devoted to the development of the anode electrode materials of lithium-ion batteries (LIBs) with high capacity. Silicon sub-oxides (SiOx) has attracted great interest due to its high theoretical capacity (4200 mA h g<sup>-1</sup>). However, SiOx is limited by its low conductivity and large volume change. To solve this disadvantage, SiOx/C composites to give high lithium storage performance have been suggested. In this study, we suggested a facile and economic preparation method of mesoporous SiOx/C microsphere using petroleum pitch as a cheap carbon source. We synthesized the mesoporous SiO<sub>2</sub> microsphere (MSM) using modified Stöber process. The MSM was coated with petroleum pitch by chemical vapor deposition and then heat-treated in range of 600-900℃. We tested the lithium storage performance of as-prepared SiOx/C microsphere as an anode material of LIB. The results showed that the prepared SiOx/C microsphere had high capacity and cycling stability for lithium storage.
M/Fe2O3 (M = Rh, Ce 및 Zr) 혼합 산화물의 산화-환원을 이용한 수소 저장 특성
류재춘,김영호,황갑진,양현수,박주식,이동희,김종원 한국수소및신에너지학회 2006 한국수소 및 신에너지학회논문집 Vol.17 No.1
M/Fe2O3 (M=Rh, Ce and Zr) mixed oxides were prepared using urea method to develop a medium for chemical hydrogen storage by their redox cycles. And their redox behaviors by repeated cycles were studied using temperature programmed reaction(TPR) technique. Additives such as Rh, Ce and Zr were added to iron oxides in order to lower the reaction temperature for reduction by hydrogen and re-oxidation by water-splitting. From the results, concentration of urea used as a precipitant had little effect on particle size and reduction property of iron oxide. TPR patterns of iron oxide consisted of two reduction peaks due to the course of Fe2O3 → Fe3O4 → Fe. The results of repeated redox tests showed that Rh added to iron oxide have an effect on lowering the re-oxidation temperature by water-splitting. Meanwhile, Ce and Zr additives played an important role in prevention of deactivation by repeated cycles. Finally, Fe-oxide(Rh, Ce, Zr) sample added with Rh, Ce and Zr showed the lowest re-oxidation temperature by water-splitting and maintained high H2 recovery in spite of the repeated redox cycles. Consequently, it is expected that Fe-oxide(Rh, Ce, Zr) sample can be a feasible medium for chemical hydrogen storage using redox cycle of iron oxide.