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Effect of hierarchically reduced SiOx on anode performance of Li-ion batteries
문단비,Kim Kue-Ho,안효진 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.12
Renewable energy sources have attracted considerable attention in both academia and industry owing to concerns about environmental pollution, global warming, and fossil fuel depletion. In this regard, the application scope of Li-ion batteries (LIBs) is continuously broadening owing to their advantages, such as their high energy and power densities, eco-friendliness, and portability. As highly capacitive anode materials for LIBs, Si-based materials should circumvent the critical limitations of large volume expansion and low electrical conductivity. Herein, we propose hierarchically reduced SiOx as an anode material for LIBs. Using the magnesiothermic reduction process, we optimized the electrical conductivity and kinetic properties of SiOx materials based on SiO2. The resultant SiOx electrode exhibited a high specific capacity of 1,286.8 mAh g−1 along with stable cyclability up to 100 cycles. The enhanced electrochemical performance was mainly attributed to the oxygen vacancies and mesoporous surface morphology of SiOx, which were generated during hierarchical magnesiothermic reduction. This study demonstrates the correlation between the structural properties and electrochemical performance according to the reduction level of Si-based active materials.
비산재와 제올라이트 처리에 의한 토양탄소 격리능 증대 가능성 평가
임상선 ( Sang-sun Lim ),이선일 ( Sun-il Lee ),이동석 ( Dong-suk Lee ),이광승 ( Kwang-seung Lee ),김미리 ( Mi-li Kim ),문단비 ( Dan-bi Moon ),최우정 ( Woo-jung Choi ) 한국농공학회 2010 한국농공학회 학술대회초록집 Vol.2010 No.-
Soil is the largest carbon sink in terrestrial ecosystem and agricultural soils have a great potential of carbon sequestration due to their lower carbon storage than carbon saturation point. A 15-days incubation experiment was conducted to assess enhancement of carbon sequestration potential of agricultural soils by Fly-ash (FA) and Zeolite (Z) application. Thirteen treatments were laid out: control (without FA or Z), F<sub>2</sub>, F<sub>5</sub>, F<sub>10</sub>, F<sub>15</sub>, F<sub>25</sub>, F<sub>50</sub>, Z<sub>2</sub>, Z<sub>5</sub>, Z<sub>10</sub>, Z<sub>15</sub>, Z<sub>25</sub> and Z<sub>50</sub> (the subscript indicates the % of FA or Z to soil weight). Glucose was added as a carbon source at 200 mg kg<sup>-1</sup> and CO<sub>2</sub> emission from the soils were determined. The cumulative CO<sub>2</sub>-C emission during the 15-days incubation of the control was 325.2 mg C kg<sup>-1</sup>, whereas application of FA (ranged from 255.7 to 359.4 mg C kg<sup>-1</sup>) or Z (ranged from 241.6 to 298.4 mg C kg<sup>-1</sup>) reduced CO<sub>2</sub> emission except for F<sub>25</sub> and F<sub>50</sub> treatments. The cumulative CO<sub>2</sub>-C emission relative to the control corresponds to -21.4 to 10.5% for FA and to -25.7 to -8.3% for Z amended soils. As the effects of FA and Z application on soil environment are very complicated, it is not straightforward to interpret such pattern. In our study, the reduction of CO<sub>2</sub> emission by FA and Z applications could be ascribed primarily to CO<sub>2</sub> adsorption by CaO in FA (7.0%) and Z (2.5%) through the carbonation process and entrapment of CO<sub>2</sub> in micro-pores and channels in porous Z could also contribute to such reduction. These results suggest that application FA and Z has a potential to reduce CO<sub>2</sub> emission from soils; however, further studies are required to discover the mechanism of their effects.