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이태규,강희주,김미진,구여진,박혜진,전영시 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Hard carbon is engaged a promising alternative to commercial graphite anode for sodium-ion batteries (SIBs) because of its low cost, relatively expanded interlayer distance. Herein, we developed nitrogen-containing hard carbon using molecular-cooperative-assembly between melamine and barbituric acid. 3D-spherical melamine-barbituric acid (MBA) complex was obtained by hydrogen bonding in DMSO as a solvent, and nitrogen content of its heating products (800~1000°C, under nitrogen flow) are easily controllable by differing heating temperature. As a result, MBA-900 exhibits 370 mAh/g at the constant current density of 250 mA/g after the 100th cycle. It is remarkably high value, considering poor electrical conductivity derived from high nitrogen content (16 wt.%). This high performance of sodium ion battery employing MBA-900 will be discussed through XRD, BET, GCPL, EIS.
Mesoporous, Hollow Microspheres as High Performance Cathodes for Lithium-Sulfur Batteries
김미진,강희주,이태규,구여진,박혜진,송지윤,전영시 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Practical application of lithium-sulfur batteries is mainly limited by a low areal capacity around 2 mAh/㎠. In order to achieve a high-arealcapacity cathode, we prepare mesoporous, hollow microspheres with high pore volume. Triazine crystals of melamine and cyanuric acid (MCA) is utilized as structure directing agents, into which glucose is introduced as additional carbon source. Glucose trapped inside crystal structure of MCA is heated to 600 degrees Celsius under nitrogen atmosphere for carbonization. The resulting microspheres (2~6 μm), MCA-GL-20M-600, features nitrogen-rich microstructure and hollow porous structure with a pore volume of 2.3 ㎤/g, a BET surface area of 367.54㎡/g and a pore size of 35 nm. MCA-GL-20M-600 enables a high sulfur-loading cathode (~10 mg/㎠) and thereby exhibits an areal capacity of ~8.5 mAh/㎠ at C/5 over 100 cycles with minor capacity loss.
강희주,김미진,이태규,구여진,박혜진,전영시 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Lithium-Sulfur Batteries (LSBs) are considered one of the most promising battery technologies for electric vehicles and energy storage systems. Herein, we propose siloxene-based additive materials for LSBs. Reactive extraction technique using HCl was used in order to drive their two-dimensional (2D) layered structures (2D Siloxene) from CaSi<sub>2</sub>. Being utilized as cathode-additive materials, 2D Siloxene was able to physically absorb lithium-polysulfides using abundant hydroxyl surface functional groups and increase the tortuosity of the cathode, preventing lithium-polysulfides dissolution. These two effects were thoroughly unveiled by XRD, XPS, and EM. LSBs employing 2D Siloxene (4 mg/㎠) achieved a high areal capacity of ~7 mAh/㎠ with a 10 mg/㎠ sulfur loading corresponding to 43% sulfur-utilization efficiency after 120 cycle at 0.1 C.
Van Khanh Nguyen,최원영,하연주,구여진,이찬희,박재현,장건우,신차정,조순자 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
Two highly tellurite-resistant bacteria were isolated from wastewater. Both bacteria could performtellurite reduction under an initial pH of 5–9, temperature of 20–37 C, and salinity conditions lower than5%. The maximum reduction rate of strain WYA (Vmax = 20.45 mMh 1) was much higher than that of strainWYS (Vmax = 11.49 mMh 1). Both bacteria produced tellurium nanorods that were accumulatedintracellularly or extracellularly. Strain WYA is a new strain belonging to the Raoultella genus, whereasstrain WYS belongs to the Escherichia genus. This study indicated that both these bacteria are potentialmicroorganisms for green synthesis of tellurium nanorods, which have a wide application inenvironmental remediation and the nanotechnology industry.