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리튬이차전지 양극 소재 재활용을 위한 소재 전처리 공정 연구
황준혁 ( Junhyeok Hwang ),오필건 ( Pilgun Oh ) 한국화상학회 2024 한국화상학회지 Vol.30 No.1
The increasing demand for lithium-ion batteries due to the growth of large-scale battery markets such as electric vehicles and power storage systems has led to a significant surge in the generation of spent batteries. Consequently, handling this waste has become a pressing social issue. The most effective methods for spent battery treatment involve reuse and recycling. Among these, recycling of battery materials, particularly cathode materials, which are expensive metals, has been the focus of extensive research due to its economic viability. However, the black powder recovered from spent batteries contains conductive materials and binder materials, necessitating a process to remove them for cathode material recycling. This study presents a material pretreatment approach for the recycling of cathode materials extracted from spent batteries. Two pretreatment methods, thermal treatment and chemical treatment, were employed to remove impurities. Following this, the removal was confirmed through SEM analysis, and quantitative analysis of impurities was conducted through TGA and EA analysis, and the electrochemical performance was analyzed.
웹 애플리케이션에서 하드웨어 엑세스를 위한 웹서버 기반의 중계시스템 개발
오준혁 ( Junhyeok Oh ),안재용 ( Jaeyong An ),김동연 ( Dong-yeon Kim ),임태윤 ( Tae Yoon Lim ),원진섭 ( Won Jinsub ),황준호 ( Jun Ho Hwang ),김유식 ( You Sik Kim ),우덕하 ( Deok Ha Woo ),이석 ( Seok Lee ) 한국정보처리학회 2019 한국정보처리학회 학술대회논문집 Vol.26 No.2
본 논문에서는 웹 애플리케이션에서 하드웨어를 엑세스 하기 위한 중계시스템을 개발하는데 목적이 있다. 웹 애플리케이션의 일종인 Scratch에서 스마트 블록과 같은 하드웨어를 엑세스 하기위해 웹 서버기반의 중계시스템을 개발하였다. 중계시스템 개발을 통해 Scratch와 스마트 블록을 활용하여 피지컬 컴퓨팅 교육을 통해 학습자의 컴퓨팅적 사고 함양에 기여 한다.
Spectroscopy-H*(10) Rate Conversion Function G(E) for a Plastic Scintillation Detector
Jisung Hwang,Junhyeok Kim,Kilyoung Ko,Wonku Kim,Jaehyun Park,Gyohyeok Song,Sangho Lee,Gyuseong Cho 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
Dose-rate monitoring instruments are indispensable to protect workers from the potential risk of radiation exposure, and are commonly calibrated in terms of the ambient dose equivalent (H*(10)), an operational quantity that is widely used for area monitoring. Plastic scintillation detectors are ideal equipment for dosimetry because of their advantages of low cost and tissue equivalence. However, these detectors are rarely used owing to the characteristics caused by low-atomic-number elements, such as low interaction coefficients and poor gamma-ray spectroscopy. In this study, we calculated the G(E) function to utilize a plastic scintillation detector in spectroscopic dosimetry applications. Numerous spectra with arbitrary energies of gamma rays and their H*(10) were calculated using Monte Carlo simulations and were used to obtain the G(E) function. We acquired three different types of G(E) functions using the least-square and first-order methods. The performances of the G(E) functions were compared with one another, including the conventional total counting method. The performance was evaluated using 133Ba, 137Cs, 152Eu, and 60Co radioisotopes in terms of the mean absolute percentage error between the predicted and true H*(10) values. In addition, we confirmed that the dose-rate prediction errors were within acceptable uncertainty ranges and that the energy responses to 137Cs of the G(E) function satisfied the criteria recommended by the International Commission.
Absorption and desorption of SO<sub>2</sub> in aqueous solutions of diamine-based molten salts
Lim, Seung Rok,Hwang, Junhyeok,Kim, Chang Soo,Park, Ho Seok,Cheong, Minserk,Kim, Hoon Sik,Lee, Hyunjoo Elsevier 2015 Journal of hazardous materials Vol.289 No.-
<P><B>Abstract</B></P> <P>SO<SUB>2</SUB> absorption and desorption behaviors were investigated in aqueous solutions of diamine-derived molten salts with a tertiary amine group on the cation and a chloride anion, including butyl-(2-dimethylaminoethyl)-dimethylammonium chloride ([BTMEDA]Cl, p<I>K</I> <SUB>b</SUB> =8.2), 1-butyl-1,4-dimethylpiperazinium chloride ([BDMP]Cl, p<I>K</I> <SUB>b</SUB> =9.8), and 1-butyl-4-aza-1-azoniabicyclo[2,2,2]octane chloride ([BDABCO]Cl, p<I>K</I> <SUB>b</SUB> =11.1). The SO<SUB>2</SUB> absorption and desorption performance of the molten salt were greatly affected by the basicity of the molten salt. Spectroscopic, X-ray crystallographic, and computational results for the interactions of SO<SUB>2</SUB> with molten salts suggest that two types of SO<SUB>2</SUB>-containg species could be generated depending on the basicity of the unquaternized amino group: a dicationic species comprising two different anions, HSO<SUB>3</SUB> <SUP>−</SUP> and Cl<SUP>−</SUP>, and a monocationic species bearing Cl<SUP>−</SUP> interacting with neutral H<SUB>2</SUB>SO<SUB>3</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Diamine-based molten salts having two different basic sites were synthesized. </LI> <LI> Weakly basic molten salts reversibly interact with SO<SUB>2</SUB> in aqueous media. </LI> <LI> The SO<SUB>2</SUB> absorption mode was greatly affected by the basicity of molten salts. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>