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전환반응 기반 전이금속산화물 리튬이온전지 음극 활물질 개발 동향과 전망
권민재(Minjae Kwon),박종윤(Jongyoon Park),황종국(Jongkook Hwang) 한국세라믹학회 2022 세라미스트 Vol.25 No.2
The rapid increase in demand for high-performance lithium ion batteries (LIBs) has prompted the development of high capacity anode materials that can replace/complement the commercial graphite. Transition metal oxides (TMOs) have attracted great attention as high capacity anode materials because they can store multiple lithium ions (electrons) per unit formula via conversion reaction, resulting in high specific capacity (700-1,200 mAh g⁻¹) and volumetric capacity (4,000-5,500 mAh cm⁻³). In addition, TMOs are cheap, earth-abundant, non-toxic and environmentally friendly. However, there have been no reports of practical LIBs using conversion-based TMO anodes, because of several major problems such as large voltage hysteresis, low initial Coulombic efficiency (large initial capacity loss), low electrical conductivity, and large volume changes (100~200%). This review summarizes the recent progress, challenges and opportunities for TMO anode materials. The conversion reaction mechanism, problems and solutions of TMO anode materials are discussed. Considering iron oxide as a promising candidate, future research directions and prospects for the practical use of TMO for LIB are presented.
일측(一側) 갑상선(甲狀腺) 제거(除去)가 I<sup>131</sup>의 대사(代謝)에 미치는 영향
장병표,권종국,이영소,정영채,이대영,Chang, Byung Pyo,Kwon, Jong Kuk,Lhee, Young So,Chung, Yung Chai,Lee, Dae Yung 대한수의학회 1967 大韓獸醫學會誌 Vol.7 No.2
In these studies, the relationship of the thyroid function of normal and unilateral thyroidectomized rabbit, were st studied. $I^{131}$ uptake rate of the thyroid gland, the concentration of the $PBI^{131}$ and $I^{131}$ in the blood, erum $PBI^{131}$ conversion ratio, and the thyroidal $I^{131}$ release rate in ten rabbits were mesured following a single intramuscular injection of $10{\mu}ci$ of $I^{131}$. 1. The thyroidal $I^{131}$ uptake rate in the treated group were 5.06, 8.58, 6.46, and 6.54% in 12, 36, 60 and 85 hrs., respectively, after injection of $I^{(3)}$. The uptake rate were significantly differrenciate between the two groups. (P<0.05) 2. The $PBI^{(3)}$ conversion ratios were 9.87, 15.63, 41.01, 66.25 and 66.25% in 12, 36, 132, 180 hrs., respectively, after injection of $I^{131}$. No significant difference was observed between the groups. 3. The concentration of $PBI^{131}$ and $I^{131}$ in the blood were significant between the groups. 4. The excretion rate of $I^{131}$ in urine was not significant between two groups, but the excretion of $I^{131}$ in the treated group was higher than that of the control group. 5. The exrcetion rate of $I^{131}$ in feces in the treated group were significantly higher than the control group. (p<0.01)
환경오염 물질인 메타미포프의 정제 및 다양한 순도 결정 방법을 통한 표준물질 제조 연구
김승환 ( Seung-hwan Kim ),김여진 ( Yeo Jin Kim ),정대원 ( Dae-won Chung ),권종국 ( Jong-kook Kwon ),이석기 ( Seok-ki Lee ) 한국환경분석학회 2018 환경분석과 독성보건 Vol.21 No.2
In this study, we purified an environmental pollutant (metamifop) by re-crystallization under various conditions and prepared four kinds of high-purity reference materials (RM) that show small variations in purity among each other. To measure their purities with uncertainty, four different analytical methods were employed: differential scanning calorimetry (DSC), peak area normalization (HPLC), external calibrant (HPLC), and quantitative NMR (q-NMR). The highest purity of metamifop RM, determined by q-NMR, was 99.02% with an uncertainty of 0.64% compared with 99.36% (with 0.12% uncertainty), 99.46% (with 0.53% uncertainty) and 99.84% (with 0.29% uncertainty), determined by DSC, external calibrant, and peak area normalization, respectively. Most of the evaluated purities are within the calculated uncertainty range.