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나단,소윤섭,서인석 한국기계기술학회 2020 한국기계기술학회지 Vol.22 No.3
In this study, the explosion processes of the battery according to by heating was identified using complex sensors including temperature, infrared (IR), visible, and ultraviolet (UV) sensors. A safe chamber was prepared for the explosion of the batteries according to heating. In order to detect signals from the battery during heating, complex sensors including temperature, IR, visible, and UV sensors were used inside the safe chamber. The heating was increased from room temperature to 165℃ at 10℃/min and then, kept 165℃. During the heating was kept at 165℃, the battery was exploded and a temperature was increased up to 380℃ abruptly due to explosion of the battery. Before the battery was exploded, the signals of the sensors were not detected. However, during explosion of the battery, the signals of IR, visible, and UV sensors were strongly detected. By analyzing various signals of the these sensors, the explosion of the battery according to heating was investigated.
나단(Dan Na),윤백상(Baeksang Yoon),정준호(Junho Jeong),김상길(Sanggil Kim),서인석(Inseok Seo) 한국전지학회 2022 한국전지학회지 Vol.2 No.1
본 논문에서 LATP 고체 전해질을 사용하고 Ru 촉매를 적용한 SuperP 양극으로 사용하고 리튬 메탈을 음극으로 사용한 Li-CO₂ 전지 제조 및 특성평가를 통해 Ru 촉매의 효과에 대해 논의한다. Ru 촉매를 적용했을 때 분극 전압의 크기가 약 3.4 V에서 1.3 V로 현저하게 감소하였다. Ru 촉매의 적용은 분극의 크기를 줄여 배터리의 전기화학반응의 저항을 줄이고 Li-CO₂ 전지의 안정성을 높이는 역할을 하였다. In this study, we designed a novel electrode-electrolyte configuration for stable and high-performance Li-CO₂ batteries. Ru and SuperP-based catalyst is combined with LATP solid electrolyte for electrochemical characterization. The LATP is synthesized by a solution-based method and shows an ionic conductivity of 3.77 × 10<SUP>-4</SUP> S/cm. From the XRD patterns, the composite nature of SuperP with Ru powder is well established. From electrochemical comparative studies, it is found that the polarization of Li-CO₂ batteries decreased significantly from ~ 3.4 V to 1.3 V with Ru-based cathode catalyst. From XRD analysis, we confirmed that Li₂CO₃ is less accumulated in the cathode when Ru catalyst is applied. Therefore, the use of Ru-based catalyst plays a role in reducing the polarization, whereas the solid electrolyte improves the stability and safety of the Li-CO₂ batteries.
Polyacrylonitrile 기반 탄소 나노 섬유를 적용한 리튬-이산화탄소 전지에 관한 연구
나단(Dan Na),윤백상(Baeksang Yoon),유도현(Dohyeon Yu),소윤섭(Yoonseob So),강준영(Joonyoung Kang),서인석(Inseok Seo) 한국전지학회 2023 한국전지학회지 Vol.3 No.2
In this paper, a Li-CO₂ battery was fabricated by applying polyacrylonitrile-derived carbon nanofibers prepared through electrospinning. Electrospun carbon nanofibers have chemical and structural properties favorable for CO₂ gas adsorption. The battery operated successfully for up to 50 cycles. After the cycle test, the characteristics of the positive electrode of the Li-CO₂ battery were evaluated, and it was confirmed that the discharge product was Li₂CO₃ and that it was reversibly formed and decomposed during the charging and discharging process. This shows that carbon nanofibers prepared by electrospinning are promising materials for Li-CO₂ battery research.
정현우(Hyeonwoo Jeong),나단(Dan Na),정준호(Junho Jeong),김상길(Sang-Gil Kim),서인석(Inseok Seo) 한국전지학회 2021 한국전지학회지 Vol.1 No.1
본 논문에서 NASICON 형태인 리튬-알루미늄-실리콘-티타늄-인이 포함된 고체전해질을 합성하였다. 파우더와 펠릿의 미세구조 및 형태는 전자현미경을 이용하여 측정하였다. 결정구조는 X-선 회절법에 의해서 평가하였는데, JCPDS 결과와 거의 일치하였다. LASTP의 이온전도도는 4.0×10<SUP>-4</SUP> S㎝<SUP>-1</SUP>으로 측정되었다. 그러므로, LASTP 고체전해질은 전고체 전해질에 사용될 유망한 물질이 될 수 있다. In this study, we have researched NASICON type, lithium aluminum silicon titanium phosphate, (LASTP) synthesized by solution-based method. NH₄H₂PO₄, TiO₂, Al(NO₃)₃9H₂O, SiO₂ and LiCl were mixed into deionized water under stirring. The microstructure of the powder and pellet were characterized using a field-emission scanning electron microscope (FE-SEM). The crystal structure was characterized by x-ray diffraction (XRD). The XRD patterns of the LASTP powders were very closed to those of JCPDS data. The ionic conductivity of the synthesized LASTP pellet was 4.0×10<SUP>-4</SUP> S㎝<SUP>-1</SUP>. Therefore, the LASTP electrolyte could be a promising material for solid state batteries.