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Maldonado Nogales, Paul,Song, Hee-Youb,Jeong, Soon-Ki Hindawi Limited 2018 Journal of nanomaterials Vol.2018 No.-
<P>The electrochemical performance of negative electrodes based on different FeS2 samples was investigated. The study demonstrated a correlation between the coulombic efficiency obtained over 60 cycles and the capacity loss rate evaluated over 15 cycles. The accuracy of the coulombic efficiency and capacity loss rate measurements was advantageous for predicting the aging behavior of half-cells over a short-term test. A suggested classification of the coulombic efficiency and verification via a numerical analysis were proposed to determine the fading rate of batteries during the galvanostatic test.</P>
Effect of surface layers produced on lithium metal after heat treatment
( Paul Maldonado Nogales ),정순기 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Decades of research have been dedicated to the development and fundamental understanding of the forces that control the native film of Li metal. The representation and the origin of this film still needs more attention due to the lack of complementary information about natural - guided native film formation at high temperatures. In this study, we identify the nature of surface layers formation on lithium metal foil via the heat treatment process at low levels of moisture and oxygen. The heat treatment enables a guided formation of enriches lithium carbonate layer at native film responsible for the formation of stable solid electrolyte interface (SEI) in contact with electrolyte that simultaneously minimizes the decomposition, penetration of the electrolyte, and reaction with the bulk lithium metal under the surface. This natural formation of native film, and later SEI film, shows protection during the deposition-dissolution against short-circuiting, and stability of lithium metal.
이차전지용 음극 소재로써 CO<sub>2</sub> 처리된 리튬 금속의 전기화학적 특성
김예지,( Maldonado Nogales Paul ),정순기 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
리튬 금속은 3860 mAh g<sup>-1</sup>의 높은 이론 용량과 표준 수소 전극 대비 - 3.045 V의 낮은 산화환원전위를 가지고 있어 유력한 차세대 음극 소재로 주목받고 있다. 그러나 충방전이 반복되면서 리튬 금속 표면에 수지상 리튬이 생성되는 문제가 있다. 수지상 리튬의 성장을 억제하기 위한 한 가지 방법으로 본 그룹에서는 리튬 금속을 열처리하여 피막을 개질하는 방법을 제시하였다. 열처리에 의해 개질된 리튬 금속 피막을 X선 광전자 분광법으로 분석한 결과 리튬 금속 피막에 다량의 Li<sub>2</sub>CO<sub>3</sub>가 생성된 것이 확인되었다. 이러한 결과를 근거로 하여 본 연구에서는 Li<sub>2</sub>CO<sub>3</sub>가 다량 포함된 피막을 형성시키고자 리튬 메탈을 CO<sub>2</sub> 분위기에서 열처리하였고 이를 음극 소재로 하여 전기화학적 특성을 고찰하였다.
Song, Hee-Youb,Kim, Seong In,Nogales, Paul Maldonado,Jeong, Soon-Ki The Korean Electrochemical Society 2019 Journal of electrochemical science and technology Vol.10 No.1
Herein, the effect of counter anions on the formation of a solid electrolyte interphase (SEI) in a propylene carbonate (PC)-based electrolyte solution was investigated. Although the reversible capacities were different, reversible intercalation and de-intercalation of lithium ions occurred in the graphite negative electrode in the PC-based electrolyte solutions containing 1 M $LiClO_4$, $LiPF_6$, $LiBF_4$, and $LiCF_3SO_3$ at low temperature ($-15^{\circ}C$). This indicated that the surface films acted as an effective SEI to suppress further co-intercalation and decomposition reactions at low temperature. However, the SEIs formed at the low temperature were unstable in 1 M $LiPF_6$ and $LiBF_4/PC$ at room temperature ($25^{\circ}C$). On the other hand, increasing reversible capacity was confirmed in the case of $LiCF_3SO_3/PC$ at room temperature, because the SEI formed at the low temperature was still maintained. These results suggest that counter anions are an important factor to consider for the formation of effective SEIs in PC-based electrolyte solutions.