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김천식(C. S. Kim),곽동걸(D. G. Kwak),전중함(J. H. Chun),서기영(K. Y. Suh),이현우(H. W. Lee) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
This paper is proposed a sinusoidal input current multi-level ac-dc converter using transformer. The multi-level converter which controls input current by combining Buck converter to improve input current characteristics<br/> This method, which is multiplying and duplicating output of converter of equal capacity, is able to control unit power factor of input current, reduce the problem caused by high frequency switching, and apply to high power converter because filter is not necessary<br/> The feasibility of the circuit is verified by computer simulation using PS1M.
J. Seo(서주현),J. Y. Lee(이진영),S. Hyun(현승민),J. Moon(문준희),C. Kim(김천중) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
In this work, we coat polydopamine (PD) on the surface of graphite particles (G-PD), thereby improving the rate capability and cyclability of the graphite anode by 50 and 17%, respectively. The PD layer was coated on the powder scale through a wet coating method, which showed better battery performance than earlier studies. We investigated the two different coating methods, which are the electrode-scale and powder-scale coating methods. Furthermore, we studied the battery performance of the graphite anode with various PD coating times and confirmed that optimal current density exists for high power. PD worked as the artificial SEI layer, thus preventing direct contact between electrolytes and graphite surfaces while forming an ion-conducting path for Li-ions. Moreover, the G-PD electrode showed higher capacity retention and lower resistance compared to graphite due to the improved stability of the PD artificial SEI layer. The PD was very effective even though it was coated with nanometer thickness on the surface of graphite particles.