Efficient Li-ion transport in anode materials is paramount for electric vehicles (EVs) and energy storage systems. The rapid charging demands of EVs can lead capacity decay at high charging rate. To overcome this challenge, we focus on graphite geometric characteristics that effect to interparticle space. We interpret the correlation between the utilization of the electrode and the interparticle space where solvated Li-ion transports in liquid electrolyte. To introduce variability into this space, two main coke precursors, coal cokes and petroleum cokes, were prepared and further categorized as normal cokes and needle cokes. Manufactured graphite samples were observed with distinct geometric characteristics. In this study, investigates the impact of these geometric variations on electrochemical performance, emphasizing rate capability and cycle stability during fast charging. By analyzing the transport properties of electrochemical species within these graphite samples, we reveal the critical role of morphology in mitigating concentration polarization and side reaction, such as Li-plating. These findings offer promising contribution for the development of advanced anode materials, in fast-charging condition in Li-ion.

촉진수송막이란 특정기체의 이동을 촉진시키기 위한 운반체를 포함하고 있는 분리막을 말하며 일반적으로 올레핀/파라핀 분리에는 π-complexation을 할 수 있는 은이온이 운반체로 사용된다. 본 연구에서는 올레핀/파라핀 분리를 위해 은이온이 함침된 아민계 고분자를 이용하여 촉진수송막을 제조하였고 이들의 프로필렌/프로판 분리특성을 알아보았다. 순수가스 테스트를 통해 압력변화에 따른 투과도와 선택도를 구하였으며, 혼합가스 테스트를 통해 stage-cut에 따른 투과측 프로필렌 농도 및 회수율 변화를 알아보았다. 그 결과, 2bar, 25°C에서 95%의 프로필렌을 99.6%까지 농축 시킬 수 있음을 확인하였다.

본 논문에서는 전기화학발광 소재로 널리 이용되는 Ruthenium 착화합물을 함유한 전기화학발광 소자의 활 성층 제작시, 인쇄성 및 공정성을 향상시키기 위해 Poly(methyl methacrylate) (PMMA)를 첨가하였을 때, PMMA의 함유량이 전기화학발광소자의 발광층 내 이온들의 이동 현상에 미치는 영향에 대하여 살펴보았다. 이를 위해, Ruthenium 착화합물과 이온성 액체가 9:1 비율로 섞인 용질이 Acetonitrile에 20 mg/ml 농도로 녹여진 용액과 Dichloromethane에 PMMA가 25 mg/ml의 농도로 용해된 용액을 세 가지 (10:0.14, 10:1 그리고, 10:3) 중량비로 섞어 서 준비한 용액으로부터 발광층을 형성하여 전기화학발광소자를 제작하고, 소자의 전기적 특성을 평가하였다. 그 결 과, 발광층 내의 PMMA 함유량이 증가할수록 Ruthenium 착화합물 기반 전기화학발광소자의 구동 전압은 점차 증가 하였고, PMMA의 양이 줄어들면 순방향 전압하의 전류와 역방향 전압하의 전류 차에 따라 나타나는 이력곡선 (hysteresis)이 점차 사라지는 것을 확인할 수 있었다.

Reverse electrodialysis (RED) is green energy technologies to produce electric power using the salinity gradient. The salinity gradient generates chemical potential difference by transport of ions through the membranes. In RED system, anion exchange membrane (AEM) and cation exchange membrane (CEM) play a major role in transporting cation (Na+) and anion (Cl-), respectively. Significant technical issue is how to enhance conductivity and permselectivity of membrane simultaneously in the system. In this study, we characterized influences of cationic functional groups on AEM. We evaluated conductivity and permselectivity of AEM introduced three types of cationic salt functional groups.

A new ion transport code for planetary ionospheric studies has been developed with consideration of velocity differences among ion species involving ion-ion collision. Most of previous planetary ionosphere models assumed that ions diffuse through non-moving ion and neutral background in order to consolidate continuity and momentum equations for ions into a simple set of diffusion equations. The simplification may result in unreliable density profiles of ions at high altitudes where ion velocities are fast and their velocity differences are significant enough to cause inaccuracy when computing ion-ion collision. A new code solves explicitly one-dimensional continuity and momentum equations for ion densities and velocities by utilizing divided Jacobian matrices in matrix inversion necessary to the Newton iteration procedure. The code has been applied to Martian nightside ionosphere models, as an example computation. The computed density profiles of O+, OH+, and HCO+ differ by more than a factor of 2 at altitudes higher than 200 km from a simple diffusion model, whereas the density profile of the dominant ion, O2+, changes little. Especially, the density profile of HCO+ is reduced by a factor of about 10 and its peak altitude is lowered by about 40 km relative to a simple diffusion model in which HCO+ ions are assumed to diffuse through non-moving ion background, O2+. The computed effects of the new code on the Martian nightside models are explained readily in terms of ion velocities that were solved together with ion densities, which were not available from diffusion models. The new code should thus be expected as a significantly improved tool for planetary ionosphere modelling.