Joohyung Kim

Abstract Sodium ion batteries (NIBs) have become attractive promising alternatives to lithium ion batteries in a broad field of future energy storage applications. The development of high‐performance anode materials has become an essential factor and a great challenge toward satisfying the requirements for NIBs, advancement. This work is the first report on GeS 2 nanocomposites uniformly distributed on reduced graphene oxide (rGO) as promising anode materials for NIBs prepared via a facile hydro

Abstract To date, the possible depletion of lithium resources has become relevant, giving rise to the interest in Na‐ion batteries (NIBs) as promising alternatives to Li‐ion batteries. While extensive investigations have examined various transition metal oxides and chalcogenides as anode materials for NIBs, few of these have been able to utilize their high specific capacity in sodium‐based systems because of their irreversibility in a charge/discharge process. Here, the mixed Sn–S nanocomposites

Rechargeable lithium-ion batteries (LIBs) have been rapidly expanding from IT based applications to uses in electric vehicles (EVs), smart grids, and energy storage systems (ESSs), all of which require low cost, high energy density and high power density.The increasing demand for LIBs has resulted in increasing price of the lithium source, which is a major obstacle to wider application.To date, the possible depletion of lithium resources has become relevant, giving rise to the interest in Na-ion

Abstract The exploitation of state‐of‐the‐art Pt/C electrocatalysts for polymer electrolyte membrane fuel cells (PEMFCs) is mostly limited, due to high Pt loading and durability issues caused by electrochemical instability of the carbon support in high potential regimes. In this study, the authors report that high‐compressive 3D Pt nanostructured thin films can considerably increase the catalytic activity and electrochemical durability of electrocatalysts under PEMFC device operating conditions.

The layered δ‐MnO 2 (dMO) is an excellent cathode material for rechargeable aqueous zinc‐ion batteries owing to its large interlayer distance (~0.7 nm), high capacity, and low cost; however, such cathodes suffer from structural degradation during the long‐term cycling process, leading to capacity fading. In this study, a Co‐doped dMO composite with reduced graphene oxide (GC‐dMO) is developed using a simple cost‐effective hydrothermal method. The degree of disorderness increases owing to the het

Lithium-sulfur (Li−S) batteries are attracting significant research attention because of their high theoretical energy density (2500 Wh kg−1) and excellent economic feasibility. However, commercialization has proven difficult owing to their low electronic conductivity and the dissolution of lithium polysulfide (Li2Sx; x=1–8). In particular, lithium polysulfide dissolution is known to be caused by high-order polysulfide generated at the start of the discharge process. Thus, the control of this fa

High Resolution Image Download MS PowerPoint Slide Li–S batteries have received significant attention owing to their high energy density, nontoxicity, low cost, and eco-friendliness. However, the dissolution of lithium polysulfide during the charge/discharge process and its extremely low electron conductivity hinder practical applications of Li–S batteries. Herein, we report a sulfur-infiltrated carbon cathode material with a spherical morphology and conductive polymer coating. The material was

Abstract Aqueous Zn‐ion batteries (AZIBs) are promising energy‐storage devices owing to their exceptional safety, long cycle life, simple production, and high storage capacity. Manganese oxides are considered potential cathode materials for AZIBs, primarily because of their safety, low cost, simple synthesis, and high storage capacity. However, MnO 2 ‐based cathodes tend to deteriorate structurally during long‐term cycling, which reduces their reversible capacity. In this study, an advanced α‐Mn