Dong Jun Kim

Organic rechargeable batteries, composed of redox-active molecules, are emerging as candidates for the next generation of energy storage materials because of their large specific capacities, cost effectiveness, and the abundance of organic precursors, when compared with conventional lithium-ion batteries. Although redox-active molecules often display multiple redox states, precise control of a molecule's redox potential, leading to a single output voltage in a battery, remains a fundamental chal

An aqueous sodium ion hybrid battery consisting of disodium naphthalenediimide salt (anode) and KCo0.5Cu0.5Fe(CN)6 (cathode) is reported. Both electrode materials are inexpensive and exhibit appropriate operating voltages and robust reversibility under neutral aqueous electrolyte conditions, delivering a full-cell voltage of 1.1 V with 88% capacity retention after 100 cycles. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such mater

We have demonstrated that even small structural variations on the imide nitrogens of naphthalenediimides bearing identical Li-ion binding sites can cause dramatic effects in the performance of organic rechargeable batteries. In particular, naphthalenedimide dilithium salt showed excellent cycling with a capacity of 130 mA h g−1 at potentials as high as 2.5 V vs. Li/Li+.

A micro hole machined by EDM with a cylindrical electrode has different hole entrance and exit diameters. This taper shape of the micro hole is caused both by tool wear and by eroded particles that induce secondary discharge during hole machining. In this paper, a novel method is proposed to reduce the difference between the entrance and exit diameters of the holes. The effects of feeding depth, applied capacitance and machining time on the formation of the tapered shape were observed experiment

The Li metal is increasingly receiving attention as the ultimate anode material for Li metal batteries on account of its superior capacity and low redox potential. Recent studies have suggested that designing nanostructured hosts is an effective approach for resolving chronic issues of Li metal anodes, such as dendrite growth and dead Li generation. Nevertheless, the scalability of the nanostructured materials has been insufficiently recognized and discussed. Herein, we demonstrate a facile and

The battery safety and cost remain major challenges for developing next-generation rechargeable batteries. All-solid-state sodium (Na)-ion batteries are a promising option for low-cost as well as safe rechargeable batteries by using abundant resources and solid electrolytes. However, the operation of solid-state batteries is limited due to the low ionic conductivity of solid electrolytes. Therefore, it is essential to develop new compounds that feature a high ionic conductivity and chemical stab

Bicarbazole-triazine hybrid type exciplex-forming hosts with a high bond dissociation energy are introduced and successfully applied to realize high-performance blue PhOLEDs with high efficiency and a long operational lifetime.

Along with the widening application and growing market size of energy storage devices, the development of cost-effective rechargeable batteries with a high level of operational safety has become a major challenge. To this end, an all-solid-state battery (ASSB), which is composed of a thin film instead of a liquid, is an attractive candidate. In this study, we investigated a facile method for preparing sodium superionic conductor structured Na1+xZr2SixP3–xO12 (0 ≤ x ≤ 3, NZSP). Various attempts w

A novel way of absorbing sulfur species by a vascular system of lignocellulosic fibers and hollow VO 2 achieved ultrahigh areal capacity, and the extraordinary adsorption behavior was characterized by operando Raman spectroscopy.

AbstractThe purpose of current research is to establish a theoretical size-dependent framework for estimating the amount of thermoelastic damping (TED) in miniaturized rings with circular cross section via the nonlocal dual-phase-lag (NDPL) generalized thermoelasticity theory, as one of the most exhaustive non-Fourier heat conduction models. The method used to achieve this goal is based on the definition of TED in the energy dissipation (ED) approach. To do so, after deriving heat equation in th

A series of triazine-dibenzofuran-based n-type host materials was developed for highly efficient green top-emitting PhOLEDs.