Changshin Jo

In order to achieve high-power and -energy anodes operating above 1.0 V (vs Li/Li + ), titanium-based materials have been investigated for a long time. However, theoretically low lithium charge capacities of titanium-anodes have required new types of high-capacity anode materials. As a candidate, TiNb 2 O 7 has attracted much attention due to the high theoretical capacity of 387.6 mA h g –1 . However, the high formation temperature of the TiNb 2 O 7 phase resulted in large-sized TiNb 2 O 7 cryst

Abstract An ordered mesoporous tungsten‐oxide/carbon (denoted as m‐WO 3− x ‐C‐s) nanocomposite is synthesized using a simple one‐pot method using polystyrene‐ block ‐poly(ethylene oxide) (PS‐ b ‐PEO) as a structure‐directing agent. The hydrophilic PEO block interacts with the carbon and tungsten precursors (resol polymer and WCl 6 ), and the PS block is converted to pores after heating at 700 °C under a nitrogen flow. The m‐WO 3− x ‐C‐s nanocomposite has a high Brunauer–Emmett–Teller (BET) surfa

Lithium metal batteries are considered "rough diamonds" in electrochemical energy storage systems. Li-metal anodes have the versatile advantages of high theoretical capacity, low density, and low reaction potential, making them feasible candidates for next-generation battery applications. However, unsolved problems, such as dendritic growths, high reactivity of Li-metal, low Coulombic efficiency, and safety hazards, still exist and hamper the improvement of cell performance and reliability. The

Herein, a pseudocapacitive charging behavior of highly conductive ordered mesoporous tungsten oxide (m-WO 3-X ) is investigated. For this purpose, various electrochemical analysis methods such as cyclic voltammetry (CV), galvanostatic charge–discharge experiment and electrochemical impedance spectroscopy (EIS) were employed. From CV experiment, a relationship analysis between voltammetric charge and scan rate resulted in total (67 C g –1 ), outer (61 C g –1 ) and inner charge (6 C g –1 ), which

This review comprehensively summarizes the key challenges of sodium metal anodes and the recent progress in engineering the SEI layer for high energy density SMBs.

Porous architectures play an important role in various applications of inorganic materials. Several attempts to develop mesoporous materials with controlled macrostructures have been reported, but they usually require complicated multiple-step procedures, which limits their versatility and suitability for mass production. Here, a simple approach for controlling the macrostructures of mesoporous materials, without templates for the macropores, is reported. The controlled solvent evaporation induc

Abstract Owing to the demand for low‐cost batteries with safety, Na‐seawater batteries (SWBs) have received considerable attention as a new energy storage system (ESS). In SWB, it is necessary to use an advanced oxygen evolution/reduction reaction (OER/ORR) catalyst for high energy efficiency (EE) in the cathode and a good sodium storage material for a highly reversible capacity in the anode part. In this study, nanostructured and N and P dual‐doped hard carbon is fabricated by simply carbonizin

The development of better Li-ion battery (LIB) electrodes requires an orchestrated effort to improve the active materials as well as the electron and ion transport in the electrode. In this paper, iron silicide is studied as an anode material for LIBs because of its higher conductivity and lower volume expansion compared to pure Si particles. In addition, carbon nanotubes (CNTs) can be synthesized from the surface of iron-silicides using a continuous flow coating process where precursors are fir

F-free, cost-effective 1 M NaBH 4 /glyme electrolytes induce SEI reconstruction, which converts the native oxide layer on sodium metal to a NaH-based SEI layer. With 1 M NaBH 4 /DEGDME, we achieved long-term cycling, high-power seawater batteries.

Ordered meso- or macro-porous carbons (OMCs) were applied as anodes in Na ion battery (NIB) systems. Three different block copolymers (BCPs) enabled us to control the pore sizes (6, 33, and 60 nm) while maintaining the same 2-D hexagonal structure. To exclude other effects, the factors including precursors, particle sizes, and degrees of graphitization were controlled. The structures of OMCs were characterized by nitrogen physisorption, Raman spectroscopy, X-ray analyses (XRD and SAXS), and micr

Lithium (Li) metal is a promising anode material for next-generation batteries because of its low standard reduction potential (-3.04 V vs. SHE) and high specific capacity (3860 mA h g-1). However, it is still challenging to directly use Li metal as anode material in commercial batteries because of unstable Li dendrite formation and accumulated solid-electrolyte interphase. Possible methods that can suppress the unwanted formation of Li dendrites are (i) by increasing the electrode surface area

Various mesoporous materials synthesized from block copolymer soft-template-assisted methods and their application in energy storage systems.

Ordered mesoporous carbons (OMCs) are promising materials for cathode materials of a Zn ion hybrid capacitor (Zn HC) due to their high surface area and interconnected porous structure. Graphitization of the framework and nitrogen doping have been used to improve the energy storage performance of the OMCs by enhancing electrical conductivity, pseudocapacitive reaction sites, and surface affinity toward aqueous electrolytes. Thus, when both methods are simultaneously implemented to the OMCs, the Z