Seung-Tae Hong

DGIST (Daegu Gyeongbuk Institute of Science and Technology) · Energy Science and Engineering

Sulfide inorganic materials exhibit favorable qualities such as high ionic conductivity and mechanical softness, making them promising candidates for solid electrolytes in Li-ion all-solid-state batteries. Sulfide solid electrolytes exist in various structural types, including β-Li 3 PS 4 , Li 10 GeP 2 S 12 , argyrodite, Li 4 PS 4 I, Li 7 P 3 S 11...

Magnesium-ion batteries (MIBs) have emerged as a promising candidate for post-lithium-ion batteries. However, their widespread adoption is hindered by the limited number of host materials that can intercalate magnesium ions reversibly in a nonaqueous electrolyte with a high operating voltage, such as Prussian Blue analogues. Unfortunately, the capa...

Calcium-ion battery (CIB) is considered one of the attractive candidates for post-Li-ion batteries. However, few cathode materials intercalate Ca ions reversibly in nonaqueous electrolytes. Herein, we report the discovery of novel ammonium vanadium bronze (NVO) as a host material of CIBs. We synthesized NVO via a facile hydrothermal method. We dete...

Magnesium batteries have emerged as a promising alternative to lithium‐ion batteries due to their theoretical high energy density and abundant magnesium resources. Vanadium dioxide, VO2(B), has been reported as a high‐capacity cathode material for magnesium batteries. However, the electrochemical intercalation mechanism requires further elucidation...

Solid-state potassium batteries are promising energy storage systems, but their wide use requires suitable solid electrolytes to ensure high ionic conductivity, electrochemical stability, and contacting ability with composite electrodes. For this purpose, this study introduces sulfone-based crystalline organic electrolytes (SCOEs) consisting of dim...

Solid-state potassium batteries are promising energy storage systems, but their wide use requires suitable solid electrolytes to ensure high ionic conductivity, electrochemical stability, and contacting ability with composite electrodes. For this purpose, this study introduces sulfone-based crystalline organic electrolytes (SCOEs) consisting of dim...

Calcium-ion batteries (CIBs) are among the promising alternatives to overcome the limitation of lithium-ion batteries in current use. Compared with lithium, calcium is environmentally friendly, reliable, safe, and abundant in resources. Despite the development of intercalation-type cathode materials for CIBs in its infancy, the number of newly disc...

Electrode alignment is one of design parameters that must be carefully controlled for reliable full cells with limited lithium ion inventory. Especially because punched disk-type cathodes and anodes are movable during assembling coin-type cells, the misalignment of electrodes cannot be completely prevented. This misalignment is not only mixed with...

Calcium-ion batteries represent a promising alternative to the current lithium-ion batteries. Nevertheless, calcium-ion intercalating materials in nonaqueous electrolytes are scarce, probably due to the difficulties in finding suitable host materials. Considering that research into calcium-ion batteries is in its infancy, discovering and characteri...

Solid oxide cells (SOCs) have been reported as promising energy production and storage devices due to their high efficiency and low pollutant emissions. A key barrier to achieve high performance of SOCs is high electrode polarization resistance which attributes to the sluggish kinetics of oxygen reduction reactions (ORRs) and oxygen evolution react...

Two newly emerging materials for application in all‐solid‐state batteries, namely, single‐crystalline Ni‐rich layered oxide cathode and halide solid electrolyte (SE), are of utmost interest because of their superior properties (good microstructural integrity and excellent electrochemical oxidation stability, respectively) to conventional polycrysta...

Owing to their mitigated safety risk and high energy density, all-solid-state sodium batteries are promising post-Li batteries. However, current solid-state electrolytes have insufficient ionic conductivity, electrochemical stability, and contacting ability with porous electrodes. To overcome these issues, this study presents sulfone-based crystall...

In article number 2003190, Kyung‐Wan Nam, Yoon Seok Jung and co‐workers develop a new halide solid electrolyte, Fe³⁺‐substituted Li2ZrCl6, that is mechanically sinterable, (electro)chemical‐oxidation tolerant, and free of rare‐earth metals. The outstanding performance of the all‐solid‐state batteries using LiCoO2 and LiNi0.88Co0.11Al0.01O2 is enabl...

Halide solid electrolytes (SEs) are emerging as an alternative to sulfide and/or oxide SEs for applications in all-solid-state batteries owing to the advantage fulfilling high (electro)chemical stability and mechanical sinterability at the same time. Thus far, the developments in halide SEs have focused on Li⁺ superionic conductors. Herein, the dev...

Reversible solid oxide cells (SOCs) are unique devices that perform interconversion between chemical energy (particularly, hydrogen) and electricity, providing efficient energy storage for site-specific and weather-dependent solar and wind resources. One of the key requirements for achieving high-performance reversible SOCs is the development of hi...

Owing to the combined advantages of sulfide and oxide solid electrolytes (SEs), that is, mechanical sinterability and excellent (electro)chemical stability, recently emerging halide SEs such as Li3YCl6 are considered to be a game changer for the development of all‐solid‐state batteries. However, the use of expensive central metals hinders their pra...

Calcium-ion batteries (CIBs) are getting increasing attention as post-lithium-ion batteries owing to their theoretical and potential advantages in terms of energy density and cost-effectiveness. However, most of the reported cathode...

Calcium-ion batteries (CIBs) represent a promising alternative to the current lithium-ion batteries (LIBs). Calcium ions can transfer two electrons per ion. Thus, in principle, the capacity of a host material can double due to the divalency of calcium, provided the host material can release and accept the transferred electrons. The final battery pr...

Various types of sodium manganese oxides are promising cathode materials for sodium storage systems. One of the most considerable advantages of this family of materials is their widespread natural abundance. So far, only a few host candidates have been reported and there is a need to develop new materials with improved practical electrochemical per...

Calcium-ion batteries (CIBs) are gaining increasing attention due to their theoretically high capacity, owing to the divalency of calcium, and low cost. However, only a few calcium insertion electrode materials are reported, and most of them exhibit low capacity or poor cyclability in nonaqueous electrolytes. Herein, we demonstrated high-performanc...

Li-ion batteries (LIBs) have been the most prevailing rechargeable batteries for the last three decades. However, the present LIBs have energy densities close to the theoretical limits, and the Li resources are scarce. Calcium-ion batteries (CIBs) are one of the promising candidates to overcome such limitations of LIBs. The divalency of calcium as...

Tunnel‐type sodium manganese oxide is a promising cathode material for aqueous/nonaqueous sodium‐ion batteries, however its storage mechanism is not fully understood, in part due to the complicated sodium intercalation process. In addition, low cyclability due to manganese dissolution has limited its practical application in rechargeable batteries....

A new type of ammonium vanadium bronze, (NH4)2V7O16, was synthesized by the hydrothermal method. The triclinic crystal structure (P1̅) is successfully identified by the single-crystal X-ray diffraction method. The layered structure is similar to that of other vanadium bronzes but with an unprecedented stoichiometry and crystal structure. The struct...

Electrochemical calcium intercalation into double-sheet vanadium oxide: Upon discharge, calcium ions are inserted into the double-sheet V2O5 structure. Upon charge, a reverse reaction occurs. The calcium ion-storage mechanism is a combination of bulk intercalation and surface capacitance reactions. Abstract Calcium-ion batteries (CIBs) are theoret...

The 1,8-naphthalimide (NI) derivative Lumogen F Violet 570 exhibits different photoluminescence (PL) and aggregation-caused quenching properties due to its crystal polymorphism, which depends on the solvent evaporation process in tetrahydrofuran solution. In the slow drying process, molecules aggregated into an energetically more stable form (time-...

Potassium‐ion batteries (KIBs) are one of the potential candidates for large‐scale energy storage devices with low cost due to the abundance of potassium resources. However, the development of cathode materials with high capacity and structural stability has been a challenge due to the difficulties of intercalation of the large size of K‐ions into...

Calcium-ion batteries (CIBs) are one of the promising candidates for post-lithium-ion batteries. However, only a few types of host materials are known to intercalate calcium ions reversibly in a nonaqueous electrolyte. Here, we demonstrate the electrochemical performances and evidence of calcium-ion intercalation into iron vanadate, FeV 3 O 9 ∙xH 2...

Sluggish reaction kinetics on oxygen electrodes at reduced temperatures (< 750 oC) remain a major challenge for the technical progress of reversible solid oxide cells (SOCs). To overcome this issue, the development of highly active and stable oxygen electrodes at intermediate temperatures (ITs, < 750 oC) is urgent and essential. Rare earth-stabiliz...

The crystal structure of strontium perchlorate anhydrate, Sr(ClO 4 ) 2 , was determined and refined from laboratory powder X-ray diffraction data. The material was obtained by dehydration of Sr(ClO 4 ) 2 ·3H 2 O at 523 K for two weeks. It crystallizes in the orthorhombic space group Pbca and is isotypic with Ca(AlD 4 ) 2 and Ca(ClO 4 ) 2 . The asym...

Rhombohedral potassium-zinc hexacyanoferrate K1.88Zn2.88[Fe(CN)6]2(H2O)5 (KZnHCF) synthesized using a precipitation method is demonstrated as a high-voltage cathode material for potassium-ion batteries (PIBs), exhibiting an initial discharge capacity of 55.6 mAh g-1 with a discharge voltage of 3.9 V versus K/K+ and a capacity retention of ∼95% afte...

VOPO4⋅2 H2O is demonstrated as a cathode material for potassium‐ion batteries in 0.6 m KPF6 in ethylene carbonate/diethyl carbonate, and its distinct exchange reaction mechanism between potassium and crystal water is reported. In an anhydrous electrolyte, the cathode shows an initial capacity of approximately 90 mAh g⁻¹, with poor capacity retentio...

Layered perovskite SrGdNixMn1-xO4±δ phases were evaluated as new ceramic anode materials for use in solid oxide fuel cells (SOFCs). Hydrogen temperature programmed reduction (H2-TPR) analysis of the SrGdNixMn1-xO4±δ (x=0.2, 0.5, and 0.8) materials revealed that significant exsolution of Ni nanoparticles occurred in SrGdNi0.2Mn0.8O4±δ (SGNM28) in H2...

Zinc-ion batteries (ZIBs) have received attention as one type of multivalent-ion batteries due to their potential applications in large-scale energy storage systems. Here we report a prototype of rocking-chair ZIB system employing Zn2Mo6S8 (zinc Chevrel phase) as an anode operating at 0.35 V, and K0.02(H2O)0.22Zn2.94[Fe(CN)6]2 (rhombohedral zinc Pr...

Most electrolytes for rechargeable Mg batteries require time-consuming conditioning or pre-cycling process to achieve fully reversible Mg deposition/dissolution, which hinders the normal operation of Mg batteries. This study details a simple and effective method for eliminating this conditioning behavior using heptamethyldisilazane (HpMS) as an ele...

Mechanically sinterable sulfide Na+ superionic conductors are key to enabling room-temperature-operable all-solid-state Na-ion batteries (ASNBs) for large-scale energy storage applications. To date, few candidates can fulfill the requirement of a high ionic conductivity of 1 mS cm-1 using abundant, cost-effective, and non-toxic elements. Herein, t...

Monoclinic Fe2(MoO4)3 undergoes a single-phase reaction in a Na-ion cell, but a two-phase reaction in a Li-ion cell. We solved the crystal structure of Na2Fe2(MoO4)3 for the first time using ab initio structure determination from powder diffraction data. The ionic size of a guest ion and the coordination nature of the cavity in a host structure are...

Calcium-ion intercalation-based batteries receive attention as one type of post lithium-ion battery because of their potential advantages in terms of cost and capacity. A birnessite-type manganese oxide, K0.31MnO2·0.25H2O, is characterized by a layered structure with interlayer distances of ∼7 Å. Here, we demonstrate for the first time the electroc...

Magnesium-ion batteries (MIBs) offer improved safety, lower cost, and higher energy capacity. However, lack of cathode materials with considerable capacities in conventional nonaqueous electrolyte at ambient temperature is one of the great challenges for their practical applications. Here, we present high magnesium-ion storage performance and evide...

The crystal structure of calcium perchlorate anhydrate was determined from laboratory X-ray powder diffraction data. The title compound was obtained by heating hydrated calcium perchlorate [Ca(ClO 4 ) 2 · x H 2 O] at 623 K in air for 12 h. It crystallizes in the orthorhombic space group Pbca and is isotypic with Ca(AlD 4 ) 2 . The asymmetric unit c...

In this study, we developed a doping technology capable of improving the electrochemical performance, including the rate capability and cycling stability, of P2-type Na0.67Fe0.5Mn0.5O2 as a cathode material for sodium-ion batteries. Our approach involved using titanium as a doping element to partly substitute either Fe or Mn in Na0.67Fe0.5Mn0.5O2....

Sulfide Na-ion solid electrolytes (SEs) are key to enable room-temperature operable all-solid-state Na-ion batteries that are attractive for large-scale energy storage applications. To date, few sulfide Na-ion SEs have been developed and most of the SEs developed contain P and suffer from poor chemical stability. Herein, discovery of a new structur...

The magnesium insertion capability of Prussian blue (PB) analogue, potassium nickel hexacyanoferrate K0.86Ni[Fe(CN)6]0.954(H2O)0.766 (KNF-086), is demonstrated as a cathode material for rechargeable magnesium-ion batteries using a conventional organic electrolyte. K1.51Ni[Fe(CN)6]0.954(H2O)0.766 is synthesized first, and potassium ions are electroc...

Magnesium batteries have received attention as a type of post lithium-ion battery because of their potential advantages in cost and capacity. Among the host candidates for magnesium batteries, orthorhombic α­-V 2 O 5 is one of the most studied materials. The enhanced electrochemical activity of Mg intercalation into α-V 2 O 5 in a wet organic elect...

The electrochemical lithium-ion intercalation properties of molybdenum metal-cluster oxide LixMo4O6 (0.33 ≤ x ≤ 1.0) in an organic electrolyte of 1.0 M LiPF6 in ethylene carbonate/dimethyl carbonate (1:2 v/v) were characterized for the first time. Li0.66Mo4O6 (tetragonal, P4/mbm, a = 9.5914(3) Å, c = 2.8798(1) Å, V = 264.927(15) ų, Z = 2) was prep...

Magnesium batteries have received attention as a type of post-lithium-ion battery because of their potential advantages in cost and capacity. Among the host candidates for magnesium batteries, orthorhombic α-V2O5 is one of the most studied materials, and it shows a reversible magnesium intercalation with a high capacity especially in a wet organic...

A major challenge for developing rechargeable Mg batteries is the lack of suitable electrolytes. We report herein dialkyl sulfones as non-Grignard and Lewis acid-free Mg electrolytes. In particular, a dipropyl sulfone (DPSO)/tetrahydrofuran (THF) (1/1, v/v) solution with MgCl2 salt exhibits high ionic conductivity (1.1 mS cm⁻¹ at 30 °C), Mg cycling...

This study demonstrates an organic electrolyte-based rechargeable zinc-ion battery (ZIB) using Prussian blue (PB) analogue potassium nickel hexacyanoferrate K0.86Ni[Fe(CN)6]0.954(H2O)0.766 (KNF-086) as the cathode material. KNF-086 is prepared via electrochemical extraction of potassium ions from K1.51Ni[Fe(CN)6]0.954(H2O)0.766 (KNF-151). The cell...

Rechargeable sodium-ion batteries (NIBs) have been considered as promising candidates for alternatives to lithium-ion batteries due to the low cost and abundance of sodium. Recently, Fe 2 (MoO 4 ) 3 has received an attention as a positive electrode material for NIBs. ¹⁻⁴ There are two polymorphic phases for Fe 2 (MoO 4 ) 3 : the low-temperature mon...

Recently, calcium-ion batteries (CIBs) have received attention as a candidate for next generation batteries due to slight difference of standard reduction potential about 0.17 V above that of lithium and relative abundance of calcium compared to lithium. ¹ It is known that the birnessite-type manganese oxide, characterized by a layered structure co...

The rechargeable zinc-ion batteries have received attention as candidates for large-scale energy storage systems, being expected to give high performances in terms of the cost effectiveness due to the abundance of the elements, the safety, the energy density and the environmental friendliness.[1, 2] However, zinc metal has serious dendrite problems...

Recently, rechargeable batteries have been emerging as the key to large-scale energy storage devices. For electric vehicles (EVs), lithium-ion batteries (LIBs) are considered to be the most competitive because of their high operating voltage and light weight of electrode materials. For larger-scale applications than electric vehicles, energy grid o...

Calcium-based battery is a very attractive alternative to Li-ion batteries due to theabundance of calcium. The hewettite (CaV 6 O 16 ·xH 2 O) has recevied an attention due to its typical two-dimensional layered structure consisting of V 3 O 8 layers and the hydrated calcium ions occupied between those layers (Fig1.a). The hewettite was known to be...

Complex formation between lithium (Li(+)) ions and electrolyte molecules would affect the ionic conductivity through the electrolyte in lithium-ion batteries (LIBs). We hence revisit the solvation number of Li(+) in the most commonly used ethylene carbonate (EC) electrolyte. The solvation number n of Li(+)(EC)n in the first solvation shell of Li(+)...

All-solid-state sodium-ion batteries that operate at room temperature are attractive candidates for use in large-scale energy storage systems. However, materials innovation in solid electrolytes is imperative to fulfill multiple requirements, including high conductivity, functional synthesis protocols for achieving intimate ionic contact with activ...

All-solid-state sodium-ion batteries that operate at room temperature are attractive candidates for use in large-scale energy storage systems. However, materials innovation in solid electrolytes is imperative to fulfill multiple requirements, including high conductivity, functional synthesis protocols for achieving intimate ionic contact with activ...

The title phases are prepared by electrochemical Zn2+ ion intercalation into Mo6S8 in ZnSO4 solution.

Disclosed is a cathode mix for secondary batteries, comprising lithium iron phosphate, coated with carbon (C), having an olivine crystal structure that contains a compound represented by the following formula 1 as a cathode active material, wherein a mean particle diameter of primary particles in the cathode active material is 2 μm or less, and the...

The previously unknown crystal structure of barium perchlorate anhydrate, determined and refined from laboratory X-ray powder diffraction data, represents a new structure type. The title compound was obtained by heating hydrated barium perchlorate [Ba(ClO 4 ) 2 · x H 2 O] at 423 K in vacuo for 6 h. It crystallizes in the orthorhombic space group Fd...

In the structure of the title salt, [Co(C6H6N2)2(H2O)2](BF4)2, the CoII atom is located on an inversion centre. The transition metal is in a slightly distorted octa­hedral coordination environment, defined by the cyano N atoms of four hex-3-enedi­nitrile ligands in equatorial positions and the O atoms of two water mol­ecules in axial positions. The...

Disclosed is an integrated electrode assembly having a structure in which a cathode, an anode, and a separation layer disposed between the cathode and the anode are integrated with one another, wherein the separation layer has a multilayer structure including at least one two-phase electrolyte including a liquid phase component and a polymer matrix...

Disclosed are a novel compound, a method for preparing the same, and a lithium secondary battery comprising the same. More specifically, disclosed are a compound in which five MO6 octahedrons are bonded to one another around one MO6 octahedron such that the MO6 octahedrons share a vertex, to form hollows and Li cations substituted instead of Na cat...

Disclosed is a cathode active material comprising a lithium-free metal oxide and a material with high irreversible capacity. A novel lithium ion battery system using the cathode active material is also disclosed. The battery, comprising a cathode using a mixture of a Li-free metal oxide and a material with high irreversible capacity, and an anode c...

Disclosed is a lithium secondary battery, which is low in capacity loss after overdischarge, having excellent capacity restorability after overdischarge and shows an effect of preventing a battery from swelling at a high temperature.

Disclosed is an anode active material including: a crystalline phase comprising Si and a Si-metal alloy; and an amorphous phase comprising Si and a Si-metal alloy, wherein the metal of the Si-metal alloy of the crystalline phase is the same as or different from the metal of the Si-metal alloy of the amorphous phase.

Thermoelectric conversion materials, expressed by the following formula: Bi1-xMxCuwOa-yQ1yTeb-zQ2z. Here, M is at least one element selected from the group consisting of Ba, Sr, Ca, Mg, Cs, K, Na, Cd, Hg, Sn, Pb, Mn, Ga, In, Tl, As and Sb; Q1 and Q2 are at least one element selected from the group consisting of S, Se, As and Sb; x, y, z, w, a, and...

A new material, LiRu2O4, has been synthesized by ion-exchange reaction from NaRu2O4 that has been prepared by solid state reaction at 950 °C under Ar flow. The crystal structure of LiRu2O4, isostructural with the parent NaRu2O4, has been refined by an X-ray Rietveld method (Pnma, a = 9.13940(5) Å, b = 2.80070(9) Å, c = 11.0017(1) Å, Z = 4, Rp = 5.3...

This paper represents the first description of the electrochemical sodium ion intercalation properties of Na2.7Ru4O9 in both nonaqueous and aqueous electrolytes. Na2.7Ru4O9 was synthesized at 700-850 degrees C by solid-state reaction under Ar flow. It has single, double and triple chains of edge-sharing RuO6 octahedra and one-dimensional tunnels be...

Provided is a transition metal precursor comprising a composite transition metal compound represented by Formula I, as a transition metal precursor used in the preparation of a lithium-transition metal composite oxide: M(OH1−x)2 (1) wherein M is two or more selected from the group consisting of Ni, Co, Mn, Al, Cu, Fe, Mg, B, Cr and transition met...

The previously unknown crystal structure of magnesium perchlorate anhydrate, determined and refined from laboratory X-ray powder diffraction data, represents a new structure type. The title compound was obtained by heating magnesium perchlorate hexahydrate at 523 K for 2 h under vacuum and it crystallizes in the monoclinic space group P2(1)/c. The...

The title compound is synthesized by solid state reaction of SrCO3, MgO, and (NH4)2HPO4 (air, 1303 K, 4 h and 1323 K, 4 h, 90% yield) and its structure is determined by powder XRD.

The previously unknown crystal structure of strontium magnesium phosphate, Sr(2+x)Mg(3-x)P(4)O(15) (x ~ 0.36), determined and refined from laboratory powder X-ray diffraction data, represents a new structure type. The title compound was synthesized by high-temperature solid-state reaction and it crystallizes in the orthorhombic space group Cmcm. It...

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.